| 摘要: |
| 【目的】 寻找前置导叶的最佳时序位置，提高离心泵的综合性能。【方法】 以某低比转速单级离心泵为研究对象，采用RNG k ε湍流模型，对设计工况下前置导叶相对径向导叶在4种不同时序（前置导叶相对周向旋转0°、15°、30°、45°）位置下离心泵内部流动进行了三维黏性非定常数值模拟。【结果】 随着前置导叶时序位置的增大，时均扬程和时均效率均呈周期性波动，当时均扬程处于波峰时，时均效率处于波谷，当时均效率处于波峰时，时均扬程处于波谷，最大时均扬程比最小时均扬程高1%，最大时均效率比最小时均效率高1.43%；随着前置导叶时序位置的改变，离心泵的必需汽蚀余量先增大后减小，最大必需汽蚀余量比最小必需汽蚀余量高6%，前置导叶相对周向旋转45°时，必需汽蚀余量最小，空化性能最好；叶轮和径向导叶压力脉动的主频和幅值直接受时序效应的影响。【结论】 前置导叶的时序位置对离心泵的外特性、空化特性、振动特性等都有影响，综合比较分析4种时序位置下离心泵的性能差异，以前置导叶相对周向旋转45°时离心泵的水力性能最好。 |
| 关键词: 前置导叶 离心泵 叶轮 径向导叶 时序位置 |
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| 基金项目:国家自然科学基金项目(51279160)；陕西省教育厅专项科研计划项目(11JK0731)；教育部博士点基金项目(20126118130002)；陕西省百人计划项目（2012） |
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| Effect of clocking position of front guide vane on pulsation characteristic of pressure in centrifugal pump |
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DENG Jia,LU Jin-ling,XU Yi-rong,et al
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| Abstract: |
| 【Objective】 This paper aimed to obtain the optimal clocking position of front guide vane to improve the overall performance of centrifugal pump.【Method】 A low specific speed single stage centrifugal pump was selected and three dimensional viscous unsteady numerical simulation was conducted using RNG k epsilon turbulence model to investigate the internal flow of centrifugal pump when front guide vane was at different clocking positions relating to diffuser (the relative circumferential rotations were 0°,15°,30°,and 45°,respectively).【Result】 With the increase of clocking position of front guide vane,the time average head and efficiency waved cyclically.When the time average head was at peak,the time average efficiency was at trough.The maximum time average head was 1% higher than its minimum while the maximum time average efficiency was 1.43% higher than its minimum.With the change of clocking position,necessary net positive suction head (NPSHr) increased first before decreasing.The maximum NPSHr was 6% higher than the minimum.When the angle between reference blade of front guide vane and reference blade of diffuser was 45°,NPSHr decreased and pump obtained the best cavitation performance.Pulsation frequency and amplitudes of impeller and diffuser were also directly affected by clocking position.【Conclusion】 The external characteristic,cavitation and vibration characteristics were affected by clocking position of front guide vane.After comparative analysis,an angle of 45° between reference blade of front guide vane and reference blade of diffuser was the optimal. |
| Key words: front guide vane centrifugal pump impeller diffuser clocking position |
