Relevant bibliographies by topics / Schlieren method

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Schlieren method'

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

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Journal articles on the topic "Schlieren method"

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Tregub, V. P. "A color schlieren method." Journal of Optical Technology 71, no. 11 (2004): 785. http://dx.doi.org/10.1364/jot.71.000785.

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Wu, Wen Tang, Yan Ji Hong, Ji Fei Ye, and Guan Lei Jiang. "Application of the Rainbow Schlieren Method in Free Underexpanded Jets." Applied Mechanics and Materials 313-314 (March 2013): 750–53. http://dx.doi.org/10.4028/www.scientific.net/amm.313-314.750.

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An experimental investigation into free underexpanded jets is described. In this paper the experiment took the axis-symmetry unexpended jets as the object, used the typical "Z" schlieren system and replaced the edge with rainbow filter.The rainbow schlieren method is used to obtain measurements in underexpanded jets with nozzle pressure ratios ranging from 2.97 to 19.80. Obtaining the result of that the influence of pressure ratio on jet structure. This paper provides an operation method in the concrete and some useful reference for the rainbow schlieren technique.
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Martínez-González, A., D. Moreno-Hernández, J. Guerrero-Viramontes, M. León-Rodríguez, J. Zamarripa-Ramírez, and C. Carrillo-Delgado. "Temperature Measurement of Fluid Flows by Using a Focusing Schlieren Method." Sensors 19, no. 1 (2018): 12. http://dx.doi.org/10.3390/s19010012.

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A method for measuring planar temperature fields of fluid flows is proposed. The focusing schlieren technique together with a calibration procedure to fulfill such a purpose is used. The focusing schlieren technique uses an off-axis circular illumination to reduce the depth of focus of the optical system. The calibration procedure is based on the relation of the intensity level of each pixel of a focused schlieren image to the corresponding cutoff grid position measured at the exit focal plane of the schlieren lens. The method is applied to measure planar temperature fields of the hot air issuing from a 10 mm diameter nozzle of a commercial Hot Air Gun Soldering Station Welding. Our tests are carried out at different temperature values and different planes along the radial position of the nozzle of the hot air. The experimental values of temperature measurements are in agree with those measured using a thermocouple.
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Samsudin, Dahrum, Bukhari Manshoor, M. D. Anuar, M. S. Othman, and Amir Khalid. "Study of Schlieren Optical Visualization Basics Technique and the Principle." Applied Mechanics and Materials 773-774 (July 2015): 506–10. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.506.

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This paper presents a schlieren optical visualization technique and its application in observation of the changes of intensity in real images. Schlieren optical visualization technique system is the unique technique because it produces a neutral image easily-interpretable image of refractive-index-gradient fields. The schlieren technique remains to be one of the most powerful techniques to visualize the flow and useful as a tool in order to observe the flow characteristics, fuel-air mixing, spray evaporation and flame development. The schlieren system provides a method to viewing the flow through the transparent media. This paper present the basics technique of schlieren system especially for Z-type and two mirror schlieren system. This optical visualization photography together with digital video camera will capture the detail spray evaporation, mixture formation and flame process.
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Wang, Dian Kai, Yan Ji Hong, Qian Li, and Ji Fei Ye. "Design of a High Resolved Schlieren System." Advanced Materials Research 631-632 (January 2013): 842–45. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.842.

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A schlieren system with high time and space resolution was developed to diagnose the hypersonic flow field with high speed, low density and intensive shock interactions. The key technique of color filter used for color schlieren was developed. The time resolution reached to 100ns and the space resolution reached to 0.1mm. In shock tunnel with Mach 5, bow shock controlled by single laser pulse was investigated with the schlieren system, and the interaction of oblique shocks generated by double ramps was detected with color schlieren. The complex flow fields are clearly exploded, which proves that the schlieren system designed in this paper supplies an efficient method in the diagnostics of hypersonic flow field.
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YAMAGUCHI, Yutaka, Masashi KASHITANI, Shinichi WADA, and Teruo SAITO. "Visualization Characteristics of a Sharp Focusing Schlieren Method." Journal of the Visualization Society of Japan 20, no. 77 (2000): 158–64. http://dx.doi.org/10.3154/jvs.20.158.

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Nyein, M. M. "Spherical surface control by Background Oriented Schlieren method." Journal of Physics: Conference Series 1421 (December 2019): 012072. http://dx.doi.org/10.1088/1742-6596/1421/1/012072.

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Zobov, E. A., A. N. Sidorov, and I. G. Litvinova. "Investigation of sliding sparks by the schlieren method." Journal of Applied Mechanics and Technical Physics 27, no. 1 (1986): 16–19. http://dx.doi.org/10.1007/bf00911113.

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PRISACARIU, Emilia, Tudor PRISECARU, Valeriu VILAG, et al. "Post-Processing of Schlieren Images." INCAS BULLETIN 13, no. 3 (2021): 113–22. http://dx.doi.org/10.13111/2066-8201.2021.13.3.10.

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In general, the Schlieren visualization method is used to qualitatively describe phenomena. However, recent studies have attempted to convert the classical Schlieren system into a quantitative method to describe certain flow parameters. This paper aims at analysing pictures from a qualitative and a quantitative point of view. The post-processing of images for both situations is described based on different applications. Real examples are used and both methodologies and logical schemes are explained. The article focuses on image processing, and not on the studied phenomena.
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Samsudin, Dahrum, M. D. Anuar, Safwan Othman, Bukhari Manshoor, and Amir Khalid. "Application of Schlieren Optical Visualization System in External Combustion and Internal Combustion Engine: A Review." Applied Mechanics and Materials 773-774 (July 2015): 535–39. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.535.

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Schlieren optical visualization technique system is the unique technique due to the ability in producing a neutral image easily-interpretable image of refractive-index-gradient areas. The Schlieren system provides a method for viewing the flow through the transparent media and the most using this technique is to photograph the flow. This paper presents the review of the application of the Schlieren optical visualization system external and internal combustion engine in order to observe the fuel-air mixing and flame development during the burning process. The basic technique of Schlieren system, especially for Z-type and two mirror Schlieren system provide a powerful and clearly image to visualize the changes of the density in a transparent medium. This method can capture spray evaporation, spray interference and mixture formation clearly with real images. Analysis of optical image visualization observations reveals that the mixture formation of fuel and air exhibits the influence of the ignition and flame development. Thus, the observation of systematic control of the creation of a mixture of experimental apparatus allows us to achieve significant progress in the combustion process and will present the information to understanding the basic terms of reduced fuel consumption and exhaust emissions.
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Dissertations / Theses on the topic "Schlieren method"

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Kotrík, Marcel. "Vliv ochranné atmosféry na vlastnosti svaru při kondukčním laserovém svařování plechů z konstrukční uhlíkové oceli." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399298.

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In the thesis are analysed influences of three shield gases, based on literary pursuit. Compared was influence of the gas consisting of pure Ar, mixture Ar with 3vol.% CO2 and the mixture Ar with 18vol.% CO2 on mechanical properties of conduction laser welded blunt welds made from structural steel DC01 and S235JR with thickness 3mm and 2mm. Compared were strength properties of the welds in tension, weld hardness and hardness of the heat affected area under the low stress. Further was observed and compared stream of the gases during welding process and its influences on the appearance of the trial welds. On the metallographical cuts of the welds were evaluated mistakes and dimensions of the welds.
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Vieira, Marcelo Mendes. "Estudo experimental de jatos evaporativos." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/3/3132/tde-11042002-132126/.

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Foi construído um arranjo experimental para estudar o comportamento dos jatos evaporativos. Um injetor foi projetado para controlar e manter constantes a pressão e temperatura de reservatório durante a injeção. Um bocal cônico convergente de seção reta com diâmetro de saída de 0,30 mm e ângulo entre sua geratriz e seu eixo simetria igual à 10º forma o elemento principal do injetor. O jato é descarregado em uma câmara de baixa pressão de dimensões suficientemente grandes para manter a pressão constante durante o curto período de ensaio, igual à 1 s. Quando injetado, o líquido sofre uma repentina queda de pressão ocasionando sua evaporação. Os fluidos utilizados são os combustíveis querosene e óleo diesel, e a substância n-dodecano, os quais se caracterizam pela possibilidade de uma evaporação completa, de forma adiabática. Utilizou-se o método \"schlieren\" para a visualização do escoamento. A análise dos jatos é feita de forma qualitativa através dos registros fotográficos. Foram observados os seguintes tipos de jato: (1) contínuo, (2) pulverizante e (3) evaporação na superfície. O primeiro jato não implica em imediata mudança de fase tornando o jato de líquido emergente intacto. Com o aumento da temperatura de injeção, existe o espalhamento e a evaporação do jato, formando o segundo tipo de jato, onde é possível visualizar o campo do gradiente de densidade do escoamento e a formação de ondas de evaporação e de choque que pode ocorrer a uma distância proporcional a vários diâmetros à jusante. Em jatos com evaporação completa, foram constadas a formação de ondas de choque tanto de formas elipsóide como de esferóide para elevadas temperaturas. As fotografias digitais são submetidas à filtragem e processamento matemático para melhor destacar tais fenômenos do escoamento.
An experimental apparatus has been built to study the behaviour of flashing jets. An injector was designed to control and maintain the jet pressure and temperature at constant values during the injection process. A conical convergent nozzle whose main dimensions are 0,30 mm of exit diameter, 8 mm long, and a convergence half-angle of 10º is the central component of the injection system. The jet is discharged into a low-pressure chamber large enough to keep the reservoir pressure constant during the short test period of about 1 s. As the testing liquid expands in the nozzle it undergoes a sudden pressure drop causing its evaporation. The fluids are usual fuels, such as kerosene and diesel oil, and the substance ndodecane, which are distinguishable by the possibility of a complete evaporation in an isoentropic expansion process. The photographic method \"schlieren\" is used for flow visualisation. A qualitative analysis is made of the photographic documentation of the images obtained using a CCD camera. The images can be grouped into three categories of jets: (1) continuous, (2) shattering, and (3) with surface evaporation. The first regime has an undisturbed a liquid column, which remains more or less intact during the injection process. In the second type, the existing liquid jet is shattered by vapour nucleation and, in some cases, shock waves are clearly visible. It happens at higher temperature than the preceding evaporation mode. Finally, in special situations, the jet undergoes an evaporation at its surface and the two-phase mixture expands at a high speed followed by a shock wave before the mixture attains the pressure reservoir.
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Mlynski, Michael Frank. "Eine neue Methode des unscharfen Schließens für Expertensysteme." Aachen : Klinkenberg, 2003. http://deposit.d-nb.de/cgi-bin/dokserv?idn=967853923.

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Carnell, Mark Thomas. "The application of optical diagnostics to high energy electromagnetic acoustic transducers." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/11239.

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This thesis is concerned with the design and construction of an electromagnetic acoustic transducer (EMAT) and the characterisation of its acoustic field both conventionally, using a hydrophone and with high resolution laser illuminated schlieren techniques. During the early 80s the introduction of the EMA T along with the other types of shock wave source used for lithotripsy, revolutionised the treatment of stone disease. The process of shock wave induced destruction of calculi and the use of shock waves in other areas of medicine will be discussed, along with the causes and effects of stone disease in man. For the first time high temporal and spatial resolution schlierenimages of the shock waves and there interaction with simulation kidney stones have been recorded. The technique provides a clearer picture of the fragmentation process and may assist research into the suitability of shock wave treatment in other areas of medicine currently under investigation. Schlieren studies of the acoustic field have shown the complex structure of not only the EMA T shock wave, but also that associated with cavitation in the field. The primary source of cavitation is due to the rupture and subsequent collapse of bubbles generated in the water by the strong rarefaction phase of the shock wave. The images give evidence for the interaction of these 'primary' cavitation shocks with bubbles in the field, the collapse of some of these bubbles giving rise to additional or 'secondary' cavitation shocks. An optical lensing effect introduced by the shock has also been investigated. Objects seen through or immersed in the field of an EMAT shock wave such as cavitation, appear highly distorted, due to the strong positive and negative lensing effects associated with the changing refractive index of the compression and rarefaction cycles of the shock wave.
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Domens, Pierre. "Contribution a l'étude des décharges électriques dans les grands intervalles d'air." Pau, 1987. http://www.theses.fr/1987PAUU3011.

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Etude par strioscopie de la phase leader des décharges positives dans les grands intervalles d'air soumis a une sonde manœuvre. Résultats expérimentaux en mode image par image et balayage. Etude expérimentale et modélisation des streamers sous tension continue et sous tension impulsionnelle. Calcul de la répartition spatio-temporelle de la charge de tête, des courants a l'électrode haute tension et du champ au plan. Extension du modèle aux grandes distances
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Mlynski, Michael Frank [Verfasser]. "Eine neue Methode des unscharfen Schließens für Expertensysteme / vorgelegt von Michael Frank Mlynski." Aachen : Klinkenberg, 2003. http://d-nb.info/967853923/34.

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Todoroff, Violaine. "Mesure d’un champ de masse volumique par Background Oriented Schlieren 3D. Étude d’un dispositif expérimental et des méthodes de traitement pour la résolution du problème inverse." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/11303/1/todoroff.pdf.

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Ces travaux consistent à mettre en place un dispositif expérimental BOS3D permettant la reconstruction du champ de masse volumique instantané d'un écoulement ainsi qu'à développer un algorithme de reconstruction permettant une mise à disposition rapide des résultats ainsi qu'une robustesse liée à un nombre faible de points de vue. La démarche a consisté dans un premier temps à développer un algorithme de reconstruction BOS3D applicable à toutes les configurations expérimentales. Pour cela, le problème direct a été reformulé sous forme algébrique et un critère a été défini. Cette formulation ainsi que les équations issues des méthodes d'optimisation nécessaires à la minimisation du critère ont été parallélisés pour permettre une implémentation sur GPU. Cet algorithme a ensuite été testé sur des cas de références issus de calcul numérique afin de vérifier si le champ reconstruit par l'algorithme était en accord avec celui fourni. Dans ce cadre, nous avons développé un outil permettant de simuler numériquement une BOS3D afin d'obtenir les champs de déviation associées aux écoulements numériques. Ces champs de déviation ont ensuite été fournis comme entrée au code et nous ont permis d'étudier la sensibilité de notre algorithme à de nombreux paramètres tels que le bruit sur les données, les erreurs de calibration, la discrétisation du maillage... Ensuite, afin de tester notre code sur des données réelles nous avons mis en place un banc expérimental BOS3D pour la reconstruction du champ de masse volumique instantané. Cela a nécessité l'étude d'un nouveau moyen de mesure, faisant appel à des techniques de calibrage multi-caméras et de nouvelles stratégies d'illumination su fond. Finalement les données issues de l'expérimentation ont été utilisées comme entrée de notre algorithme afin de valider son comportement sur données réelles.
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Janßen, Paola [Verfasser]. "Schließen mit Erfahrungssätzen : Untersuchung des Zusammenhangs zwischen statistischen und juristischen Methoden der Überzeugungsbildung / Paola Janßen." Baden-Baden : Nomos Verlagsgesellschaft mbH & Co. KG, 2021. http://d-nb.info/1237168201/34.

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Balzer, Jan. "IT-unterstützte Unternehmensanalyse : Grundlagen, Methoden und Konzept für einen fallbasierten Ansatz /." Saarbrücken : VDM, Müller, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2871771&prov=M&dok_var=1&dok_ext=htm.

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Procházka, Libor. "Studium vlivu ochranné atmosféry na kvalitu svaru a parametry laserového svařování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-317188.

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The subject of this diploma thesis is the use of laser welding technology in protective atmospheres. Based on the literary research presented in the theoretical part of the thesis, two experiments were made. Welding of materials X5CrNi18-10 and X2CrNiMo17-13-2. Welded sheets were performed in three different protective atmospheres. Samples were made from the welded sheets for measuring tensile strength, hardness, macrostructure and microstructure. These samples were analyzed. The output of the analysis is the evaluation of the impact that the protective atmosphere have on the quality of the welded joint and optimal process parameters.
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Books on the topic "Schlieren method"

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Krishnamurthy, Muralidhar, and SpringerLink (Online service), eds. Schlieren and Shadowgraph Methods in Heat and Mass Transfer. Springer New York, 2012.

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Panigrahi, Pradipta Kumar, and Krishnamurthy Muralidhar. Schlieren and Shadowgraph Methods in Heat and Mass Transfer. Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4535-7.

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Krivoshlykov, Sergej G. Quantum-theoretical formalism for inhomogeneous graded-index waveguides. Akademie Verlag, 1994.

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Schlieren and shadowgraph techniques: Visualizing phenomena in transparent media. Springer, 2001.

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Bociort, Florian. Imaging properties of gradient-index lenses. Verlag Köster, 1994.

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European Nuclear Simulation Symposium (2nd 1990 Schliersee, Germany). Nuclear simulation: Second European Nuclear Simulation Symposium, Schliersee, October 1990, proceedings. Edited by Heller Moshe R. 1944- and Applied Simulation Technology GmbH. Springer-Verlag, 1990.

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International Conference on Soft Methods in Probability and Statistics (4th 2008 Toulouse, France). Soft methods for handling variability and imprecision. Springer Verlag, 2008.

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V, Perez M., and Bao C, eds. Gradient-index optics: Fundamentals and applications. Springer, 2002.

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Diagrams 2010 (2010 Portland, Or.). Diagrammatic representation and inference: 6th international conference, Diagrams 2010, Portland, OR, USA, August 9-11, 2010 : proceedings. Springer, 2010.

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R, Meyer-Arendt Jurgen, ed. Selected papers on schlieren optics. SPIE Optical Engineering Press, 1992.

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Book chapters on the topic "Schlieren method"

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Chashechkin, J. D. "Colour Schlieren Method." In Optical Methods in Dynamics of Fluids and Solids. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82459-3_35.

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Sandner, H. "Introduction to the Schlieren and Shadowgraph Method." In Optical Measurements. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-662-02967-1_3.

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Spornik, N. M. "Holographic Color Schlieren Method of Flow Visualization." In Flow Visualization VI. Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84824-7_118.

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Hatanaka, Kazuaki, and Tsutomu Saito. "Background Oriented Schlieren Method Using Multi-scale Periodic Pattern." In 29th International Symposium on Shock Waves 1. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-16835-7_71.

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Kashitani, Masashi, S. Nakao, and Y. Miyazato. "Basic Experiment on Focusing Schlieren PIV Method with LED Light Source." In 31st International Symposium on Shock Waves 1. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-91020-8_50.

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Richard, H., M. Raffel, M. Rein, J. Kompenhans, and G. E. A. Meier. "Demonstration of the applicability of a Background Oriented Schlieren (BOS) method." In Laser Techniques for Fluid Mechanics. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-08263-8_9.

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Politz, Christina, Benedikt Over, and Tania Kirmse. "The Application of Background Oriented Schlieren Method to Aircraft Wake Vortex Investigations." In Research Topics in Aerospace. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34738-2_19.

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Kikuchi, D., M. Anyoji, and M. Sun. "A tool for the design of slit and cutoff in schlieren method." In Shock Waves. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85168-4_78.

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Šťastný, M., and K. Pekárek. "Flow Visualization in a Steam Turbine Profile Cascade Using a Colour Schlieren Method." In Optical Methods in Dynamics of Fluids and Solids. Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82459-3_34.

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Suzuki, Shieru, Shun Sasaguri, and Yoichi Ochiai. "Interaction with Objects and Humans Based on Visualized Flow Using a Background-Oriented Schlieren Method." In Lecture Notes in Computer Science. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-78468-3_9.

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Conference papers on the topic "Schlieren method"

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Pierce, Adam, and Frank Lu. "Laser Alignment Method for Portable Schlieren System." In 39th AIAA Fluid Dynamics Conference. American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-3574.

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Nakamura, Yoshio, and Takao Tsuno. "Measurement Of Density Gradient By Pseudo-Colored Schlieren Method." In 18th Intl Congress on High Speed Photography and Photonics, edited by DaHeng Wang. SPIE, 1989. http://dx.doi.org/10.1117/12.969248.

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Li, Yanling, Xin Li, JUN Xu, Zechuan Li, and Jun Wu. "The temperature field measurement method by using schlieren method for aircraft engine." In International Conference on Optical Instruments and Technology 2019: Optoelectronic Measurement Technology and Systems, edited by Jigui Zhu, Hai Xiao, Sen Han, and Kexin Xu. SPIE, 2020. http://dx.doi.org/10.1117/12.2549985.

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Ohno, Hiroshi. "Reconstruction method of gradient-index field with background-oriented schlieren." In Light-Emitting Devices, Materials, and Applications XXIV, edited by Martin Strassburg, Jong Kyu Kim, and Michael R. Krames. SPIE, 2020. http://dx.doi.org/10.1117/12.2546977.

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Harter, Braxton N., Matthew McCrink, and James W. Gregory. "Identification of Lagrangian Coherent Structures using the Background-Oriented Schlieren Method." In AIAA Aviation 2019 Forum. American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-2810.

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Almeida Machado, Danilo, FERNANDO DE SOUZA COSTA, Dermeval Carinhana Jr, and Antonio Carlos de Oliveira. "Visualization of Pulsed Flow of N2O Using the Resonant Schlieren Method." In 18th Brazilian Congress of Thermal Sciences and Engineering. ABCM, 2020. http://dx.doi.org/10.26678/abcm.encit2020.cit20-0210.

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Cwik, A., and H. Ermert. "A quantitative schlieren method for the investigation of axisymmetrical shock waves." In 1993 IEEE Ultasonics Symposium. IEEE, 1993. http://dx.doi.org/10.1109/ultsym.1993.339504.

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Vlad, Ionel V., Nicholas Ionescu-Pallas, and Ion G. Apostol. "Quantitative Schlieren method using digital image processing for supersonic flow characterization." In San Diego '92, edited by Andrew G. Tescher. SPIE, 1993. http://dx.doi.org/10.1117/12.139114.

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Zhou, Zhihong, Haotian Wang, and Huoxing Liu. "Application of Quantitative Monochrome Calibrated Schlieren Technique in Highly-Loaded Turbine Cascade Test." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90342.

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Abstract As the load of the turbine components of aircraft engines continuously increases, shock loss becomes the dominant factor of turbine stage loss and has become a hot topic. Schlieren technique is one of the few effective experimental methods to observe and study shock wave and, thus, has been widely used. Nevertheless, limited by camera accuracy and computer image processing technology, quantitative schlieren analysis methods were difficult to achieve in engineering applications. Fortunately, several quantitative schlieren methods have been developed with the help of new digital technology. Applying schlieren technique to the highly-loaded turbine cascade test is of great significance to the study of shock wave in highly-loaded turbine cascades. In this paper, the results of quantitative density field and shock intensity and loss in the cascade are obtained by using a double reflection type monochrome schlieren device. The boundary condition of density field is obtained by pressure test, and MATLAB software is used as image processing calculation tool. The quantitative results of this paper prove the feasibility of applying quantitative schlieren method to highly-loaded turbine cascade tests. Also, the implemented image processing method and density boundary condition acquisition method are suitable and convenient for cascade flow and shock measurement tests.
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10

Kashitani, Masashi, Yutaka Yamaguchi, and Hideki Kitano. "Preliminary Study for Quantitative Measurement of Flow Fields by Focusing Schlieren Method." In 49th AIAA Aerospace Sciences Meeting including the New Horizons Forum and Aerospace Exposition. American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-983.

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Reports on the topic "Schlieren method"

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Hart, Carl R., and Gregory W. Lyons. A Measurement System for the Study of Nonlinear Propagation Through Arrays of Scatterers. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/38621.

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Various experimental challenges exist in measuring the spatial and temporal field of a nonlinear acoustic pulse propagating through an array of scatterers. Probe interference and undesirable high-frequency response plague typical approaches with acoustic microphones, which are also limited to resolving the pressure field at a single position. Measurements made with optical methods do not have such drawbacks, and schlieren measurements are particularly well suited to measuring both the spatial and temporal evolution of nonlinear pulse propagation in an array of scatterers. Herein, a measurement system is described based on a z-type schlieren setup, which is suitable for measuring axisymmetric phenomena and visualizing weak shock propagation. In order to reduce directivity and initiate nearly spherically-symmetric propagation, laser induced breakdown serves as the source for the nonlinear pulse. A key component of the schlieren system is a standard schliere, which allows quantitative schlieren measurements to be performed. Sizing of the standard schliere is aided by generating estimates of the expected light refraction from the nonlinear pulse, by way of the forward Abel transform. Finally, considerations for experimental sequencing, image capture, and a reconfigurable rod array designed to minimize spurious wave interactions are specified. 15.
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2

Spiwoks, Markus, Zulia Gubaydullina, and Oliver Hein. Gefangen im Hier und Jetzt - Neue Erkenntnisse zum Verhalten von Finanzmarktanalysten. Sonderforschungsgruppe Institutionenanalyse, 2011. http://dx.doi.org/10.46850/sofia.9783941627062.

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Verschiedene Studien geben schon erste Hinweise darauf, dass gegenwartsorientierte Verlaufsanpassungen keine Einzelfälle, sondern möglicherweise der Normalfall bei Finanzmarktprognose-Zeitreihen sein könnten. Allerdings beschränken sich einige dieser Studien auf die Betrachtung von nur wenigen Prognosezeitreihen. Andere Untersuchungen betrachten verhältnismäßig kurze Prognosezeitreihen. Die meisten Studien setzen sich lediglich mit Prognosen zu einzelnen nationalen Finanzmarktsegmenten auseinander. Es fehlt also eine große, international vergleichende Studie, die eine hohe Zahl langer Prognosezeitreihen untersucht. Die vorliegende Untersuchung soll diese Forschungslücke schließen. Im Folgenden werden 158.022 Zinsprognosen in 1.182 Prognosezeitreihen aus zwölf verschiedenen Nationen untersucht. Erst diese umfassende Datenauswertung macht es möglich, zu einer gesicherten Einschätzung darüber zu kommen, wie häufig gegenwartsorientierte Verlaufsanpassungen auftreten. Außerdem wird überprüft, ob es unabhängig vom Prognosehorizont, vom Kapitalmarktsegment und von den betrachteten Ländern zu gegenwartsorientierten Verlaufsanpassungen kommt. Das zweite Kapitel stellt die Datenbasis und die verwendete Methodik vor. Das dritte Kapitel ist der Ergebnisdarstellung vorbehalten. Das vierte Kapitel zeigt mögliche Ursachen für gegenwartsorientierte Verlaufsanpassungen auf. Eine Zusammenfassung findet sich im fünften Kapitel.
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