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叶顶间隙及掠改型对混流喷泵的影响

DOI: 10.16411/j.cnki.issn1006-7736.2015.03.014, PP. 77-81

Keywords: 喷水推进混流泵,叶顶间隙,倾掠改型

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Abstract:

以混流式喷水推进泵作为研究对象,采用三维雷诺平均N-S方程和S-A湍流模型进行CFD模拟,研究不同叶顶间隙下喷泵的性能和流场损失状况,进而做动叶掠改型以期改善对叶顶间隙流动.结果显示:叶顶间隙的存在有助于沟通压力面与吸力面压差,减少动叶出口回流.对于所研究的喷水推进混流泵,在0~0.6mm小叶顶间隙时,效率随间隙增大而升高,而间隙过大会使泄漏损失增加,最优间隙为0.6mm.对动叶进行的掠改型发现,前掠会使压力面前缘的损失略有提高,但叶片整体损失下降;从吸力面来看,前掠有助于减小叶顶泄漏损失,+5°掠全工况的效率均有提高,并获得较为平稳的功率曲线.

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