Study of Unforced Unsteadiness in Centrifugal Pump at Partial Flow Rates  

作　　者：YANG Jun XIE Tian LIU Xiaohua SI Qiaorui LIU Jun 

机构地区：[1]School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China [2]Key Laboratory of Fluid and Power Machinery(Xihua University),Ministry of Education,Chengdu 610039,China [3]Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,Shanghai 200093,China [4]School of Aeronautics and Astronautics,Shanghai Jiao Tong University,Shanghai 200240,China [5]Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,China

出　　处：《Journal of Thermal Science》2021年第1期88-99,共12页热科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.51976125);Open Research Subject of Key Laboratory of Fluid and Power Machinery(Xihua University),Ministry of Education(Grant number zj2015-024);Natural Science Fund of Shanghai(Grant No.19ZR1425900)。

摘　　要：In order to explore the unforced unsteadiness of centrifugal pumps,a 2-D frequency domain imaging display technology was used to study the development of these unsteady flow structures at partial flow conditions.The results showed that,the unsteady flow field was not only affected by rotor and stator interaction,but also appeared an unforced unsteadiness with fundamental frequency of St≈0.23 around the impeller throat area.Moreover,as the flow rates decreased,this unsteady flow structure gradually weakened and disappeared.When the flow rate was reduced to 0.6 times of design flow rate,another two unforced unsteady flow structures with characteristic frequencies of St≈0.0714 and St≈0.12 began to appear in the same area.Therefore,with the operating condition smaller than design flow rate,the internal flow became more and more complex.In addition to the forced unsteadiness,the unforced unsteadiness which is not connected with the blade passage frequency became more and more obvious.

关 键 词：centrifugal pumps partial flow conditions pressure pulsations unforced unsteadiness 2-D frequency domain visualization method 

分 类 号：TH311[机械工程—机械制造及自动化] TK05[动力工程及工程热物理]