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工程力学  2014 

轴流泵叶顶泄漏涡空化的数值模拟与可视化实验研究

, PP. 225-231

Keywords: 轴流泵,数值模拟,叶顶泄漏涡,空化,高速摄影

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Abstract:

该文以某一等比例缩放模型泵为研究对象,采用修正的SSTk-ω湍流模型和空化模型,对额定工况下轴流泵叶顶泄漏涡空化流进行了数值模拟,并与高速摄影结果进行了对比分析。探讨了叶顶区域泄漏涡空化流场结构,揭示了不同空化数下空化发生位置和空泡形态演变过程。研究结果表明,改进的数值模拟方法准确计算了叶顶区域空化流场的流动结构;轴流泵的初生空化为叶顶间隙空化和叶顶泄漏涡空化,随着空化数σ降低,叶顶泄漏涡卷吸区也出现了剪切层空化;在空化数较小工况下,沿着叶片吸力面在轴向形成空泡云,并在叶片尾缘存在周期性的空泡脱落和爆破过程,破坏了流动稳定性,并诱导产生空化噪声。

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