| Citation: | LI Hao, JIANG Shujie, ZHANG Rongping, et al. Numerical simulation of subsonic impinging jet flow field characteristics and tone mechanism[J]. Journal of Aerospace Power, 2026, 41(1):20240851 doi: 10.13224/j.cnki.jasp.20240851 |
The noise generated by impinging jets is a critical issue during the takeoff and landing of fighter jets and carrier-based aircraft. However, the mechanism behind the generation of tone in subsonic impinging jets remains poorly understood. An impinging jet with a nozzle pressure ratio of 1.69 and an impingement distance of three nozzle diameters was studied. Large eddy simulation was employed to capture the near-field flow, and an acoustic analogy model was used to predict the far-field noise. The extended Helmholtz decomposition and principal correlation decomposition methods were applied to analyze the modal characteristics and the correlation between the near-field flow and far-field noise. The results revealed that, due to the influence of the impingement plate, a supersonic region appeared in the flow field, forming shock cells. The noise mode of the impinging jet exhibited an axisymmetric structure. The tone in the far field was closely related to the shock waves in the near field. The associated modal structure manifested as waves that gradually propagated outward from the impingement region, and the transmission process connected the vortex structures on the flat plate with the shock structures in the free jet region. The pressure field in the near field dominated noise generation compared with the velocity field. The alternating positive and negative amplitudes of the modal amplitudes in the impingement region constituted a key factor in the generation of tone. This study could elucidate the mechanisms of impinging jet noise and provide a theoretical foundation for the optimization and control of impinging jet noise.
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