前缘扰流体对水中流激空腔振荡影响的数值研究

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Abstract In order to suppress flow-induced cavity oscillations in water, a new kind of passive control method based on flow-separation mechanism is proposed, that is mounting an inverted wedge block at a certain height above the cavity leading-edge. This wedge block, which is called Leading-flow Division (LFD) in this paper, can improve the flow field in the cavity and suppress the cavity oscillation by dividing a part of incoming boundary layer fluid into cavity. The large eddy simulation method is used to the numerical investigation of the control effect of LFD on the underwater cavity oscillation from three aspects: pulsation pressure, velocity characteristics and vorticity characteristics of flow field. The control effect of LFD on cavity oscillation is also compared with Rod Spoiler (RS) and Saw-Tooth Spoiler (STS), which were proved having good effects on suppressing cavity oscillation. The results show that LFD have best effect on suppressing cavity oscillation with reducing the line spectrum amplitude of the bottom pulsation pressure to 17.4dB. Besides, the calculation results also show that LFD have the minimum additional resistance which is more suitable for piratical engineering applications. This study lays a good theoretical foundation for reducing the flow-induced cavity noise at the underwater apertures of ships.

Key words： cavity oscillation spoilers passive control line spectrum noise numerical simulation

Received: 17 June 2020 Published: 28 December 2021

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	ZHANG Wenwen1
	2
	XU Rongwu1
	2

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ZHANG Wenwen1,2,XU Rongwu1, et al. Numerical investigation on the influence of leading-edge spoilers on underwater flow-induced cavity oscillations[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(24): 12-21.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I24/12

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