凹槽结构对冲击射流流场和声场特性的影响研究

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摘要

采用数值模拟和试验研究相结合的方法探究了开槽斜板对射流冲击噪声及壁面横向射流尾迹的影响，并分析了其降噪机理。试验方面，采用 PIV 技术和远场传声器弧阵列在半消声室内测量了冲击射流流场和声场特性，数值模拟则采用分离涡模拟方法 (detached-eddy simulation ，DES) 和 FW-H 声学比拟法相结合的混合方法，数值结果与流场/声场试验测量结果吻合较好。研究发现：冲击斜板的存在增加了冲击射流流场上游方向的声辐射；所有压比下，斜板表面凹槽结构都能够明显抑制横向流动，但只在 NPR > 2.5 时，开槽斜板才能较好的抑制冲击射流噪声；开槽斜板主要是降低 2 500 Hz 附近的纯音幅值，对 3500 ~ 4 500 Hz内的多个纯音基本不产生影响，因为凹槽结构会耗散掉冲击射流滞止区内的旋涡对，但不会影响射流剪切层涡脱落频率 (3 750 Hz) 及该频率附近的纯音；开槽斜板对横向流动的抑制效果高达 46%，且不同槽宽、槽深的开槽斜板均能够有效控制冲击射流横向流动尾迹。

关键词：尾迹流动控制；冲击射流噪声抑制；分离涡模拟；PIV 流场；凹槽结构

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	齐龙舟1
	冯和英1
	赵鲲2
	张俊龙2
	王海涛1
	杨成浩1

关键词 ：尾迹流动控制')" href="#">

尾迹流动控制, 冲击射流噪声抑制, 分离涡模拟, PIV 流场, 凹槽结构

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')" href="#">

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

收稿日期: 2021-09-08 出版日期: 2022-11-28

引用本文:

齐龙舟1，冯和英1，赵鲲2，张俊龙2，王海涛1，杨成浩1. 凹槽结构对冲击射流流场和声场特性的影响研究[J]. 振动与冲击, 2022, 41(22): 105-112.
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. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(22): 105-112.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I22/105

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