| Citation: | DONG Yiheng, ZHANG Bin, LYU Keyu, et al. Study on characterization of initial flow of an elliptical jet in crossflow[J]. Journal of Aerospace Power, 2025, 41（X）：20250358 doi: 10.13224/j.cnki.jasp.20250358
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Based on the multicomponent compressible Navier-Stokes equations, the initial flow characteristics of a subsonic elliptical jet under different crossflow velocities were numerically investigated using the large-eddy simulation (LES) method and a high-precision tuned centered-difference (TCD) scheme. This study aimed to elucidate the initial flow characteristics during the interaction between the noncircular jet and the crossflow under flow control conditions. The initial development stage of the primary vortex ring, from its formation and evolution after jet ejection until the first occurrence of axis switching was analyzed. The numerical results clearly described the effects of crossflow velocity on the evolution of the jet vortex structures, penetration depth, and mixing efficiency, and revealed the evolution mechanism of the three-dimensional flow pattern of the primary vortex loop in the noncircular jet under crossflow. It was found that the tangential velocity of the crossflow moving around the jet surface effectively counteracted the self-induced tangential velocity arising from the deformation of the noncircular jet. This counteraction suppressed the generation of rib vortices in the windward shear layer and enhanced the stability of the Leading-edge vortex loops there. When the crossflow moved around the shear layer at both ends of the major axis, the tangential velocity difference between the inner and outer flow paths induced the formation of a strong pair of counter-rotating streamwise vortices (CVP) at these locations. This CVP became dominant in the later stages of jet development, eventually causing the jet cross-section to transform into the typical counter-rotating vortex pair structure.In addition, the coupling between the CVP on the jet shear layer and the vortex ring segment on the leeward side promoted the breakup and destabilization of the primary vortex loops. This process reduced the jet penetration depth while improving the mixing efficiency.
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