Design Optimization and Computational Flow Analysis of Annular Type Combustion Chamber

Abstract

The combustor in a gas turbinemust be designed to efficiently burn the fuel, to diminish the NOx emissions, and to reduce the chamber inner wall temperatures. The analysisinvestigates following parameters such asfuel-air ratio, air inlet swirl angle, dilution zone holesaxial positionisoptimizedand effective performance of annular combustorand gasses emissions.thedesign models used for combustion consists of eddy dissipation, the PDF flame letcombustion model for combustion at non-premixed gas. The results of this work will serveinoptimize the combustor geometry which leads to emit lessNOxgasses.Annular combustors consists of individual cylindrical combustion chambers. It consists of fuel injector, igniter, liner, and casing. The primary air from the compressor is guided into annulus area of the combustor, decelerated  and tends to rise in static pressure, mixed with the fuel, and started initiation of burning. The secondary air also bleeds from the compressor liner passagesand get mixed with primary air. The slits in the combustor liner, now forces the coolant into the tertiary zone to cool the liner.The state-of-the-art annular combustion chamber for defense utilizing the fuel injection at low-pressure provided with vortex air swirlers, mix fuel and the air discharged from the compressor. The fuel injectorsplacedin concentric to the inner surface of the chamber. The swirlers placed through the circumference of the chamberinterruptions fuel particles.In recent years,the combustion initiation is a problem regarding the annular combustor,the sizeand engine overall performance. Therefore,the present analysis is carried out in such a way to achieve engine size reduction by providing swirl vanes to the inner surface can reduce the Out letting incombustible products and further NOx emissions from the engine. This computational investigationdone by comparing basic type of annular combustor and modified annular combustor design with required changes made in the design and the flow contours are plotted for various parameters using ANSYS ICEM CFX.