Breakup Mechanism of a Jet in the L-Shape Crossflow of a Gas Turbine Combustor

Myeung Hwan Choi, Jeongwoo An and Jaye Koo
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Myeung Hwan Choi: Graduate School, Korea Aerospace University, Goyang 10540, Korea
Jeongwoo An: Department of Smart Air Mobility, Korea Aerospace University, Goyang 10540, Korea
Jaye Koo: School of Aerospace Mechanical Engineering, Korea Aerospace University, Goyang 10540, Korea

Energies, 2022, vol. 15, issue 9, 1-22

Abstract: Experimental investigations are conducted to determine the mechanism and characteristics of a jet in an L-shape crossflow simulating the radial swirl injector of a lean premixed-prevaporized (LPP) combustor. To simplify the radial flow of the actual injector while ignoring the centrifugal effect, the L-shaped 2D-channel is used for the crossflow, and water is used as a fuel simulant. The jet breakup is captured using a high-speed camera, and the density gradient magnitude is post-processed to clarify the spray. The Sauter mean diameter (SMD) of the spray is measured via a laser diffraction method with a helium–neon laser optical system (HELOS). The characteristics of the jet in the L-shape crossflow are compared with the characteristics of the jet in a typical crossflow through the flat channel. The results for different outlet heights of the L-shape channel ( H / d 0 ) and different injector positions ( L / d 0 ) are presented. A dimensionless number ( τ ) consisting of a time ratio is introduced to describe the jet characteristics. In a previous work, the spraying tendency was demonstrated for different injector positions. In addition, the effect of the recirculation area on H / d 0 was empirically shown. H / d 0 determines the size of the recirculation area, and the range of τ determines the jet breakup mechanism inside the L-shape channel. The results of this study present the breakup mechanism of the jet in the L-shape channel flow, which simulates a jet in a radial swirler injector for gas turbine engines. It is expected that these results can be used to assist in designing gas turbine engines with more combustion efficiency.

Keywords: jet in crossflow; atomization; breakup; radial swirler; Sauter mean diameter; spray (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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