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dc.contributor.advisorLeonardi, Stefano
dc.contributor.authorVidal Urquiza, Glenn Cooper
dc.date.accessioned2018-05-16T17:08:50Z
dc.date.available2018-05-16T17:08:50Z
dc.date.issued2008-05
dc.identifier.urihttps://hdl.handle.net/20.500.11801/636
dc.description.abstractIn gas turbine combustion system, pollution emissions like CO and NOx produce a hard impact on ecosystem. These emissions are due to combustion instability during which the flame undergoes rapid oscillations and eventually blows out completely. In gas turbine, flame stabilization is often achieved through the use of recirculation zone created by a bluff body usually called ”flamehoder”. A flame holder improves the mixing of hot combustion products with the incoming fuel and air mixture. In the present study, a detailed bluff–body flameholder is studied. Direct Numerical Simulations (DNS) at low Reynolds number have been performed. Various quantities as mean velocities, turbulent fluctuations and static pressures are measured. Behind the flameholder the wake is similar to a Karman Vortex. The pressure distribution around the flame holder shows a high variability corresponding to the oscillation of the streamlines. Visualization of streamlines, pressure contours, rms of velocity are shown in this work.
dc.description.abstractEn los sistemas de combustión de las turbinas de gas, emisiones de contaminantes como CO y NOx producen un duro impacto en el ecosistema. Estas emisiones son debido ha inestabilidad de la combustión, en la cual la flama sufre rápidas oscilaciones y eventualmente produce un completo soplado. En turbinas de gas, la estabilización de la flama es usualmente alcanzado a través de el uso de zonas de recirculación creadas por ”bluff–body”, usualmente llamado ”flameholder”. Flameholder mejora la mezcla de los calientes productos de combustión con la mezcla aire–combustible entrante. En el presente estudio un detallado ”bluff–body flameholder” es estudiado. ”Direct Numerical Simulation” (DNS) para bajos Numeros de Reynolds ha sido llevado a cabo. Varias cantidades tales como, velocidades medias, velocidades instantáneas y presión estática son medidos. Detrás del ”flameholder” la estela es similar al Vortice de Von Karman. La distribución de presión alrededor de el ”flameholder” muestra una alta variabilidad correspondiente a la oscilación de las líneas de corrientes. Visualización de las líneas de corriente, contornos de presión y rms de velocidad son mostrados en este trabajo.
dc.language.isoenen_US
dc.subjectDirect numerical simulationsen_US
dc.subject.lcshGas-turbines--Combustionen_US
dc.subject.lcshFlameen_US
dc.titleTurbulent flow past over a 3-dimensional triangular bluff-body flameholder using direct numerical simulationsen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2008 Glenn Cooper Vidal Urquizaen_US
dc.contributor.committeePandya, R. Vikram Raja
dc.contributor.committeeGutiérrez, Gustavo
dc.contributor.representativeCalderón, Andrés
thesis.degree.levelM.S.en_US
thesis.degree.disciplineMechanical Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.description.graduationYear2008en_US


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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a degree at UPR-Mayagüez.

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