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超低马赫数空腔流诱发自激振荡数值模拟

, PP. 121-126

Keywords: 汽车工程,空腔流,弱可压缩流模型,大涡模拟

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Abstract:

?为了揭示超低马赫数空腔流诱发自激振荡的机理,通过引入弱可压缩流体模型并采用大涡模拟对空腔内的瞬态流场和压力脉动进行了计算。将计算获得的腔内压力脉动与低噪声风洞测试结果进行了对比,以验证计算方法的可靠性。结果表明:弱可压缩流模型的大涡模拟能较为准确地预测超低马赫数空腔流自激振荡的频率与幅值;频率分布显示振荡具有准谐振的特点;空腔内的流场结构和开口处涡的运动表明自激振荡的产生机理为空腔前缘的涡旋脱落后击打在空腔的后缘,产生压力回弹,回弹的压力波传到上游进一步加剧了涡旋的脱落。

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