| Citation: | CHEN Bao, LI Weipeng, WU Fei, et al. Experimental study on noise suppression technology of subsonic inclined impinging jet[J]. Journal of Aerospace Power, 2025, 40（6）：20230035 doi: 10.13224/j.cnki.jasp.20230035
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During taking off of carrier-based aircraft, the engine exhaust impinged on the jet blast deflector generates high-intensity noise, which endangers the hearing health of deck staff and the safety of equipment structure. Under the circumstance of subsonic cold jet impinging on a inclined plate, by taking advantage of chevron nozzles and micro structured inclined plates, the suppression effects of two noise suppression strategies on impinging jet noise were studied. The effects of the chevron nozzles on impinging jet noise characteristics, such as chevron number, chevron penetration and chevron length, were analyzed carefully. The effects on the directivity and intensity of impinging jet noise of the micro structured impinged plates, such as triangular streamwise grooves, pyramid bulges, embedded circular holes, and triangular crossing grooves, were explored. Investigation was carried out to assess the noise-suppressing superposition effects of multiple suppression strategies, which consisted of chevron nozzles and micro structured inclined plates. The experimental results showed that chevron nozzles efficiently suppressed impinging jet noise, and increasing chevron penetration can further improve the ability of noise reduction. Micro structured impinged plates can reduce noise in the low frequencies, and the triangular crossing groove plate had the best suppression effect, achieving a maximum reduction in the overall sound pressure levels of up to 3.68 dB at the downstream. The combined strategies of noise reduction significantly suppressed downstream noise levels, manifesting a distinct nonlinear superposition mechanism. The study conclusions had engineering guiding significance for suppressing impinging jet noise of carrier-based aircraft.
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