蜗壳面积变化规律对低比转数离心泵性能的影响

发布时间：2018-10-11 19:40

【摘要】：为研究不同蜗壳面积变化规律对离心泵性能的影响,以一台单级单吸离心泵为研究对象,在保证叶轮及其他几何参数不变的前提下,针对4种蜗壳断面面积变化规律(即上凸式、线性式、下凹式和S形),进行泵内非定常数值计算及分析.结果表明:蜗壳面积变化规律在设计工况下对离心泵水力性能的影响较小,上凸式、下凹式和S形蜗壳面积变化规律的泵扬程和效率与线性式之差分别在1.4%和0.4%以内,而在非设计工况下,差异较大;不同蜗壳断面内的速度分布差异较大,线性式、下凹式和S形的速度分布较上凸式更为均匀;在设计工况下,上凸式和S形面积变化规律的蜗壳能有效降低泵内的压力脉动水平,其中S形面积变化规律的蜗壳效果最佳,而下凹式则会使泵内的压力脉动幅值增大;蜗壳面积规律变化引起叶轮周围静压分布变化,致使叶轮所受径向力的大小改变,线性式面积规律的泵叶轮平均径向力最小,上凸式面积规律的泵叶轮所受平均径向力最大.研究成果可为低脉动水平离心泵的优化设计提供一定参考.
[Abstract]:In order to study the influence of different volute area on the performance of centrifugal pump, a single-stage single-suction centrifugal pump is taken as the research object, and the impeller and other geometric parameters remain unchanged. The unsteady numerical calculation and analysis of the surface area of four kinds of volute (i.e. upper convex, linear, concave and S-shaped) are carried out. The results show that the variation of volute area has little effect on the hydraulic performance of centrifugal pump under the design condition. The difference between the lift and efficiency of the pump and the linear formula is within 1.4% and 0.4% respectively. In the off-design condition, the velocity distribution in different volute sections is quite different, linear, concave and S-shaped velocity distribution is more uniform than that in the upper convex type; under the design condition, the velocity distribution is more uniform than that in the upper convex type. The volute with the changing law of upper convex and S-shaped area can effectively reduce the pressure pulsation level in the pump, and the spiral case with S-shaped area variation law has the best effect, while the concave type can increase the amplitude of pressure pulsation in the pump. The change of volute area law causes the change of the static pressure distribution around the impeller, which results in the change of the radial force of the impeller. The average radial force of the pump impeller with linear area law is the smallest, and that of the pump impeller with convex area law is the largest. The research results can provide some reference for the optimization design of low-pulse horizontal centrifugal pump.
【作者单位】：江苏大学能源与动力工程学院;江苏振华泵业股份有限公司;
【基金】：国家自然科学基金资助项目(51576090) 江苏高校优势学科建设工程项目
【分类号】：TH311

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