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双吸离心泵隔舌区压力脉动特性分析

, PP. 60-63

Keywords: 双吸泵,压力脉动,隔舌,大涡模拟

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Abstract:

双吸离心泵内部的湍流压力脉动是引起机组振动及噪声的主要原因,这一现象在隔舌区尤为严重。采用大涡模拟方法(LES)和滑移网格技术,对双吸离心泵进行了不同工况下三维非定常湍流数值模拟,得到了水泵内部流场特性及隔舌区计算点的压力脉动情况,并对其进行了频域分析。结果表明,在设计工况和大流量工况下,叶片通过频率在脉动频域中占主导地位,而在小流量工况下,低于1倍叶片通过频率的脉动占主导地位;压力脉动幅值随着流量偏离设计工况的程度而变化,在流量为0.62、0.80和1.20倍设计流量工况下,压力脉动幅值相对于设计工况分别增大

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