水翼多模态的空化结构演化与空腔溃灭压力的耦合特性

doi:10.12066/j.issn.1007-2861.2297

摘要/Abstract

摘要：

采用可压缩的数值方法计算了不同空化数下绕流水翼的空化流场, 分析了非定常空化流动中空化结构的脱落模式、溃灭过程, 以及压力波的释放、传播及其与残腔的耦合特征. 结果表明: 可压缩数值模型能够捕捉局部腔体溃灭时压力波的释放、传播和回弹现象; 不同空化数下存在不同的腔体脱落、溃灭模式; 在特定的空化数下, 可能会在一个大的空化结构脱落循环周期内包含多个动力学演化过程, 空化结构的溃灭也会诱导多个压力脉动峰值, 并对剩余残腔总体产生抑制作用; 由凝聚激波诱导的残余腔体溃灭具有持续时间长、压力脉动幅值小的特点; 而大尺度云空化脱落腔体溃灭时释放的压力波持续时间短、脉动幅值大, 这些都可能造成机械结构振动和空蚀破坏.

关键词: 空化, 腔体结构溃灭, 压力波, 结构演化, 可压缩

Abstract:

Based on a compressible numerical simulation, cavitation flow under different cavitation numbers was calculated. The mechanism of cavity shedding and the processes of collapse and release, propagation, and coupling characteristics of the pressure wave were investigated. The results revealed the following. The numerical model could capture the release, propagation, and rebound of pressure waves during local cavity collapse. There were different cavity shedding and collapse modes under different cavitation numbers. There may be multiple dynamic evolutionary processes in a shedding cycle of a large cavitation structure at a certain cavitation number. The cavity collapse induced by the condensed shock wave had a long duration and exhibited a small pressure-fluctuation amplitude and high release frequency, while the exfoliating large-scale cavity collapse exhibited a rapid, large pressure amplitude and a short action time, which may cause structural vibration and cavitation erosion damage.

Key words: cavitation, cavity structure collapse, pressure wave, evolution of cavity structure, compressible simulation

中图分类号:

O352

朱兵, 杨朴. 水翼多模态的空化结构演化与空腔溃灭压力的耦合特性[J]. 上海大学学报(自然科学版), 2021, 27(4): 611-634.

ZHU Bing, YANG Pu. Coupling characteristics between a hydrofoil's cavitation structural evolution and collapse pressure under multiple modes[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(4): 611-634.

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