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Effect of Swirl Cup Geometry on Spray Characteristics in Gas Turbine Engine  

김동준 (서울대학교 기계항공공학부)
박종훈 (서울대학교 기계항공공학부)
고현석 (서울대학교 기계항공공학부)
윤영빈 (서울대학교 기계항공공학부)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.6, no.2, 2002 , pp. 29-36 More about this Journal
Abstract
Experiments have been performed to investigate the effect of secondary venturi tip angle on flow and spray characteristics in gas turbine combustor with a swirl cup assembly. Three variations of secondary venturi tip angle are made: converging, straight and diverging angles. It is found that the variation of venturi tip angle results in the significant changes of flow and spray characteristics in gas turbine combustors, such as the size and location of recirculation zones. drop size and mass distribution affecting combustion efficiency and NOx emissions. In diverge case, central toroidal recirculation zone(CTRZ) exists near the exit, which is known to be beneficial for flame stability. But in converge case, the finest SMD distribution and uniform mass distribution are found and CTRZ is longer than other cases. Consequently, high combustion efficiency and low pollutant emission are expected in converge case.
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