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力学学报  2014 

非定常空化流动涡旋运动及其流体动力特性

DOI: 10.6052/0459-1879-13-177, PP. 191-200

Keywords: 空化,涡旋结构,动力特性,大涡模拟

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Abstract:

采用大涡模拟方法对绕水翼云状空化的水动力特性和非定常流场结构进行研究.基于实验结果对数值方法进行验证,分析空化与流场内部涡旋结构之间的相互作用以及对水翼动力特性的影响.研究结果表明大涡模拟方法可以准确模拟绕水翼流动的非定常过程.在无空化条件下,升阻力系数存在斯特劳哈数St=0.85的主频波动,这是由水翼尾部涡旋结构的发展脱落引起的;在云状空化条件下,升阻力系数存在St=0.34的高能量密度低频波动,这是由大规模云状空泡团的发展和脱落引起的;云状空化阶段的升阻力系数在St=0.5~1.5的范围内都存在较高的波动,这是由于空化现象对水翼尾缘涡旋结构的发展和脱落产生影响,在不同发展阶段,空化现象不同程度地降低尾缘涡旋结构脱落频率.

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