基于CFD的离心泵侧壁式压水室优化设计  

Optimal design of centrifugal pump with tilt volute based on CFD

作　　者：杨敏官[1] 张宁[1] 李忠[1] 高波[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2013年第1期28-32,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50776040;51206063);江苏省高校自然科学研究项目(11KJB470003)

摘　　要：为了获得侧壁式压水室离心泵较高的水力效率和低的压力脉动水平,通过控制侧壁式压水室的侧壁倾斜角及叶轮外径和压水室基圆直径之间的间隙,在相同的叶轮及进出口边界条件下,采用Fluent软件对比转数为130的侧壁式压水室离心泵进行数值计算.结果表明:间隙率不变,侧壁倾斜角为15°,离心泵的水力效率达到最大值;侧壁倾斜角不变时,随着间隙率的增大泵的水力效率提高,并在间隙率为0.308时达到最大值;将时域信号进行FFT变换为频域信号,在倾斜角为15°时,叶频的脉动幅值最低;当倾斜角不变时,随着间隙率增加叶频的脉动幅值水平呈下降趋势;考虑泵的径向尺寸,侧壁式压水室间隙率不能取太大,提出的间隙率取值范围为0.134～0.192.To achieve high efficiency and low pressure pulsation, the slant angle of tilt volute and clea- rance between impeller and volute were controlled. A centrifugal pump with tilt volute of specific speed 130 was simulated by Fluent software at the same boundary conditions. The results show that when clea- rance rate keeps constant, the hydraulic efficiency reaches maximum at slant angle of 15°. The hydraulic efficiency is increased with the increasing of clea-rance rate with maximal value at clearance of 0. 308. FFT（ Fast Fourier Transform Algorithm） was adopted to transform time-domain pressure signals into frequency-domain pressure signals. The magnitude of pressure pulsation at fBP obtains minimum value at slant angle of 15 °. The amplitude of pressure pulsation at fBp is decreased with the increasing of clearance rate. The clearance rate is suggested in the range from 0. 134 to 0. 192 because the clearance rate is limited by radial dimension.

关 键 词：离心泵 侧壁式压水室 水力效率 压力脉动 优化设计 

分 类 号：TH311[机械工程—机械制造及自动化]