非定常空化涡旋结构演化及压力波机制的研究

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摘要压力波机制是空化流动机制的一种，压力波的产生和传播是空化不稳定的重要来源。本文基于可压缩流体求解器和分离涡模拟（DES）研究了三维水翼空化流动。结果表明：压力波是由先前脱落的云空泡溃灭产生的，其传播过程会导致片状空泡的收缩和水翼表面高压力脉冲。压力波的产生会强烈扰乱涡旋的运动，水翼表面上的稳定涡旋结构被卷起，并且被小尺度涡旋结构所替代。采用动力学模态分解方法分析流场特征，压力波效应和附着片状空泡的演变占据了流场的主要能量。

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	王子豪1
	孙铁志1
	张桂勇1
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关键词 ：非定常空化, 可压缩, 涡旋结构, 压力波, 动力学模态分解

Abstract：The pressure wave mechanism is one of the cavitation flow mechanisms. The generation and propagation of pressure wave is an important source of cavitation instability. In this paper, three-dimensional hydrofoil cavitation flow is studied based on compressible fluid solver and detached-eddy simulation (DES). The results show that the pressure wave is generated by the pressure wave generated by the collapse of the cloud cavity. The propagation process of the pressure wave causes the shorten of the sheet cavity and the high-pressure pulse on the surface of the hydrofoil. The pressure wave is strongly disturb the motion of the vortex. The stable vortex structure on the surface of the hydrofoil is rolled up and replaced by the small-scale vortex structure. The dynamic mode decomposition method is used to analyze the characteristics of the flow field. The first-order mode represents the basic framework and main characteristics of the flow field. The pressure wave effect and the evolution of attached sheet cavity occupy the main energy of the flow field.

Key words： unsteady cavitation compressibility vortex structure pressure wave dynamic mode decomposition

收稿日期: 2023-02-06 出版日期: 2024-01-28

引用本文:

王子豪1，孙铁志1，张桂勇1,2. 非定常空化涡旋结构演化及压力波机制的研究[J]. 振动与冲击, 2024, 43(2): 22-31.
WANG Zihao1，SUN Tiezhi1，ZHANG Guiyong1,2. Investigation on transient unsteady cavitation vortex structures and the pressure wave dynamics. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(2): 22-31.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2024/V43/I2/22

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