不同前导叶时序位置下离心泵内压力脉动特性研究

发布时间：2018-05-13 23:40

本文选题：前置导叶 + 离心泵　；参考：《西北农林科技大学学报(自然科学版)》2016年01期

【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RNGk-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。
[Abstract]:[objective] to find the best time sequence position of the front guide vane and improve the comprehensive performance of the centrifugal pump. [methods] taking a single stage centrifugal pump with low specific speed as the research object, RNGk- 蔚 turbulence model was used. Three dimensional viscous unsteady numerical simulation of the flow in centrifugal pump with four different time series (relative circumferential rotation 0 掳/ 15 掳/ 30 掳/ 45 掳) of the guide vane relative diameter under the design condition is carried out. [results] with the front guide vane, the flow in the centrifugal pump is simulated. The increase of time sequence position, Both the hourly average head and the hourly average efficiency fluctuate periodically. When the average head is at the peak, the hourly average efficiency is in the trough, and the average efficiency is in the trough when the average efficiency is at the peak, and the average head is in the trough when the average efficiency is at the peak. The maximum average head is 1% higher than the minimum average head, the maximum hourly average efficiency is 1.43 higher than the minimum average time average efficiency, and the necessary cavitation allowance of the centrifugal pump increases first and then decreases with the change of the timing position of the leading guide vane. The maximum required cavitation margin is 6 higher than the minimum necessary cavitation margin. When the front guide blade rotates 45 掳relative to the circumference, the required cavitation margin is the smallest and the cavitation performance is the best. The main frequency and amplitude of pressure pulsation of impeller and diameter guide blade are directly affected by the timing effect. [conclusion] the timing position of the leading guide vane has influence on the external characteristics, cavitation characteristics and vibration characteristics of centrifugal pump, etc. The hydraulic performance of the centrifugal pump is the best when the front guide vane rotates 45 掳relative to the circumference.
【作者单位】：西安理工大学水利水电学院;西安热工研究院有限公司;乌海电业局;
【基金】：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)
【分类号】：TH311

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