Experimental and numerical research on the noise suppression and wake control of impinging jets by virtue of groove structure

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (22) : 105-112.

QI Longzhou1，FENG Heying1，ZHAO Kun2，ZHANG Junlong2，WANG Haitao1，YANG Chenghao1

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Abstract

The method of combining numerical simulation and experimental research is used to explore the control effect and control mechanism of the slotted inclined plate on jet impact noise and wall-jet. In terms of experiments, PIV technology and far-field microphone arc arrays are used to measure the flow field and sound field characteristics of impinging jets in a semi-anechoic chamber. The numerical simulation uses a hybrid method combining the separation eddy simulation method (DES) and the FW-H acoustic analogy method. The numerical results are in good agreement with the experimental measurement results of the flow field/sound field. The study found that the existence of the plate increases the acoustic radiation in the upstream direction of the impinging jet flow field; at all pressure ratios, the groove structure on the plate surface can obviously inhibit the cross-flow, but only when the NPR> 2.5, the slotted inclined plate in order to better suppress the impact jet noise; the slotted inclined plate mainly reduces the pure tone amplitude around 2500Hz, and basically has no effect on the multiple pure tones in the range of 3500 Hz~4500 Hz, because the groove structure will dissipate the impact jet the vortex pair in the stagnation zone does not affect the jet shear layer vortex shedding frequency (3750 Hz) and the pure tone near this frequency; the slotted inclined plate has a 46% suppression effect on the cross-flow, and different groove widths and groove depths can effectively control the cross-flow wake of the impinging jet.

Key words: wake control; impingement jet noise control; detached-eddy simulation(DES);PIV flow field; groove structure

Key words

wake control

/ impingement jet noise control / detached-eddy simulation(DES);PIV flow field / groove structure

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QI Longzhou1，FENG Heying1，ZHAO Kun2，ZHANG Junlong2，WANG Haitao1，YANG Chenghao1. Experimental and numerical research on the noise suppression and wake control of impinging jets by virtue of groove structure[J]. Journal of Vibration and Shock, 2022, 41(22): 105-112

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