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基于流固耦合的核主泵汽蚀动力特性研究

DOI: 10.3969/j.issn.1006-7043.201302014

Keywords: 核主泵, 流固耦合, 汽蚀, 数值模拟, 动力特性

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Abstract:

为研究在考虑流固耦合的基础上, 核主泵在发生汽蚀时, 汽蚀对叶片的变形及径向力的变化规律,应用数值模拟方法对核主泵在不同汽蚀工况下汽蚀对叶轮最大变形量和径向力进行数值模拟。结果表明:汽蚀发生区域中气体体积分数最大的地方对应于叶片进口的最大变形量处。在汽蚀初生工况时,叶轮最大变形主要受压力脉动的影响,在汽蚀发展工况时,汽蚀仅对叶轮最大变形的幅值产生影响,其波动幅值仍然由压力脉动占主导,汽蚀仅对径向力的位置及波动幅值产生影响。在汽蚀严重工况时,汽蚀是叶轮最大变形波动幅值的主要因素。在此汽蚀工况下, 汽蚀不仅对径向力的位置及波动幅值产生影响,而且也对径向力的值也产生明显影响, 故在后续设计中需要重点考虑汽蚀对径向力的影响。

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