High efficiency design of low specific speed centrifugal pump based on orthogonal tests
LYU Zhongbin1, LIU Jieqiong1, CAO Puyu2*, YOU Baojian1
1. Shanghai Kaiquan Pump(Group)Co., Ltd., Shanghai 201800, China; 2. National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：In order to study the influence of impeller structural parameters on improving the working efficiency of low specific speed centrifugal pump with ns between 40 and 60 under the working condition range of 0.75Qd-1.20Qd, a single-stage single-suction vertical centrifugal pump was taken as the research object. The orthogonal test scheme L9(43)was established by selecting impeller outlet width b2, blade number Z, blade outlet placement angle β2 and blade envelope angle φ as test factors. Numerical calculations of each scheme model were carried out in the working condition range of 0.75Qd-1.20Qd, the influence sequence of each factor on hydraulic performance was analyzed and summarized, after which the optimal parameter combination of the pump impeller structure was obtained. Finally, the impeller was modified according to the optimal size, and the test results of the hydraulic characteristics of the optimized pump were compared with that of the original pump. The results show that under the high-efficiency design condition, the structural parameters of the low specific speed centrifugal pump impeller that affects the efficiency is in the descending order of b2,β2,φ and Z. The main factor affec-ting hydraulic performance is b2. The optimal horizontal combination of impeller structural parameters in high-efficiency design is determined. After optimization, the overall pump efficiency is improved by nearly 2.85% compared with the original pump, and the high-efficiency zone is widened to the opera-ting range of 0.75Qd-1.20Qd. The correction coefficients k′b2,k′Z and k′φ are obtained in order to guide the efficient design of low specific speed centrifugal pumps.
吕忠斌,刘洁琼,曹璞钰*,尤保健. 基于正交试验的低比转数离心泵高效设计[J]. 排灌机械工程学报, 2023, 41(12): 1189-1195.
LYU Zhongbin,LIU Jieqiong,CAO Puyu*,YOU Baojian. High efficiency design of low specific speed centrifugal pump based on orthogonal tests. Journal of Drainage and Irrigation Machinery Engin, 2023, 41(12): 1189-1195.
