Relevant bibliographies by topics / Shawn Vanden

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Academic literature on the topic 'Shawn Vanden'

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

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Journal articles on the topic "Shawn Vanden"

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Sha, Huyun, and J. M. Vanden-Broeck. "Internal solitary waves with stratification in density." Journal of the Australian Mathematical Society. Series B. Applied Mathematics 38, no. 4 (April 1997): 563–80. http://dx.doi.org/10.1017/s0334270000000862.

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AbstractLong periodic waves propagating in a closed channel are considered. The fluid consists of two layers of constant densities separated by a layer in which the density varies continuously. The numerical results of Vanden-Broeck and Turner [8] are extended. It is shown that their solutions are particular members of a family of solutions. Solutions are selected by requiring that the streamfunction takes values on the upper and lower walls which are consistent with a uniform stream far upstream. The new solutions are qualitatively similar to those of Vanden-Broeck and Turner [8]. In particular, there are periodic waves characterized by a train of ripples at their troughs. It is shown numerically that these waves approach solitary waves with oscillatory tails as their wavelength increases. Moreover special solutions for which the amplitude of the ripples is almost zero are identified. Such solutions without ripples were previously found for solitary waves with surface tension.
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Dzemydienė, Dalė, Saulius Maskeliūnas, and Kim Jacobsen. "SUSTAINABLE MANAGEMENT OF WATER RESOURCES BASED ON WEB SERVICES AND DISTRIBUTED DATA WAREHOUSES / DARNUS VANDENS IŠTEKLIŲ VALDYMAS TINKLO PASLAUGŲ IR IŠSKIRSTYTŲ DUOMENŲ SAUGYKLŲ PAGRINDU." Technological and Economic Development of Economy 14, no. 1 (March 31, 2008): 38–50. http://dx.doi.org/10.3846/2029-0187.2008.14.38-50.

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Sustainable management of water resources is multidimensional and complex process often requires the incorporation of efforts of many impacts and responsibilities of concerning institutions. This research work is devoted for developing of web service based Water Resource Management Information System (WRMIS). The WRMIS has been developed in accordance with the European Union Water Framework Directive and EIONET ReportNet infrastructure requirements to environmental water sector reporting by EU member states. It is realised as a web portal where users can receive information on environmental water sector, combining data from the participating data warehouses and giving an opportunity to extract useful information by the available functions and tools. The WRMIS portal allows the access to information of data warehouses on the surface water quality in rivers and lakes, ground water, and point sources (emissions). A detailed description of the main components of the Water Resource Management Information System is given, the advantages of Web Service‐based solution are presented, and the direction of a further WRMIS development in the future is shown. Santrauka Vandens išteklių valdymas reikalauja daugiakriterinių, kompleksinių šio sudėtingo proceso darnaus valdymo uždavinių sprendimo, pasitelkiant daugelio institucijų darbo pastangas ir atsakomybę. Mokslinio tiriamojo darbo tikslas – sukurti tinklo paslaugomis grindžiamą vandens išteklių valdymo infrastruktūrą, kuria remiantis būtų integruota bendra vandens išteklių valdymo informacinė sistema. Straipsnyje aprašoma vandens išteklių valdymo sistema, kuriama pagal Europos Sąjungos Vandens išteklių valdymo direktyvos ir EIONET ReportNet tinklo valdymo infrastruktūros reikalavimus, vykdant Europos Sąjungos šalių narių aplinkos apsaugos įsipareigojimus vandens sektoriuje. Sistema yra realizuojama kaip interneto portalas, integruojantis dalyvaujančių šalių duomenų saugyklas ir dinamiškai valdomus atitinkamus įrankius ir funkcijas. Šios tinklo paslaugos leidžia vartotojams gauti informaciją apie aplinkos vandens išteklių valdymą, vandens sudėtį, išgaunamus ir išleidžiamus vandens kiekius. Portale realizuojamos paslaugos, leidžiančios gauti informaciją apie paviršinio vandens kokybę upėse ir ežeruose, giluminio vandens ir atskirų taškų išteklius, jų emisijas. Straipsnyje pateikiamas detalus pagrindinių vandens išteklių valdymo sistemos komponentų aprašas ir numatomos šios sistemos plėtros perspektyvos.
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BINDER, B. J., J. M. VANDEN-BROECK, and F. DIAS. "On satisfying the radiation condition in free-surface flows." Journal of Fluid Mechanics 624 (April 10, 2009): 179–89. http://dx.doi.org/10.1017/s0022112008005028.

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Binder & Vanden-Broeck (2005) showed there are no subcritical or critical solutions satisfying the radiation condition for steady flows past a flat plate. By using a weakly nonlinear analysis, it is shown that such flows exist for a curved plate. Fully nonlinear solutions are computed by a boundary integral equation method, and new nonlinear solutions for supercritical and generalized critical flows past a curved plate are presented.
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Keeports, David. "A Map-coloring Algorithm." Mathematics Teacher 84, no. 9 (December 1991): 759–63. http://dx.doi.org/10.5951/mt.84.9.0759.

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Among the most tantalizing propositions of mathematics are those generalizations that are easily and concisely stated and are readily shown to be true for specific cases yet, despite their apparent simplicity, defy concise proof. Outstanding examples of such propositions include Fermat's last theorem (see Vanden Eynden [1989]), the Goldbach conjecture, and the four-color theorem. Because such propositions can be understood by students with almost no previous background in mathematics, they are easily introduced in mathematics courses intended for the liberal arts student.
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VANDEN-BROECK, JEAN-MARC. "Local gravity-capillary flows near the intersection of a free surface with a vertical wall." European Journal of Applied Mathematics 8, no. 2 (April 1997): 177–84. http://dx.doi.org/10.1017/s0956792597003008.

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Local solutions near the intersection of a free surface with a vertical wall are constructed numerically. Both gravity and surface tension are included in the dynamic boundary condition. It was shown that the solutions are characterized by the angle γ between the free surface and the wall at the separation point. There is a solution for each value of π/2<γ<π. As γ→π/2 and γ→π, the solutions reduce to the pure gravity solutions of Vanden-Broeck & Tuck [1].
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Zlokazov, Kirill V. "Representation of value and meaning in the structure of vandalism: an empirical study." Vestnik of Kostroma State University. Series: Pedagogy. Psychology. Sociokinetics 26, no. 4 (February 24, 2021): 80–85. http://dx.doi.org/10.34216/2073-1426-2020-26-4-80-85.

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The article is devoted to predicting and preventing urban vandalism. In the article described current state of research on structure of vandalism – motives, attitudes, ideas. It is shown that the activity approach can serve as a theoretical basis for study of the internal plan of vandal actions. On its basis, a theoretical model is determined, including the motive of vandalism and the ideas that regulate its implementation. These are the subjective value of vandal action and value that subject attaches to vandal action. The organisation, procedure and results of empirical research are described. Using a sample of young people living in 106 Russian cities (n = 650 people), we study the relationship between subjective ideas about the ability to commit a vandal act, its motives, attributed value and meaning. The results show that there is a conjugate effect of these representations on subjective ability to behave like a vandal. Their interpretation shows the presence of opposite approaches to the assessment of vandalism – from rejection to acceptance.
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Butkutė, Simona, and Aušra Zigmontienė. "EVALUATION OF BIOGENIC SUBSTANCES IN THE RIVER ŠVENTOJI / BIOGENINIŲ MEDŽIAGŲ KONCENTRACIJŲ NERIES INTAKE ŠVENTOJOJE VERTINIMAS." Mokslas - Lietuvos ateitis 5, no. 4 (November 25, 2013): 342–48. http://dx.doi.org/10.3846/mla.2013.55.

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The article discusses the influence and main causes of nutrient compounds in surface waters. The article is aimed at investigating changes in nutrients – nitrogen and its compounds in the river Šventoji. The samples of analysis were collected in the town of Anykščiai in order to assess the influence of the stream of the Anykšta and waste water treatment. The largest concentrations of nutrients were identified from waste water treatment; however, it had not exceeded the MAC, except for February 2012. The conducted analysis has shown that the river Šventoji belongs to the class of a high ecological status, because physic – chemical quality elements such as nitrate – nitrogen (0,60 mg/l) and ammonium – nitrogen (0,03 mg/l) have not exceeded the range <1,30 mg/l and 0,10 mg/l. Article in Lihuanian. Santrauka Straipsnyje nagrinėjama biogeninių medžiagų įtaka paviršiniams vandens telkiniams ir pagrindinės šių medžiagų atsiradimo priežastys. Tyrimo tikslas – azoto turinčių biogeninių medžiagų – nitritų, nitratų, amonio koncentracijų Šventosios vandenyje analizė. Mėginiai buvo imti Anykščiuose ir už miesto ribų, įvertinta Anykštos upelio, komunalinių nuotekų valyklos įtaka Šventosios vandens užterštumui. Didžiausi biogeninių medžiagų kiekiai Šventojoje nustatyti už nuotekų valyklos, tačiau jie neviršijo DLK, išskyrus sausį. Pagal fizikinius-cheminius kokybės elementus – nitratų azotą (0,60 mg/l) ir amonio azotą (0,03 mg/l) Šventoji atitinka labai geros ir geros ekologinės būklės klasę, nes jos vandens kokybės reikšmės patenka atitinkamai į <0,10 mg/l ir 1,30–2,30 mg/l reikšmių intervalą.
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Smith, Peter H. "Dvořák and Subordinate Theme Closure." Journal of Music Theory 64, no. 2 (October 1, 2020): 203–40. http://dx.doi.org/10.1215/00222909-8550783.

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Form theorists have shown increasing interest in applying the methodologies of Caplin and of Hepokoski and Darcy to sonata forms of the nineteenth century. Many of these efforts proceed under the assumption that late eighteenth-century norms continued to influence Romantic sonata form even in the face of nineteenth-century innovations. Vande Moortele contrasts this “negative” approach to an as-yet-unrealized “positive” theory that would derive its concepts directly from nineteenth-century music. A multipart strategy interrogates the positive methodology championed by Vande Moortele and such like-minded theorists as Horton and Wingfield. Examination of Horton’s recent analysis of Brahms’s First Symphony reveals the unacknowledged presence of classical norms casting a “negative” light—although an essential and beneficial one—on his presumably “positive” methodology. A corpus study of subordinate theme closure in Dvořák’s mature chamber music responds both to Horton’s interest in asynchrony between formal design and tonal structure and to his and Vande Moortele’s calls for expanding the range of composers included in these endeavors. Attention to a less studied composer betrays the persistent gravitational pull of classical conventions, in contrast to Horton’s and Vande Moortele’s argument that a Romantic-centered corpus would tend to diminish that pull. Detailed analyses of select Dvořák movements focus on subordinate theme closure but also embrace broader concerns, such as form-functional contrast among P, S, C, and coda; characteristics that signal end-of-the-beginning versus end-of-the-end functions for cadences; the interaction of tonal pairing and formal design; and Dvořák’s recapitulatory reinterpretations of his expositional strategies. The analyses illustrate limitations of corpus study as contrasted with close reading of individual movements. The close readings underscore the need to engage both circumpolar norms and progressive linear developments, even in music written in the last decades of the nineteenth century.
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Mykolaitis, Egidijus, Andrius Styra, and Vladas Vekteris. "INVESTIGATION OF SOLID PARTICLES UNDER THE ACTION OF AN ACOUSTIC FIELD / SKYSTYJE ESANČIŲ KIETŲJŲ DALELIŲ SĄVEIKOS AKUSTINIAME LAUKE TYRIMAS." Mokslas - Lietuvos ateitis 5, no. 6 (December 31, 2013): 655–58. http://dx.doi.org/10.3846/mla.2013.109.

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Iron is one of the most common elements in ground water. Bythe HN 24:2003 iron concentration in water can‘t be higher than200 μg/l. Water treatment with an acoustic field is a very relevanttopic. Acoustic field is widely used in industrion, medicine,chemical industry and manufacturing. When water is affectedby ultrasound, physical-chemical processes begin. Ultrasoundvibrations lead to dispersion, degasation and coagulation. Ironparticles connect to each other when distance between them istwo times bigger then their own radius. R = 2R. And if thisprocess continues particles connect one by one. In this article teststand and methodics using ultrasonic piezoceramic are shown. Santrauka Geležis – dažniausiai požeminiuose vandenyse aptinkama priemaiša, kuri prastina geriamojo vandens savybes, todėl būtina bendrosios geležies koncentraciją sumažinti iki 0,2 mg/l. Vienas iš geležies šalinimo būdu yra paremtas ultragarso panaudojimu. Straipsnyje glaustai aptarti bendrosios geležies būviai vandenyje, jos šalinimo metodai ir pateikta eksperimentinė metodika. Eksperimentas atliktas naudojant skirtingų dažnių garso bangas nuo 8 kHz iki 20 kHz diapazone. Akustinio lauko daromai įtakai nustatyti, naudojant skirtingų dažnių garso bangas, buvo panaudoti trys skirtingi vandens debitai. Iš gautų rezultatų suformuluotos išvados.
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Povilaitis, Arvydas, and Erik P. Querner. "POSSIBILITIES TO RESTORE NATURAL WATER REGIME IN THE ŽUVINTAS LAKE AND SURROUNDING WETLANDS ‐ MODELLING ANALYSIS APPROACH/NATŪRALAUS VANDENS REŽIMO ŽUVINTO EŽERE IR APLINKINĖSE PELKĖSE ATKŪRIMO ANALIZĖ TAIKANT MATEMATINĮ MODELIAVIMĄ/ AНAЛИЗ ВОССТАНОВЛЕНИЯ ВОДНОГО РЕЖИМА В ОЗЕРЕ ЖУВИНТАС И ОКРУЖАЮЩИХ БОЛОТАХ С ПОМОЩЬЮ МЕТОДА МАТЕМАТИЧЕСКОГО МОДЕЛИРОВАНИЯ." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 16, no. 3 (September 30, 2008): 105–12. http://dx.doi.org/10.3846/1648-6897.2008.16.105-112.

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The Žuvintas Lake, located in southern Lithuania in the basin of the Dovine River is one of the biggest lakes and the oldest natural reserves of the country. However, the changes in the hydrology of the Dovine River basin, caused by large‐scale melioration and water management works carried out in the 20th century, have resulted in significant alteration of hydrological regime and decrease in biodiversity of the Žuvintas Lake and surrounding wetlands. In order to prevent the ongoing deterioration of the Lake and wetlands solutions have to be found. Therefore, various scenarios have been analysed to evaluate the impact of water management alternatives. For these scenarios the physically‐based distributed parameter model SIMGRO was used. The results have shown that natural water regime in the Žuvintas Lake is hardly reversible. However, the replacement of sluice‐gates implemented at the outlet of the Žuvintas Lake by overflow weir as well as the blocking of drainage ditches and the removal of scrubs and trees in the wetlands surrounding the Lake can be highly successful measures to improve hydrological conditions. Santrauka Dovinės upės (dešinysis Šešupės upės intakas) baseine yra seniausias Lietuvoje Žuvinto biosferos rezervatas ir kitos europinės svarbos saugomos teritorijos. Tose vietose hidrologinis režimas tiesiogiai reguliuojamas šešiose vietose pastatytais reguliavimo šliuzais. Šiuo metu poreikio reguliuoti nėra, todėl darbe analizuojamos natūralaus vandens režimo atkūrimo galimybės Žuvinto ežere ir aplinkinėse pelkėse. Tam buvo taikytas matematinio modeliavimo metodas naudojant pasiskirsčiusių parametrų SIMGRO modelį. Ankstesni tyrimai parodė, kad atkurti natūralų hidrologinį režimą vien panaikinus reguliavimo šliuzą žemiau Žuvinto ežero, negalima. Tai sunaikintų ežerą ir neigiamai paveiktų požeminio vandens režimą Žuvinto ir Amalvos pelkių komplekse. Siekiant bent dalinio vandens režimo natūralizavimo reguliavimo šliuzą siūloma rekonstruoti į slenkstinę nuopylą įrengiant žuvitakį. Žuvinto ir Amalvos pelkių masyve požeminio vandens režimui pagerinti rekomenduojama pašalinti ten augančią sumedėjusią augaliją ir apypelkio teritorijose patvenkti melioracijos griovius. Pateikiamas tokių priemonių galimas poveikis Žuvinto ežero ir aplinkinių pelkių hidrologiniam režimui. Peзюме Водный режим бассейнa реки Довине в южной части Литвы в прошлом столетии был подвержен важным изменениям. Там находится старый заповедник Литвы – озеро Жувинтас c близлежащими болотaми. В статье представлен сценарий по восстановлению водного режима в озере Жувинтас и окружающих болотах. Для исследования была применена математическая модель SIMGRO. Результаты показали, что полное восстановление гидрологического режима в озере невозможно. Для улучшения водного режима предложен ряд мер.
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Books on the topic "Shawn Vanden"

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Hinton, Alexander Laban. Aesthetics (Theary Seng, Vann Nath, and Victim Participation). Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198820949.003.0007.

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The second part of the book, “Turbulence,” centers on the transitional justice encounter of three survivors (Theary Seng, Vann Nath, and Bou Meng) involved in victim participation at the Extraordinary Chambers in the Courts of Cambodia (ECCC). Chapter 4, for example, is loosely structured around the idea of aesthetics and the experience of two victims who participated in the proceedings, Theary Seng and former S-21 prisoner Vann Nath. If the 2008 reenactment highlighted the performative dimensions of the transitional justice imaginary, it also suggested an implicit aesthetics as a former prison that had been converted into a genocide museum was, in this moment, envisioned as a crime site now inhabited by court personnel, victims and witnesses, and defendant, and evidence. The ECCC has a similar aesthetics of justice, ranging from court regalia and symbols to courtroom demeanor, technologies, styles of speech and movement, and public participation. The first part of the chapter centers on the experience of the first civil party, Theary Seng. Originally skeptical of the ECCC, Seng came to believe it had transformative possibilities in terms of promoting democracy in Cambodia. To this end, in a series of pretrial hearings, she sought to speak directly in court. Initially successful, Seng was eventually silenced as the Pre-Trial Chamber ruled that civil parties could only speak through their lawyers. Seng, for her part, became increasingly critical of the court, stating that she refused to be a piece of “décor” in a “sham.” Eventually she would renounce her civil party status and become an outspoken critic of the court, which was increasingly beset by controversy. The remainder of the chapter focuses on Vann Nath’s Case 001 testimony. On the day of his testimony, the 500-seat courtroom was packed, as it would be during many subsequent trial sessions. Vann Nath’s art, much of which he had produced during People’s Republic of Kampuchea for display at Tuol Sleng, was reintroduced as juridical evidence and shown in court. The chapter explores some of these aesthetic dimensions of the transitional justice imaginary even as it considers the lived experience and practices that informed Vann Nath’s art, including Buddhist aesthetics and beliefs.
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Book chapters on the topic "Shawn Vanden"

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Rana, Kamlesh Kumar, Vishnu Sharma, Vishal Jain, Sanjoy Das, Gagan Tiwari, and Vikram Bali. "Directional Location Verification and Routing in Vehicular Ad-Hoc Network." In IoT and Cloud Computing Advancements in Vehicular Ad-Hoc Networks, 1–20. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-2570-8.ch001.

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Vehicular ad-hoc network (VANET) is an autonomous system of mobile vehicles in which vehicles are a source of information. In VANET, direct communication between vehicles provides high-level safety and hassle-free drive. Large moving vehicles such as trucks or buses may affect direct communication of vehicles as a nonline of sight (NLOS) may occur. NLOS restricts direct communication of vehicles. Even the corresponding vehicle is within the communication range of the communicating vehicle. To overcome the NLOS problem and verify the location of the vehicles, this chapter has presented a routing mechanism, namely Directional Location Verification and Routing (DLVR) in Vehicular Ad-hoc Network. DLVR model prevents the false location information of the nodes by reduced packet drop and increased packet delivery ratio. Before transmitting data packets DLVR verifies data packets through reliability check. Through simulation work, it has shown the proposed DLVR model reduced packet drop and increased packet delivery ratio which increases the network performance.
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Brock, Fred V., and Scott J. Richardson. "Anemometry." In Meteorological Measurement Systems. Oxford University Press, 2001. http://dx.doi.org/10.1093/oso/9780195134513.003.0009.

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The function of an anemometer (sometimes with a wind vane) is to measure some or all components of the wind velocity vector. It is common to express the wind as a two-dimensional horizontal vector since the vertical component of the wind speed is usually small near the earth’s surface. In some cases, the vertical component is important and then we think of the wind vector as being three-dimensional. The vector can be written as orthogonal components (u, v, and sometimes w] where each component is the wind speed component blowing in the North, East, or vertically up direction. Alternatively, the vector can be written as a speed and a direction. In the horizontal case, the wind direction is the direction from which the wind is blowing measured in degrees clockwise from North. The wind vector can be expressed in three dimensions as the speed, direction in the horizontal plane as above, and the elevation angle. Standard units for wind speed (a scalar component of the velocity) are m s-1 and knots (nautical miles per hour). Some conversion factors are shown in table 7-1. Wind velocity is turbulent; that is, it is subject to variations in speed, direction, and period. The wind vector can be described in terms of mean flow and gustiness or variation about the mean. The WMO standard defines the mean as the average over 10 minutes. The ideal wind-measuring instrument would respond to the slightest breeze yet be rugged enough to withstand hurricane-force winds, respond to rapidly changing turbulent fluctuations, have a linear output, and exhibit simple dynamic performance characteristics. It is difficult to build sensors that will continue to respond to wind speeds as they approach zero or will survive as wind speeds become very large. Thus a variety of wind sensor designs and, even within a design type, a spectrum of implementations have evolved to meet our needs.
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"Some of these could also be operated in the energy range above lOMeV for experiments designed to determine at which energy level radioactivity can be induced in the irradiated medium. A linac with a maximum energy of 25 MeV was commissioned for the U.S. Army Natick Research and Development Labora­ tories in 1963. Its beam power was 6.5 kW at an electron energy of 10 MeV, 18 kW at 24 MeV. Assuming 100% efficiency, a 1-kW beam can irradiate 360 kg of product with a dose of 10 kGy/h. The efficiency of electron accelerators is higher than that of gamma sources because the electron beam can be directed at the product, whereas the gamma sources emit radiation in all directions. An efficiency of 50% is a realistic assumption for accelerator facilities. With that and 6.5 kW beam power an accelerator of the type built for the Natick laboratories can process about 1.2t/h at 10 kGy. In Odessa in the former Soviet Union, now in the Ukraine, two 20-kW accelerators with an energy of 1.4 MeV installed next to a grain elevator went into operation in 1983. Each accelerator has the capacity to irradiate 200 t of wheat per hour with a dose of 200 Gy for insect disinfestation. This corresponds to a beam utilization of 56% (9). In France, a facility for electron irradiation of frozen deboned chicken meat commenced operation at Berric near Vannes (Brittany) in late 1986. The purpose of irradiation is to improve the hygienic quality of the meat by destroying salmonella and other disease-causing (pathogenic) microorganisms. The electron beam accelerator is a 7 MeV/10 kW Cassitron built by CGR-MeV (10). An irradiation facility of this type is shown in Figure . Because of their relatively low depth of penetration electron beams cannot be used for the irradiation of animal carcasses, large packages, or other thick materials. However, this difficulty can be overcome by converting the electrons to x-rays. As indicated in Figure 9, this can be done by fitting a water-cooled metal plate to the scanner. Whereas in conventional x-ray tubes the conversion of electron energy to x-ray energy occurs only with an efficiency of about %, much higher efficiencies can be achieved in electron accelerators. The conversion efficiency depends on the material of the converter plate (target) and on the electron energy. Copper converts 5-MeV electrons with about 7% efficiency, 10-MeV electrons with 12% efficiency. A tungsten target can convert 5-MeV electrons with about 20%, 10-MeV electrons with 30% efficiency. (Exact values depend on target thickness.) In contrast to the distinct gamma radiation energy emitted from radionuclides and to the monoenergetic electrons produced by accelerators, the energy spectrum of x-rays is continuous from the value equivalent to the energy of the bombarding electrons to zero. The intensity of this spectrum peaks at about one-tenth of the maximum energy value. The exact location of the intensity peak depends on the thickness of the converter plate and on some other factors. As indicated in Figure." In Safety of Irradiated Foods, 40. CRC Press, 1995. http://dx.doi.org/10.1201/9781482273168-31.

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Conference papers on the topic "Shawn Vanden"

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Boyle, Robert J., Ankur H. Parikh, Michael C. Halbig, and Vinod K. Nagpal. "Design Considerations for Ceramic Matrix Composite Vanes for High Pressure Turbine Applications." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95104.

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Issues associated with replacing conventional metallic vanes with Ceramic Matrix Composite(CMC) vanes in the first stage of the High Pressure Turbine(HPT) are explored. CMC materials have higher temperature capability than conventional HPT vanes, and less vane cooling is required. The benefits of less vane coolant are less NOx production and improved vane efficiency. Comparisons between CMC and metal vanes are made at current rotor inlet temperatures and at an vane inlet pressure of 50 atm.. CMC materials have directionally dependent strength characteristics, and vane designs must accommodate these characteristics. The benefits of reduced NOx and improved cycle efficiency obtainable from using CMC vanes. are quantified Results are given for vane shapes made of a two dimensional CMC weave. Stress components due to thermal and pressure loads are shown for all configurations. The effects on stresses of: (1) a rib connecting vane pressure and suction surfaces; (2) variation in wall thickness; and (3) trailing edge region cooling options are discussed. The approach used to obtain vane temperature distributions is discussed. Film cooling and trailing edge ejection were required to avoid excessive vane material temperature gradients. Stresses due to temperature gradients are sometimes compressive in regions where pressure loads result in high tensile stresses.
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Srivastava, R., J. Panovsky, R. Kielb, L. Virgin, and K. Ekici. "Non-Linear Flutter in Fan Stator Vanes With Time Dependent Fixity." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22555.

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A new mechanism for fan stator vane failure in turbofan engines at high speed and high loading has been identified and reported in this paper. Highly destructive vane failures have been encountered at Honeywell in one of the development fans with composite stator vanes. Measured data indicated nonlinear high amplitude vibratory response in fan stator vanes on stall side of the fan map at high speeds. Analysis showed that under certain vane steady loading vane fixity at hub could change, significantly reducing the vane natural frequency. At lower natural frequency the vane was found to be aeroelastically unstable and calculated response exhibited behavior observed during failure. An engine test was conducted to validate the role of hub fixity in vane failures. Test results showed failure to be a self-excited phenomenon and not driven by an external source of excitation. It was also shown that failures occur in vanes that are not rigidly fixed, validating the role of hub fixity in vane failures. Test results along with the analysis confirm the role of time dependent hub fixity leading to the highly destructive flutter responsible for vane failures.
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3

Vikhorev, Valentin, Valery Chernoray, Oskar Thulin, Srikanth Deshpande, and Jonas Larsson. "Detailed Experimental Study of the Flow in a Turbine Rear Structure at Engine Realistic Flow Conditions." In ASME Turbo Expo 2020: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/gt2020-15734.

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Abstract A good aerodynamic design of the turbine rear structure (TRS) is crucial for improving efficiency and reducing emissions from aero-engines. This paper presents a detailed experimental evaluation of an engine realistic TRS which was studied in an engine-realistic rig at Chalmers University of Technology, Sweden. The TRS test section was equipped with three types of outlet guide vanes (OGVs) which are typical of modern state-of-the-art TRS: regular vanes, thickened vanes and vanes with an engine mount recess (a shroud bump). Each of the three vane geometries were studied under on-design and off-design conditions at a fixed flow Reynolds number of 235,000. The study shows that the off-design performance of the TRS strongly depends on the presence of the local flow separation on the OGV suction side near the hub, which is greatly affected by the vane pressure distribution and inlet conditions. Similarly, the OGVs with increased thickness and with a vane shroud bump are shown to affect the performance of the TRS by influencing the losses on the OGV suction side near the hub. Furthermore, the presence of the bump is shown to have noticeable upstream influence on the outlet flow from the low-pressure turbine and noticeable downstream influence on the outlet flow from the TRS.
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Jacobi, Simon, and Budimir Rosic. "Influence of Combustor Flow With Swirl on Integrated Combustor Vane Concept Full-Stage Performance." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63785.

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The integrated combustor vane concept for power generation gas turbines with can combustors has been shown to have significant benefits compared to conventional nozzle guide vanes. Aerodynamic loss, heat transfer levels and cooling requirements are reduced while stage efficiency is improved by approximately 1.5% (for a no-swirl scenario). Engine realistic combustor flow with swirl however leads to increased turning non-uniformity downstream of the integrated vanes. This paper thus illustrates the altered integrated vane stage performance caused by inlet swirl. The study shows a distinct performance penalty for the integrated vane rotor as a result of increased rotor incidence and the rotor’s interaction with the residual swirl core. The stage efficiency advantage of the integrated combustor vane concept compared to the conventional design is thus reduced to 0.7%. It is furthermore illustrated how integrated vane profiling is suitable to reduce the turning variation across the span downstream of the vane, further improve stage efficiency (in this case by 0.23%) and thus mitigate the distinct impact of inlet swirl on integrated vane stage performance.
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McNichols, Ezra O., Scott M. Jones, Arman Mirhashemi, Paht Juangphanich, and Vikram Shyam. "Preliminary Study of Heat Pipe Turbine Vane Cooling in the NASA N+3 Reference Engine." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59352.

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Abstract This paper investigates the effects of implementing Heat Pipe Turbine Vane (HPTV) cooling in the NASA N+3 engine. The HPTV can be thought of as a heat pipe in the shape of a turbine vane, functioning as both an aerodynamic body and heat exchanger. The heat-absorbing section of the HPTV remains fixed in the vanes of the high-pressure turbine (HPT), while the heat-rejecting section can be placed in any stage of the low pressure turbine (LPT) as well as the bypass stream. The optimal location of the condensing (heat-rejecting) section is shown to be in the bypass stream for both HPT stages. The thrust-specific fuel consumption (TSFC) increased by 0.2%, which is mainly attributed to the elimination of air cooling in the second stage HPT vanes combined with the transfer of energy from the main gas path to elsewhere in the cycle. Air cooling is also eliminated in the first stage HPT vanes, but this cooling air is nonchargeable. A preliminary design is proposed and shown to demonstrate the desired performance and operates below the heat flux limitations of the heat pipe.
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Culley, Dennis E., Michelle M. Bright, Patricia S. Prahst, and Anthony J. Strazisar. "Active Flow Separation Control of a Stator Vane Using Surface Injection in a Multistage Compressor Experiment." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38863.

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Active flow control has been applied to the suction surface of stator vanes in a low speed axial compressor. Injection from the suction surface has been shown to reduce separation on vanes that were induced to separate by increasing the vane stagger angle by 3°. Various configurations were investigated including injector geometry (slots versus holes) and type of injection (steady versus unsteady). Unsteady injection was realized using two different approaches; external actuation through a high frequency valve and embedded actuation using a fluidic device internal to the vane. Using total pressure loss through the vane passage as a metric, reductions in area-averaged loss of 25% were achieved using injected massflow rates on the order of 1% of compressor through flow. The development of a tracking control algorithm was also explored for the purpose of closed-loop control. A reliable method of detecting surface separation was implemented using unsteady pressure measurements on the compressor casing near the vane suction surface.
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Simpson, Alister, Stephen W. T. Spence, David W. Artt, and Geoffrey McCullough. "Experimental and Numerical Investigation of Varying Stator Design Parameters for a Radial Turbine." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-90152.

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The experimental and numerical investigations of five different vaned stators for a radial turbine are reported. Three different stator vane numbers and three different vane shapes were tested and modelled. The experimental tests were conducted at matched mass flow rates and pressure ratios, using the same 86 mm diameter turbine rotor, allowing direct comparison of the losses arising from each stator configuration. Stator vane number was found to have a small impact on measured stage efficiency (less than 1%), while vane shape was found to have a more significant effect (up to 4%). A commercial CFD code was used to construct a combination of full stage and single passage numerical models of the test turbine. Flow separation as a result of excessive incidence angle at stator inlet was shown to be a significant factor for some of the stators. Predicted pressure loss coefficients for the vaned stators were in the range 7–11%.
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Fan, Honggang, Qingfeng Ji, Weili Liao, and Haixia Yang. "Flow Analysis of the Guide Vanes Region of Pump Turbine at the Slight Opening in the Pumping Startup Process." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7739.

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The unit of a Pumped Storage Power Station experienced abnormal noise and vibration in the guide vanes at the slight opening when the pump turbine was in the process of startup in the pumping mode. Based on this phenomena, the three dimensional model of the pump turbine was established, RNG k-epsilon two equations turbulence model was selected for the flow numerical simulation in the pump turbine because this model can simulate both the flow separation and vortex dynamics, and it is more accurate in the near wall areas. The governing equations were discretized with the finite volume method. The computation was carried out with three steps, 1.steady calculation, 2.unsteady calculation with constant guide vane opening, 3.unsteady calculations with the increase of the opening of guide vanes, by using the results of the last step as the initial condition. According to the three dimensional simulation results, the main flow between the guide vanes was deflected from attaching to the one vane to the other vane with the opening of the guide vanes. The calculation of complete 3D flow indicated that the deflections of the flows between the different adjacent guide vanes were basically the same, however, the deflections starting times had a few differences. The variation of the torque on the guide vane was also investigated, and the results shown the abrupt changes occurred during the deflection process of the main flow. When the torque produced by the servomotor cannot adapt quickly enough to the abrupt changes, the vibration and loud scrape noise might occur.
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Ni, Qifeng, Anping Hou, Ye Tian, Quanyong Xu, and Enlai Liu. "Design of a Single-Stage Centrifugal Compressor and Numerical Investigation of Simultaneous Adjustment of Inlet Guide Vanes and Diffuser Vanes." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65383.

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A single stage centrifugal compressor has been designed for industrial use. Adjustable Inlet Guide Vanes (IGVs) and vaned diffusers were equipped to meet the requirement of large flow range, high efficiency and constant shaft speed. Both numerical calculations and experiments were implemented to get the performance of this new designed centrifugal compressor. The influence of adjustable IGVs and vaned diffusers on the stage performance characteristic was examined by numerical method. It is shown that numerical simulation results are close to the measured results and predict the stall limit well. The new centrifugal compressor has a comparatively high efficiency and wide operating range. Moreover, unilateral adjustment of either IGV pre-whirl angle or vaned diffuser stagger angle enables an increase in stable operating range opposed to the stage configuration with no adjustment. The combination of simultaneous adjustment of the IGVs and diffuser vanes can not only provide even wider flow range but also keep high efficiency. The identical working point can be operated at different IGV pre-whirl angles and diffuser stagger angles, hence the optimum adjustment schedule for the specified operating line was dug up to obtain an optimum efficiency. Detailed flow field analysis was performed to validated the suitable simultaneous adjustment combinations.
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Hohlweg, William C., Gregory L. Direnzi, and Ronald H. Aungier. "Comparison of Conventional and Low Solidity Vaned Diffusers." In ASME 1993 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/93-gt-098.

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Test results are presented comparing the aerodynamic performance of single stage centrifugal compressors with thin flat plate, low solidity vaned diffusers to conventional thin vaned diffusers. The test data were acquired from a low Mach number process gas compressor and a high Mach number industrial air compressor. The data are all normalized relative to baseline vaneless diffuser results. Performance parameters of stability, head rise to surge, overload flow margin, and stage efficiency are compared. The low solidity vane inlet incidence angle is shown to be an important design parameter that influences both compressor operating range and efficiency.
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