Relevant bibliographies by topics / Thermal barriers (plasma control)

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
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Academic literature on the topic 'Thermal barriers (plasma control)'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Thermal barriers (plasma control)"

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Bernard, Benjamin, Luc Bianchi, André Malié, Aurélien Joulia, and Benjamin Rémy. "Columnar suspension plasma sprayed coating microstructural control for thermal barrier coating application." Journal of the European Ceramic Society 36, no. 4 (March 2016): 1081–89. http://dx.doi.org/10.1016/j.jeurceramsoc.2015.11.018.

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Li, R. M., S. C. Joshi, and H. W. Ng. "Characterization of plasma-sprayed alumina as thermal control coating for micro-satellite applications." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 219, no. 2 (April 1, 2005): 111–19. http://dx.doi.org/10.1243/146442005x10292.

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Conventional thermal control materials (TCMs) used in satellites tend to deteriorate in the severe space environment, many times leading to unanticipated mission problems. New and better TCMs are constantly sought to reduce difficulties in satellite thermal design. In this paper, the possibility of using plasma-sprayed alumina (PSA) coating for thermal control of a satellite is examined. Such PSA coatings have proved to be a good thermal barrier coating material for hot section components in aircraft engines. Panels of aluminum alloys such as 2024-T3, 6061-T6, 7075, and so on which are commonly used for satellite applications, form a very compatible substrate for PSA coatings. Various physical and processing parameters and simulated in-service behaviour for PSA were studied analytically and experimentally. Preliminary investigations reveal that the PSA coatings have good potential as a substitute to conventional TCMs for micro-satellite panels, including solar arrays.
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Balasubramanian, Manjula, Anita Sebastian, Marie Peddinghaus, Gregory Fridman, Alexander Fridman, Alexander Gutsol, Gregory Friedman, and Brooks Ari. "Dielectric Barrier Discharge Plasma in Coagulation and Sterilization." Blood 108, no. 11 (November 16, 2006): 4043. http://dx.doi.org/10.1182/blood.v108.11.4043.4043.

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Abstract Rapid loss of blood, in the operating room or trauma, necessitates a need for hastening coagulation Attempts to hasten coagulation include electrocautery based on thermal plasma discharges. Although there have been other effective attempts to prevent further loss of blood via coagulation, tissue damage and dessication can occur as a result of the high temperatures 2. Our group has developed a method to initiate rapid coagulation with dielectric plasma discharge (cold). Initial experiments were performed using fresh blood from volunteers to compare time for coagulation of whole blood exposed to plasma, one minute versus 10 minutes. We tried same experiments on cut cadaver organs such as spleen and placenta which showed evidence of rapid coagulation compared to control without evidence of tissue damage. Our research team has developed a novel method using non-thermal dielectric barrier discharge plasma (DBD plasma) to coagulate blood and sterilize tissues without causing thermal damage. This treatment would be safe to patients because no exposed electrodes are involved and high frequency current (under 10 KHz) is kept below mili-ampere. Our experiments have shown that such plasma treatment hastens blood coagulation and causes simultaneous wound sterilization via a large concentration of chemically active species in plasma that are ions, radicals (O, OH, N) and electronically-excited atoms and molecules. A kinetic model of blood coagulation under influence of DBD plasma was constructed. The model assumes contact flux of positive ions from DBD plasma into the surface of the blood being treated. Once at the surface, these ions recombine, leading to formation of aqueous Hydrogen ions which catalyze the release of Calcium ions into the blood. The addition of Calcium ions to blood speeds up the coagulation process proportionally to the amount of ions added. The model demonstrates thrombin formation in the presence of DBD plasma peaking and occurring within significantly less time compared to thrombin formation without DBD plasma3. Such medically relevant demonstrations and mathematical explanations have allowed us to develop a portable device that may prove useful in situations where control of bleeding is crucial. In addition, because of the potential for simultaneous sterilization, this device may also help to decrease infections. This pioneering technology will find applicability in many clinical situations: sterilization of human tissue surfaces prior to surgery and sterilization of catheters, a well-known cause of morbidity in hospitals.
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Arjunan, Krishna Priya, Gary Friedman, Alexander Fridman, and Alisa Morss Clyne. "Non-thermal dielectric barrier discharge plasma induces angiogenesis through reactive oxygen species." Journal of The Royal Society Interface 9, no. 66 (June 8, 2011): 147–57. http://dx.doi.org/10.1098/rsif.2011.0220.

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Vascularization plays a key role in processes such as wound healing and tissue engineering. Non-thermal plasma, which primarily produces reactive oxygen species (ROS), has recently emerged as an efficient tool in medical applications including blood coagulation, sterilization and malignant cell apoptosis. Liquids and porcine aortic endothelial cells were treated with a non-thermal dielectric barrier discharge plasma in vitro . Plasma treatment of phosphate-buffered saline (PBS) and serum-free medium increased ROS concentration in a dose-dependent manner, with a higher concentration observed in serum-free medium compared with PBS. Species concentration inside cells peaked 1 h after treatment, followed by a decrease 3 h post treatment. Endothelial cells treated with a plasma dose of 4.2 J cm –2 had 1.7 times more cells than untreated samples 5 days after plasma treatment. The 4.2 J cm –2 plasma dose increased two-dimensional migration distance by 40 per cent compared with untreated control, while the number of cells that migrated through a three-dimensional collagen gel increased by 15 per cent. Tube formation was also enhanced by plasma treatment, with tube lengths in plasma-treated samples measuring 2.6 times longer than control samples. A fibroblast growth factor-2 (FGF-2) neutralizing antibody and ROS scavengers abrogated these angiogenic effects. These data indicate that plasma enhanced proliferation, migration and tube formation is due to FGF-2 release induced by plasma-produced ROS. Non-thermal plasma may be used as a potential tool for applying ROS in precise doses to enhance vascularization.
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Nagaraj, Gayathri, Manjula Balasubramanian, Sameer Kalghatgi, Andrew S. Wu, Ari D. Brooks, Gregory Fridman, Moogega Cooper, et al. "Mechanism of Blood Coagulation by Non-Thermal Atmospheric Pressure Dielectric Barrier Discharge Plasma." Blood 110, no. 11 (November 16, 2007): 3162. http://dx.doi.org/10.1182/blood.v110.11.3162.3162.

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Abstract Introduction: Non-thermal atmospheric pressure dielectric barrier discharge plasma (cold plasma due to its non-thermal nature) has emerged as a promising new tool in medicine due to its ability to coagulate blood rapidly, sterilize tissue without thermal damage and induce apoptosis in malignant tissue. The potential clinical applicability of non-thermal plasma lies in its use in controlling intra-operative microvascular bleeding in organs and in endoscopy. Non-thermal plasma can also be used to treat superficial wounds in trauma through hemostasis while simultaneously inducing surface sterilization. We have previously demonstrated that non-thermal plasma hastens blood coagulation on cut tissue surfaces and accelerates clot formation in whole blood five times faster than natural coagulation. A series of experiments were undertaken to investigate the mechanism of coagulation by non-thermal plasma. Methods/Results: We initially postulated that changes in pH and/or extracellular Ca2+ as a possible mechanism for non-thermal plasma mediated coagulation. Our studies however showed no significant changes in pH or Ca2+ in treated blood. Thermal energy triggered coagulation as seen in conventional electrocautery as well as electric field effects were eliminated as other possible mechanisms. The role of reactive oxygen species (ROS) in coagulation was studied, as non-thermal plasma is known to produce ROS in water. ROS production in blood was blocked with sodium pyruvate, an ROS scavenger, and the results showed no effect on non-thermal plasma induced coagulation. Specific effects of non-thermal plasma on citrated blood samples revealed extremely rapid coagulation with surface gel formation, while clotting studies (PT, aPTT) performed on the plasma beneath the gel revealed consumption of coagulation factors. Examination of the clot formed by non-thermal plasma using Scanning Electron Microscopy (SEM) showed platelet activation with pseudopodia formation, aggregation, and fibrin formation. The effects of non-thermal plasma on fibrinogen solution treated at physiologic pH showed a change in opacity suggesting clot formation. Dynamic Light Scattering (DLS) was used to measure particle size distributions of treated and untreated fibrinogen solutions. Treated fibrinogen exhibited a multi-modal distribution of sizes with the largest size corresponding to the size of fibrin-like structures. This suggests that non-thermal plasma may coagulate blood by the conversion of fibrinogen to fibrin. Evaluation of albumin, our control protein given its non-involvement in coagulation, showed no changes upon exposure to non-thermal plasma. Conclusion: Non-thermal plasma likely promotes coagulation by enhancing the physiologic coagulation process through direct activation of fibrinogen as well as platelet activation and aggregation. Future research will further evaluate the mechanisms of non-thermal plasma induced platelet activation and effects on other proteins in the coagulation cascade. This will lead to newer insights into the physiological aspects of coagulation and clinical utility of non-thermal plasma in medicine.
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Huang, Ji Bo, Wei Ze Wang, Yuan Jun Li, Huan Jie Fang, Dong Dong Ye, Xian Cheng Zhang, and Shan Tung Tu. "A novel strategy to control the microstructure of plasma-sprayed YSZ thermal barrier coatings." Surface and Coatings Technology 402 (November 2020): 126304. http://dx.doi.org/10.1016/j.surfcoat.2020.126304.

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Świecimska, Magdalena, Mirela Tulik, Božena Šerá, Patrycja Golińska, Juliána Tomeková, Veronika Medvecká, Helena Bujdáková, Tomasz Oszako, Anna Zahoranová, and Michal Šerý. "Non-Thermal Plasma Can Be Used in Disinfection of Scots Pine (Pinus sylvestris L.) Seeds Infected with Fusarium oxysporum." Forests 11, no. 8 (August 1, 2020): 837. http://dx.doi.org/10.3390/f11080837.

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The aim of this study was to use diffuse coplanar surface barrier discharge (DCSBD) non-thermal plasma for the disinfection of pine seed surfaces infected with Fusarium oxysporum spores. Artificially infected seeds of Scots pine (Pinus sylvestris L.) were treated with plasma for the following exposure times: 1 s, 3 s, 5 s, 10 s, 15 s, 20 s, 30 s, and 60 s, and subsequently germinated on agar medium in Petri dishes at room temperature for the estimation of seed germination and disinfection effect of plasma treatment. Results of the treated samples were compared to the control samples, which were prepared as follows: seeds uninfected and non-treated with plasma (first control); seeds infected with F. oxysporum and non-treated with plasma (second control); and seeds infected with F. oxysporum, non-treated with plasma, but sterilized with 30% perhydrol (third control). Obtained results indicate that 3 s plasma treatment was an optimal time to inhibit F. oxysporum growth, and at the same time, increase the seed germination. In addition, our results are the first to show the practical application of non-thermal plasma in disinfecting infected Scots pine seeds and improving their germination. According to the results of this study, non-thermal plasma can serve as a seed surface disinfectant in the regeneration of different pine species.
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Zhu, Tao, Yan Dong Wan, Chun Hui Zhang, Ming Han Sun, Xu Wen He, Dong Yao Xu, and Xin Qian Shu. "VOCs Decomposition Using Multiple Catalysis in Non-Thermal Plasma Processing." Advanced Materials Research 152-153 (October 2010): 973–77. http://dx.doi.org/10.4028/www.scientific.net/amr.152-153.973.

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A series of experiments were performed for toluene removal from a gaseous influent at normal temperature and atmospheric pressure by adsorption & non-thermal plasma strength & nano-catalysis technology. Non-thermal plasma was generated by dielectric barrier discharge. Sorbent & nano-catalyst were called combined catalyst which included MnO2/γ-Al2O3 and nano-Ba0.8Sr0.2Zr0.1Ti0.9O3 catalyst. MnO2/γ-Al2O3 has an advantage for ozone removal, while nano-Ba0.8Sr0.2Zr0.1Ti0.9O3 is a kind of good material for improving energy utilize rate. The results showed the synergistic technology resulted in greater enhancement of toluene removal efficiency and energy efficiency and a better inhibition for O3 formation in the gas exhaust. Based on data analysis of FT-IR, the experiment discussed decomposition mechanism and reaction process of toluene. The results showed that synergic effect could control byproducts effectively.
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Li, Yuanjun, Jibo Huang, Weize Wang, Dongdong Ye, Huanjie Fang, Dong Gao, Shantung Tu, Xueping Guo, and Zexin Yu. "Control of the Pore Structure of Plasma-Sprayed Thermal Barrier Coatings through the Addition of Unmelted Porous YSZ Particles." Coatings 11, no. 3 (March 21, 2021): 360. http://dx.doi.org/10.3390/coatings11030360.

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In this study, a new pore structure control method for plasma-sprayed thermal barrier coatings (TBCs) through the addition of unmelted, porous yttria-stabilized zirconia (YSZ) particles was investigated. Through a unique way of feeding powder, two powder feeders were used simultaneously at different positions of the plasma flame to deposit a composite structure coating in which a conventional plasma-sprayed coating was used as a matrix and unmelted micro-agglomerated YSZ particles were dispersed in the dense conventional coating matrix as second-phase particles. The effects of the distribution and content of second-phase particles on the microstructure, mechanical properties, and lifetime were explored in a furnace cyclic test (24 h) of the composite coating. The mechanical properties and lifetime of the composite coating depend on the content and morphology of the particles embedded in the coating. The lifetime of the composite structure coatings is significantly higher than that of the conventional coatings. By adjusting the spraying parameters, the lifetime of the composite coating prepared under the optimum process is up to 145 days, which is about three times that of the conventional coating. The results of this study provide guidance for the preparation of high-performance composite structure TBCs.
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Starikovskiy, A. Yu, and N. L. Aleksandrov. "Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma." Plasma Physics Reports 47, no. 2 (February 2021): 148–209. http://dx.doi.org/10.1134/s1063780x21020069.

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Abstract— The paper presents a review of modern works on gasdynamic flow control using a highly nonequilibrium pulsed plasma. The main attention is paid to the effects based on ultrafast (on the nanosecond time scale for atmospheric pressure) local gas heating, since, at present, the main successes in controlling high-speed flows by means of gas discharges are associated with this thermal mechanism. Attention is paid to the physical mechanisms responsible for the interaction of the discharge with gas flows. The first part of the review outlines the most popular approaches for pulsed energy deposition in plasma aerodynamics: nanosecond surface barrier discharges, pulsed spark discharges, and femto- and nanosecond optical discharges. The mechanisms of ultrafast heating of air at high electric fields realized in these discharges, as well as during the decay of the discharge plasma, are analyzed separately. The second part of the review gives numerous examples of plasma-assisted control of gasdynamic flows. It considers control of the configuration of shock waves in front of a supersonic object, control of its trajectory, control of quasi-stationary separated flows and layers, control of a laminar–turbulent transition, and control of static and dynamic separation of the boundary layer at high angles of attack, as well as issues of the operation of plasma actuators in different weather conditions and the use of plasma for the de-icing of a flying object.
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Dissertations / Theses on the topic "Thermal barriers (plasma control)"

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Debien, Antoine. "Étude électromécanique et optimisation d'actionneurs plasmas à décharge à barrièrediélectrique – Application au contrôle de décollement sur un profil d'aile de type NACA0015." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2253/document.

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Cette thèse est effectuée dans le cadre du projet Européen "PlasmAero" dont le but est de développer et d'étudier des actionneurs plasmas, et de démontrer leur capacité à contrôler des écoulements aérodynamiques. L'actionneur plasma à Décharge à Barrière Diélectrique (DBD) de surface est un moyen innovant pour contrôler un écoulement en utilisant le vent électrique induit par la force électrohydrodynamique (EHD) générée au sein du gaz ionisé. Une première partie est dédiée à l'étude des actionneurs plasmas. L'influence de la géométrie de l'électrode active d'une DBD est précisée par des mesures électriques, optiques et mécaniques. Les régimes de la décharge de surface peuvent être totalement modifiés, tout commel'évolution de la force EHD en fonction du temps, calculée ici par bilan intégral. Une géométrie optimisée permet de supprimer le régime de décharge streamer et d'augmenter l'efficacité de l'actionneur de 0,65 à 0,97 mN/W. De plus, des configurations à multi-électrodes (sliding discharge et multi-DBD) sont étudiées et développées. Une multi-DBD à potentiels alternés a permis d'obtenir un vent électrique record de 10,5 m/s.L'étude du contrôle d'un écoulement décollé à mi-corde ou en bord de fuite sur l'extrados d'un profil NACA 0015 fait l'objet de la seconde partie de la thèse. Une DBD standard à deux électrodes, une multi-DBD à six électrodes et une DBD de type "nanoseconde" sont utilisées pour agir sur une séparation à des nombres de Reynolds atteignant 1,3μ106, avec une transition naturelle ou déclenchée. Les résultats démontrent que le contrôle permet de repousser efficacement la séparation, améliorant ainsi les performances aérodynamiques du profil
This work is conducted in the framework of the European PlasmAero project that aims to demonstrate how plasma actuators can be used to control aircraft aerodynamic. Surface Dielectric Barrier Discharge (DBD) is an innovative solution to control a flow with the electric wind induced by the electrohydrodynamic (EHD) force produced by a surface discharge. A first part is dedicated to plasma actuators study. The exposed electrode shape of a DBD actuator is investigated by electrical, optical and mechanical characterization. Discharges properties and EHD force evolution is fully dependent of exposed electrode shape. With an optimized active electrode shape, streamer discharge is cancelled while actuator effectiveness is increased from 0.65 to 0.97 mN/W. Flow field induced by multiple electrode design is also investigated. An innovative multi-DBD design is proposed. Inhibition of mutual interaction between successive DBD actuators and exposed electrode shape optimization conduct to an electric wind velocity of 10.5 m/s. In a second part, the control of boundary layer separation on a NACA 0015 airfoil is investigated. An ac DBD, a multi-DBD and a nanosecond DBD are used to manipulate separation at a Reynolds number Re = 1.3μ106, with tripped and natural boundary layer. Results show that actuators can effectively remove the separation existing without actuation
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Affonso, Nobrega Pedro Henrique. "Conception et mise au point d’un réacteur plasma innovant pour le traitement de composés organiques volatils en milieu industriel." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEM042/document.

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Des composés organiques volatils (COV) présents dans l'air peuvent avoir un fort impact odorant et doivent être traités. Des techniques de traitement classiques permettent de récupérer ou détruire ces composés. Cependant, ces techniques ne sont pas adaptées aux forts débits d'air et/ou aux faibles concentrations, caractéristiques de certains procédés industriels émetteurs de COV. Une alternative prometteuse est l'utilisation de plasmas non-thermiques. Ce type de plasma, obtenu par des décharges électriques hors-équilibre thermodynamique, contient des espèces réactives qui provoquent la destruction des composés organiques volatils. Cette thèse vise à concevoir, construire et tester un réacteur basé sur des plasmas non-thermiques pour le traitement de COV à l'échelle pilote, afin de démontrer la faisabilité d'un tel procédé pour le traitement d'odeurs présentes dans un effluent industriel. Les résultats obtenus montrent que, couplé à un catalyseur, le traitement d'odeurs par plasma non-thermique a un vrai potentiel d'application à l'échelle industrielle. En parallèle, cette thèse cherche à mieux comprendre le rôle des transferts de masse au sein d'un réacteur à l'aide d'un modèle analytique et de simulations numériques. Nous montrons que ces transferts peuvent devenir le processus limitant dans le traitement, et demandent donc une attention particulière lors du design d'un réacteur basé sur des plasmas non-thermiques
Volatile organic compounds (VOC) present in the atmosphere may have a strong odour impact and, being so, must be treated. Some long-established treatment techniques may be able to recover or destruct these compounds. However, these techniques are not suitable for high flow rates and/or low concentrations, typical conditions found in certain VOC-emitting industrial processes. A promising alternative is the use of non-thermal plasmas. This kind of plasma, obtained through non-equilibrium electric discharges, produce reactive species that prompt the destruction of volatile organic compounds. This thesis aims to conceive, build and test a reactor based on non-thermal plasmas for the abatement of volatile organic compounds at pilot scale, in order to demonstrate the feasability of using such a process to treat odourous compounds present in an industrial effluent. The obtained results show that, combined with a catalyst, the use of non-thermal plasmas for odour control in industrial scale has a real potential. In parallel, this thesis seeks a better understanding of the role played by mass transfer in a non-thermal plasma reactor through the use of an analytical model and numerical simulations. We show that mass transfer may become the limiting process of the treatment, and therefore requires special care throughout the design of a non-thermal plasma reactor
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Barr, Thomas Calhoun III. "Integrative Control of Curly Leaf Pondweed Propagules Employing Benthic Bottom Barriers| Physical, Chemical and Thermal Approaches." Thesis, University of California, Davis, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=3596849.

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The effective management of submersed aquatic macrophytes depends on understanding their reproductive biology. Potamogeton crispus L. (curlyleaf pondweed, Potamogetonaceae) produces numerous asexual propagules that make traditional management difficult. It has spread to roughly half of the counties in California (USA) from alpine habitats such as Lake Tahoe to the tidally influenced Sacramento-San Joaquin Delta. Studies were conducted from May 2012 till October 2012 at the bench and mesocosm scales in Davis and Sacramento, California, to explore the effects of benthic barrier control measures on the propagules (turions) of Potamogeton crispus. The first study examined the effects of three benthic barrier materials (jute, polyethylene and rubber) on turion sprouting. Jute benthic barrier material allows some light and oxygen through the fabric, while polyethylene allows oxygen, but not light. Rubber barrier material blocks light and oxygen exchange. Turion viability, as determined by sprouting, was then assessed post-treatment. Results showed no significant differences at the bench-scale for the untreated control (100% sprouting, SE=0%), jute (100% sprouting, SE=0%), or polyethylene treatments (96.9%, SE=2.1%) (n=16 for all treatments, α = 0.05). Rubber treatments resulted in 48.4% sprouting (SE= 10.6%; n=16). Results for the mesocosm experiments showed significant differences between the control and the jute and polyethylene treatments (control = 98.4% sprouting, SE= 1.6%; jute = 71.9% sprouting, SE= 4.5%; polyethylene= 70.3% sprouting, SE= 4.7%, n=16 for all treatments). Jute and polyethylene treatments were not significantly different in the mesocosm experiment. The mesocosm experiment with the rubber barrier significantly reduced sprouting (29.7% sprouting, SE= 6.1%; n=16) compared to other treatments. While light had minimal impact on sprouting, anoxia appeared to be the main factor inhibiting sprouting using benthic bottom barriers. Barrier induced anoxic stress combined with herbicides may potentially offer enhanced efficacy. The second study explored enhancement of the impermeable rubber barrier material with dilute acetic acid loaded into cassava starch "pearls". Turions were exposed for two weeks and then assessed for viability via post-treatment sprouting protocol with and without hydrosoil at the bench- and mesocosm-scale. Results for the bench-scale showed that the 20.8 mmol L–1 acetic acid treatment was not significantly different (p=.4231) compared to the untreated control (Tukey HDS; p≤0.05). However, the 41.6 mmol L–1 acetic acid treatment was highly significantly different from the control (p-value < 0.0001) at the bench-scale, but did not completely inhibit sprouting (mean sprouting of 31.25% (SE= 11.97)). Complete inhibition of sprouting turions occurred for both experiments at and above acetic acid concentrations of 83.3 mmol L–1 (SE= 0). Results showed that tapioca starch saturated with acetic acid and combined with impermeable benthic barriers may offer an effective chemical treatment for the control of Potamogeton crispus. The final study examined hot water exposures under the barriers to kill and inhibit sprouting in turions. Heated water circulated under an insulated benthic bottom barrier may potentially offer a simple non-chemical rapid method to target surface propagules on the sediment, subterranean propagules and young plants. Heated water was used to treat P. crispus turions at the bench and mesocosm scales (25°C, 40°C, 50°C, 60°, 70°C and 80°C exposures for 30 to 300 seconds). Heated water exposures inhibited sprouting turions at 50°C and 60°C at the mesocosm and the bench scales, however, did not completely inhibit sprouting for all time exposures except at the bench-scale 60°C treatment for 300 seconds. For 70°C and 80°C treatment exposures, there was a slight difference at the 30 second exposure mark, but at 60 second and beyond, all 70°C and 80°C treatments provided 100% inhibition. The cost to raise the temperature 60°C from ambient water temperature under the contained limited volume under insulated barriers is estimated to be approximately $2 per 9.3 m2 (100 ft2) for 5 minute treatments or $3459 ha-1 ($1400 acre-1).

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Fourligkas, Nikolaos. "A new thermal rapid prototyping process by fused material deposition : implementation, modeling and control /." Thesis, Connect to Dissertations & Theses @ Tufts University, 2000.

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Thesis (Ph.D.)--Tufts University, 2000.
Adviser: Charalabos Doumanidis. Submitted to the Dept. of Mechanical Engineering. Includes bibliographical references (leaves 118-124). Access restricted to members of the Tufts University community. Also available via the World Wide Web;
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Krishnaswamy, Arvind. "Substrate Engineering to Control the Synthesis of Carbon Nanotubes." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1413471369.

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Maestro, Dario. "Large Eddy Simulations of the interactions between flames and thermal phenomena : application to wall heat transfer and combustion control." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0074/document.

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Les interactions entre les flammes et les phénomènes thermiques sont le fil conducteur de ce travail. En effet, les flammes produisent de la chaleur, mais peuvent aussi être affectées par des transferts ou des sources de chaleur. La Simulation aux Grandes Echelles (SGE) est utilisée ici pour étudier ces interactions, en mettant l’accent sur deux sujets principaux: le transfert de chaleur aux parois et le contrôle de la combustion. Dans un premier temps, on étudie le transfert de chaleur aux parois dans un modèle de brûleur CH4/O2 de moteur-fusée. Dans un contexte deréutilisabilité et de réduction des coûts des lanceurs, qui constituent des enjeux majeurs, de nouveaux couples de propergols sont envisagés et les flux thermiques à la paroi doivent êtreprécisément prédits. Le but de ce travail est d’évaluer les besoins et les performances des SGEpour simuler ce type de configuration et de proposer une méthodologie de calcul permettant desimuler différentes configurations. Les résultats numériques sont comparés aux donnéesexpérimentales fournies par la Technische Universität München (Allemagne). Dans un deuxième temps, le contrôle de la combustion au moyen de décharges de plasma de type NRP (en anglaisNanosecond Repetitively Pulsed) est étudié. Les systèmes de turbines à gaz modernes utilisent en effet une combustion pauvre dans le but de réduire la consommation de carburant et les émissions de polluants. Les flammes pauvres sont connues pour être sujettes à des instabilités et le contrôle de la combustion peut jouer un rôle majeur dans ce domaine. Un modèle phénoménologique qui considère les décharges de plasma comme une source de chaleur est développé et appliqué à un brûleur pauvre avec prémélange CH4/Air stabilisé par un swirler. LesSGE sont réalisées afin d’évaluer les effets des décharges NRP sur la flamme. Les résultats numériques sont comparés aux observations expérimentales faites à la King Abdulla University ofScience and Technology (Arabie Saoudite)
Interactions between flames and thermal phenomena are the guiding thread of this work. Flamesproduce heat indeed, but can also be affected by it. Large Eddy Simulations (LES) are used hereto investigate these interactions, with a focus on two main topics: wall heat transfer andcombustion control. In a first part, wall heat transfer in a rocket engine sub-scale CH4/O2 burner isstudied. In the context of launchers re-usability and cost reduction, which are major challenges,new propellant combinations are considered and wall heat fluxes have to be precisely predicted.The aim of this work is to evaluate LES needs and performances to simulate this kind ofconfiguration and provide a computational methodology permitting to simulate variousconfigurations. Numerical results are compared to experimental data provided by the TechnischeUniversität München (Germany). In a second part, combustion control by means of NanosecondRepetitively Pulsed (NRP) plasma discharges is studied. Modern gas turbine systems use indeedlean combustion with the aim of reducing fuel consumption and pollutant emissions. Lean flamesare however known to be prone to instabilities and combustion control can play a major role in thisdomain. A phenomenological model which considers the plasma discharges as a heat source isdeveloped and applied to a swirl-stabilized CH4/Air premixed lean burner. LES are performed inorder to evaluate the effects of the NRP discharges on the flame. Numerical results are comparedwith experimental observations made at the King Abdulla University of Science and Technology(Saudi Arabia)
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Mallon, Michael [Verfasser], Jochen [Akademischer Betreuer] Schein, Jochen [Gutachter] Schein, Gianluca [Gutachter] Gregori, and Claus [Gutachter] Hillermeier. "Time efficient radiation model for plasma spectroscopy and model based control of transient thermal arcs / Michael Mallon ; Gutachter: Jochen Schein, Gianluca Gregori, Claus Hillermeier ; Akademischer Betreuer: Jochen Schein ; Universität der Bundeswehr München, Fakultät für Elektrotechnik und Informationstechnik." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2020. http://d-nb.info/1220094803/34.

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Mallon, Michael [Verfasser], Jochen [Akademischer Betreuer] Schein, Jochen Gutachter] Schein, Gianluca [Gutachter] [Gregori, and Claus [Gutachter] Hillermeier. "Time efficient radiation model for plasma spectroscopy and model based control of transient thermal arcs / Michael Mallon ; Gutachter: Jochen Schein, Gianluca Gregori, Claus Hillermeier ; Akademischer Betreuer: Jochen Schein ; Universität der Bundeswehr München, Fakultät für Elektrotechnik und Informationstechnik." Neubiberg : Universitätsbibliothek der Universität der Bundeswehr München, 2020. http://d-nb.info/1220094803/34.

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Gao, Hantian. "Nanoscale Characterization and Control of Native Point Defects in Metal Oxide Semiconductors and Device Structures." The Ohio State University, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1618838504594148.

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Dubois, Diane. "Réalisation et caractérisation d'un réacteur plasma de laboratoire pour des études sur la dépollution des gaz d"échappement." Toulouse 3, 2006. http://www.theses.fr/2006TOU30139.

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Cette thèse concerne l’étude expérimentale des décharges couronne positives à la pression atmosphérique générées dans un réacteur de laboratoire de type pointe – plan alimenté en régime de tension continue et pulsée. La nature et les caractéristiques de la décharge couronne, notamment dans son régime de « breakdown streamer », sont étudiées en fonction du régime et de l’amplitude de l’alimentation de tension, du rayon de courbure de la pointe, de la distance inter – électrodes ou encore de la composition du mélange gazeux en faisant varier les proportions de N2, de O2 et de CO2. La dynamique et la morphologie des ondes d’ionisation sont finement étudiées à l’aide de diagnostics d’imagerie rapide (ICCD Streak caméras) et de mesures instantanées de courant et de tension (oscilloscope rapide) sur des échelles de temps de quelques centaines de nanosecondes. Les dimensions du réacteur ont été adaptées à la capacité des modèles à le simuler et les premiers résultats de comparaison des courbes instantanées de courant issues des modèles et de l’expérience sont présentés dans le but ultérieure d’estimer la nature et la densité des radicaux formés durant la phase de décharge d’un réacteur de dépollution par décharge couronne
The present thesis is devoted to the experimental study of atmospheric positive corona discharges generated in a point to plane corona reactor under DC or pulsed high voltage conditions. The corona discharge characteristics, in particular during “breakdown streamer” mode, are studied according to the high voltage supply conditions (DC or pulsed), the point radius curvature, the gap distance or the gas mixture following the variation of the N2, O2 and CO2 concentration. The dynamics and the morphology of the streamers are also studied using fast imaging (ICCD and Streak cameras) and electrical (oscilloscope) diagnostics on time scale lower than hundred of nanosecond. As the corona discharge reactor dimensions are well adapted, some preliminary results show the comparison between experimental and simulated results which allow us in the future to estimate the localization, the density and the nature of the radical species created during the discharge phase of a corona reactor devoted to air pollution control
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Books on the topic "Thermal barriers (plasma control)"

1

Miller, Robert A. Characterization and durability testing of plasma-sprayed zirconia-yttria and hafnia-yttria thermal barrier coatings. Part 1-Effect of spray parameters on the performance of several lots of partially stabilized zirconia-yttria powder. Cleveland, Ohio: Lewis Research Center, 1993.

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Penetrante, Bernie M., and Shirley E. Schultheis, eds. Non-Thermal Plasma Techniques for Pollution Control. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7.

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Miller, Robert A. Characterization and durability testing of plasma-sprayed zirconia-yttria and hafnia-yttria thermal barrier coatings. Part II. Effect of spray parameters on the performance of several hafnia-yttria and zirconia-yttria coatings. Cleveland, Ohio: Lewis Research Center, 1993.

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Hillard, G. Barry. Experimental measurement of the plasma conductivity of Z93 and Z93P thermal control paint. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Hillard, G. Barry. Plasma current collection of Z-93 thermal control paint as measured in the Lewis Research Center's plasma interaction facility. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Hillard, G. Barry. Plasma current collection of Z-93 thermal control paint as measured in the Lewis Reseach Center's plasma interaction facility. [Washington, DC: National Aeronautics and Space Administration, 1993.

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Beth, Opila, and NASA Glenn Research Center, eds. Investigation into spectroscopic techniques for thermal barrier coating spall detection. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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A, Miller Robert, and Lewis Research Center, eds. Sintering and creep behavior of plasma-sprayed zirconia and hafnia based thermal barrier coatings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1998.

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Engineers, Society of Automotive, and International Fall Fuels & Lubricants Meeting & Exposition (2000 : Baltimore, Md.), eds. Non-thermal plasma. Warrendale, PA: Society of Automotive Engineers, 2000.

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Non-Thermal Plasma Emission Control Systems. Society of Automotive Engineers (SAE), 2001.

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Book chapters on the topic "Thermal barriers (plasma control)"

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Kogelschatz, U. "UV Production in Dielectric Barrier Discharges for Pollution Control." In Non-Thermal Plasma Techniques for Pollution Control, 339–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_24.

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Frank, Norman W., and Shinichi Hirano. "The History of Electron Beam Processing for Environmental Pollution Control and Work Performed in the United States." In Non-Thermal Plasma Techniques for Pollution Control, 1–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_1.

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Civitano, Luigi. "Industrial Application of Pulsed Corona Processing to Flue Gas." In Non-Thermal Plasma Techniques for Pollution Control, 103–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_10.

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Masuda, Senichi. "Report on Novel Dry DeNOx/DeSOx Technology for Cleaning Combustion Gases from Utility Thermal Power Plant Boilers." In Non-Thermal Plasma Techniques for Pollution Control, 131–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_11.

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Abolentsev, V. A., S. V. Korobtsev, D. D. Medvedev, V. D. Rusanov, and V. L. Shiryaevsky. "Laboratory Studies of Plasmochemical Oxidation Process Energized by Pulsed Streamer Discharges." In Non-Thermal Plasma Techniques for Pollution Control, 139–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_12.

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Amirov, R. H., E. I. Asinovsky, I. S. Samoilov, and A. V. Shepelin. "Experimental Studies on No Removal from Methane Combustion Products Using Nanosecond Corona Discharge." In Non-Thermal Plasma Techniques for Pollution Control, 149–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_13.

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Mizuno, Akira, A. Chakrabarti, and Ken Okazaki. "Application of Corona Technology in the Reduction of Greenhouse Gases and other Gaseous Pollutants." In Non-Thermal Plasma Techniques for Pollution Control, 165–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_14.

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Vogtlin, G. E., and B. M. Penetrante. "Pulsed Corona Discharge for Removal of NOx from Flue Gas." In Non-Thermal Plasma Techniques for Pollution Control, 187–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_15.

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Masuda, S. "Destruction of Gaseous Pollutants and Air Toxics by Surface Discharge Induced Plasma Chemical Process (SPCP) and Pulse Corona Induced Plasma Chemical Process (PPCP)." In Non-Thermal Plasma Techniques for Pollution Control, 199–209. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_16.

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Helfritch, Dennis J. "Pulsed Corona Discharge for Hydrogen Sulfide Decomposition." In Non-Thermal Plasma Techniques for Pollution Control, 211–21. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-78476-7_17.

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Conference papers on the topic "Thermal barriers (plasma control)"

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Leconte, M., P. Beyer, X. Garbet, S. Benkadda, Hans-Jürgen Hartfuss, Michel Dudeck, Jozef Musielok, and Marek J. Sadowski. "Control of Edge Transport Barrier relaxations using Resonant Magnetic Perturbations." In PLASMA 2007: International Conference on Research and Applications of Plasmas; 4th German-Polish Conference on Plasma Diagnostics for Fusion and Applications; 6th French-Polish Seminar on Thermal Plasma in Space and Laboratory. AIP, 2008. http://dx.doi.org/10.1063/1.2909148.

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Dinwiddie, Ralph B., Stephen C. Beecher, Wallace D. Porter, and Ben A. Nagaraj. "The Effect of Thermal Aging on the Thermal Conductivity of Plasma Sprayed and EB-PVD Thermal Barrier Coatings." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-282.

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Thermal barrier coatings (TBCs) applied to the hot gas components of turbine engines lead to enhanced fuel efficiency and component reliability. Understanding the mechanisms which control the thermal transport behavior of the TBCs is of primary importance. Electron beam-physical vapor deposition (EB-PVD) and air plasma spraying (APS) are the two most commonly used coating techniques. These techniques produce coatings with unique microstructures which control their performance and stability. The density of the APS coatings was controlled by varying the spray parameters. The low density APS yttria-partially stabilized zirconia (yttria-PSZ) coatings yielded a thermal conductivity that is lower than both the high density APS coatings and the EB-PVD coatings. The thermal aging of both fully and partially stabilized zirconia are compared. The thermal conductivity of the coatings permanently increases upon exposure to high temperatures. These increases are attributed to microstructural changes within the coatings. This increase in thermal conductivity can be modeled using a relationship which depends on both the temperature and time of exposure. Although the EB-PVD coatings are less susceptible to thermal aging effects, results suggest that they typically have a higher thermal conductivity than APS coatings before thermal aging. The increases in thermal conductivity due to thermal aging for plasma sprayed partially stabilized zirconia have been found to be less than for plasma sprayed fully stabilized zirconia coatings.
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Zhou, Z., N. Eguch, and A. Ohmori. "Microstructure Control of Zirconia Thermal Barrier Coatings by Using YAG Laser Combined Plasma Spraying Technique." In ITSC 1997, edited by C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0315.

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Abstract As an ideal zirconia thermal barrier coating, the coating microstructure with the strong bonding among coating particles and with certain amount porosities in the coating without connected porosity is desirable. However, it is difficult for usual plasma-spraying to create a zirconia coating with these characters. In order to obtain an excellent zirconia coating with these characters, we prepared zirconia coating on steel substrate under coated with NiCrAlY alloys by means of a hybrid spraying (that is, YAG laser combined plasma spraying) and studied the effect of this hybrid spraying process and plasma and laser conditions on the microstructure of coating, and further compared the microstructure of the coating in this hybrid spraying with that in post-laser irradiation of as-sprayed zirconia coating. It is known that the microstructure with densification is formed by the post-laser irradiation of as-sprayed coating and that microcracks are newly produced in the process of rapid cooling. However, by using this newly-developed hybrid spraying, the microstructure with partial densification in the coating without connected porosities was formed and cracks which is generally produced in the post-laser irradiation treatment were inhibited completely. In addition, this hybrid spraying can be done without the post-treatment of coating. Furthermore, the coating properties, such as hardness and wear resistance associated with bonding state among the coating particles in the zirconia coating created by this hybrid spraying were improved.
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Kulkarni, A. A., S. Sampath, A. Goland, and H. Herman. "Porosity-Thermal Conductivity Relationships in Plasma Sprayed Zirconia Coatings." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p1061.

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Abstract Thermal barrier coatings (TBCs) are used on heat engine parts to impart protection to components against failure under excessive heat loads, to increase inlet temperatures with consequent improvements in efficiency, and to reduce requirements for cooling. Control of thermal conductivity is addressed since low thermal conductivity depends not only on the nature of the yttria stabilized zirconia (YSZ) layer, but also on the morphology of pores and cracks, which are closely linked to process parameters. This paper will present the influence of feedstock characteristics (particle size distribution and powder morphology) and thermal cycling on porosity content and thermal conductivity of zirconia coatings. The results show increased porosity with particle size, due to an increase in the degree of particle fragmentation and unmelted particles, leading to lower thermal conductivity. Coatings sprayed with powders of different powder morphology yielded changes in porosity and interlamellar contact, thus, influenced thermal conductivity. Sintering effects during thermal cycling resulted in reduced porosity and increased thermal conductivity.
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Gell, Maurice, Fang Wu, Eric H. Jordan, Nitin P. Padture, Baki M. Cetegen, Liangde Xie, Alper Ozturk, Amol Jadhav, Dianying Chen, and Xinqing Ma. "The Solution Precursor Plasma Spray Process for Making Durable Thermal Barrier Coatings." In ASME Turbo Expo 2005: Power for Land, Sea, and Air. ASMEDC, 2005. http://dx.doi.org/10.1115/gt2005-68942.

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The Solution Precursor Plasma Spray (SPPS) process involves the injection of atomized droplets of precursor into the plasma plume, instead of powder that is used in conventional plasma spray. The resultant thermal barrier coating (TBC) microstructure consists of (1) through-coating-thickness cracks, (2) ultra-fine splats, and (3) nanometer and micrometer-sized dispersed pores. These unique SPPS microstructural features provide highly durable TBCs. The SPPS TBCs in 1121°C /1 hour cyclic furnace tests exhibit a significantly improved spallation life compared to APS, DVC, and EB-PVD/Pt-Al TBCs. Extensive process diagnostic and modeling studies have been conducted to provide a foundation for understanding and control of the process. Process/microstructure/property relationships have been defined. Extension of the process for making thick coatings (> 3mm) and low thermal conductivity coatings are described.
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Taylan, Onur, and Halil Berberoglu. "Discharge of Carbon Dioxide Using a Non-Thermal Plasma Reactor." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17559.

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This paper reports a numerical study on the discharge of carbon dioxide using a non-thermal dielectric barrier discharge (DBD) plasma reactor at ambient conditions. DBD plasma reactors have been used for various applications due to their ease of production, process control, operation at different conditions. The applications of DBD plasma reactors include discharge of gases. Carbon dioxide is a greenhouse gas formed as a byproduct of fossil fuel combustion. Use of DBD non-thermal plasma reactor can be a promising technology for carbon dioxide mitigation due to its operation at low temperatures, lack of need for catalysts, and flexibility in controlling the products generated. In this study, a tubular DBD non-thermal plasma reactor was modeled with different electrode materials separated by different dielectric materials. The aim was to provide guidelines for the design and material selection for optimizing DBD plasma reactors for CO2 discharge. A parametric set of simulations was performed using a finite element solver to investigate how electrode and dielectric materials affect the discharge volume of CO2 and power requirement of the non-thermal plasma discharge of CO2. The results showed that electrode material did not affect the discharge or the power requirement. However, dielectric material with higher permittivity or lower conductivity increased the gas discharge and power requirement. Among the analyzed materials, aluminum electrode and mica tube were suggested based on the simulation results for the maximum gas discharge and low power requirement.
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Wroblewski, Donald, Onomitra Ghosh, Annie Lum, David Willoughby, Michael VanHout, Kristina Hogstrom, Soumendra N. Basu, and Michael Gevelber. "Modeling and Parametric Analysis of Plasma Spray Particle State Distribution for Deposition Rate Control." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68752.

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Plasma spray for depositing thermal barrier coatings features large distributions of particle states that result in significant variations in coating quality. These variations arise from distributions of particle sizes, large spatial gradients of plasma thermal-fluid fields, and temporal variations of the arc and jet. This paper describes a simplified approach for studying how particle state distributions are influenced by torch conditions and powder distributions, and the implications for deposition rate monitoring and control. The approach combines a simplified jet model with a more detailed particle model. The important fluid-thermal spatial gradients in the plasma jet are captured using a three zone model: a core region, modeled by growth of a turbulent shear layer around a laminar core, a transition region and a similarity region. Plasma-particle momentum and thermal interactions, particle phase transitions, internal particle temperature gradients, and collapse of in-flight hollow particles have been modeled using a multi-lumped particle model. Effects of distributions of particle size, particle morphology, injection velocity, and carrier gas flow were studied for YSZ spray in an Ar-He plasma. The results provide guidance on sensor design and operation and on approaches for plume location control.
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Lugscheider, E., F. Ladru, N. Gourlaouen, and C. Gualco. "Enhanced Atmospheric Plasma Spraying of Thick TBCS by Improved Process Control and Deposition Efficiency." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1583.

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Abstract The gasturbine industry is performing utmost efforts to allow increased operation temperatures to improve engine efficiency by a reduced cooling air/fuel-ratio. The reason is to save fuel and at the same time lower emission rates. A possible solution to improve the insulation of the Thermal Barrier Coating (TBC) is followed by the strategy of developing reliable thick TBCs. To be successful concerning the coating quality and to apply thick TBCs at reasonable costs and spray time it is necessary to apply the coating consistently by high deposition rates. The plasma spraying of thicker coatings leads to long spray periods which demands for a process control to keep the process parameters within the tolerances during the entire spray procedure. A major property is the control of substrate temperature with pyrometer systems and to define the process tolerances. Furthermore, a high deposition efficiency is of prime importance to shorten spray times. The optimisation of the gas composition in terms of viscosity and thermal conductivity (SPRAL 22) enables to increase dramatically this efficiency by 30% to 70%. Moreover, in order to reduce thermal expansion mismatch between substrate and ceramic top coat, a high amount of porosity is beneficial to lower young's modulus of the ceramic top. This can be achieved by adding a polymer powder to the yttria partly stabilised zirconia powder. It also leads to an increase in deposition efficiency.
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Versailles, Philippe, Wajid Ali Chishty, and Huu Duc Vo. "Plasma Actuation Control of Boundary Layer Flashback in Lean Premixed Combustor." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68224.

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Dry low emissions premixed combustion systems have the ability to give larger NOx emissions reduction in comparison to diffusion type of combustors. However, these systems are prone to flashback because the fuel and oxidizers are mixed upstream of the combustion chamber. This is particularly true for premixed systems burning high-reactivity fuels due to their higher flame speed. Flashback is undesirable in gas turbines because it leads to overheating and failure of fuel nozzles and premixing sections. Recently, a novel application of Plasma Actuation through non-thermal Dielectric Barrier Discharge has been shown to significantly delay flashback in the core flow along the axis of the premixer. Building on this successful endeavour, efforts were directed to prove the effectiveness of the control method in situations where flashback was triggered in the boundary layer. Results show that the current application delays the occurrence of flashback in the boundary layer of the premixer to higher equivalence ratios. Improvements in the combustor operability margin of 10 to 14% when burning natural gas-air mixtures, and of about 3.5% when replacing the fuel by an equimolar mixture of natural gas and hydrogen, were achieved. It was found that the proposed application of plasma actuation is even more efficient in preventing flashback in the boundary layer than in the core flow.
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Friis, M., C. Persson, and J. Wigren. "Influence of the Plasma Spray Process on the Microstructure of Atmospheric Plasma Sprayed Yttria Stabilized ZrO2." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0435.

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Abstract Plasma spraying is a very complex process, controlled by a large number of process parameters. The spray gun parameters control the plasma plume and thereby the velocity and temperature of the particles in the plasma. Some of the spray gun parameters are difficult or impossible to control, but variations of them give rise to fluctuations in the microstructure of the sprayed thermal barrier coating and thereby low reproducibility. By movement of the control from the spray gun to direct control of the particle properties in the plasma this problem will be avoided, and it should result in better process control, higher quality of the final coating and thus improved reproducibility. In this study, the influence of the plasma spray process on the coating microstructure was investigated. An orthogonal factorial designed experiment was performed, where eight process parameters were varied, resulting in 16 different coatings. The particle properties were observed in-situ with the optical measurement system DPV 2000. The microstructure of the coatings was studied using optical microscopy and the amount of different features, i.e. cracks and pores, was quantified. Multiple linear regression was used to find models describing the relation between the spray gun parameters and the particle properties, between the spray gun parameters and the microstructure, and between the particle properties and the microstructure. The results showed that the spray gun parameters well describe the variation in particle velocity and particle temperature. Further, it was found that particle velocity, particle temperature, spray angle, and substrate temperature are the most important parameters concerning influence on the coating microstructure. However, their influence on the different microstructure features varied. The study implies that focus can be set on one or two particle properties measured in the plasma, instead of the numerous spray gun parameters.
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Reports on the topic "Thermal barriers (plasma control)"

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Jarosz, Paul. Plasma Electrolytic Oxidation (PEO) Coatings as Superior Thermal Barriers for Engine Pistons - F. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1604429.

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Zhuang, Q. D., H. Guo, Q. Y. Han, J. V. R. Heberlein, and E. Pfender. Substrate temperature measurement and control during thermal plasma CVD. Office of Scientific and Technical Information (OSTI), September 1993. http://dx.doi.org/10.2172/10177091.

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Christopher R. McLaron. MERCURY REMOVAL IN A NON-THERMAL, PLASMA-BASED MULTI-POLLUTANT CONTROL TECHNOLOGY FOR UTILITY BOILERS. Office of Scientific and Technical Information (OSTI), December 2004. http://dx.doi.org/10.2172/838692.

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Matthew B. Loomis. MERCURY REMOVAL IN A NON-THERMAL, PLASMA-BASED MULTI-POLLUTANT CONTROL TECHNOLOGY FOR UTILITY BOILERS. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/834583.

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Rosocha, L. A., A. W. Miziolek, M. J. Nusca, J. S. Chang, and J. T. Herron. Reactions of oxides of nitrogen (NO{sub x}) leading to the formation of nitric acid (HNO{sub 3}) in non-thermal plasmas (NTPs). White paper for the Strategic Environmental Research and Development Program (SERDP) (Compliance Project CP-1038: Development of non-thermal plasma reactor technology for control of atmospheric emissions). Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/334238.

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