Experimental Study on a Centrifugal Pump with an Open Impeller during Startup Period  

作　　者：Yuliang Zhang Zuchao Zhu Yingzi Jin Baoling Cui Yi Li Huashu Dou 

机构地区：[1]The State Key Lab of Fluid Power Transmission and Control,Zhejiang University [2]The Province Key Lab of Fluid Transmission Technology,Zhejiang Sci-Tech University

出　　处：《Journal of Thermal Science》2013年第1期1-6,共6页热科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.21076198,51249003);the National Basic Research Program ("973" Program,No.2009CB724303)

摘　　要：Transient performance of fluid machinery during transient operating periods, such as startup and stopping, has been drawn more attentions recently due to the growing engineering needs. In this paper, the transient behavior of a prototype centrifugal pump with an open impeller during rapid startup period is studied experimentally. The variations of the rotational speed, flow rate, head, and shaft power during rapid startup period are recorded in ex- periments at different discharge valve openings. In addition, the non-dimensional flow rate and head are also used to analyze the transient behavior. The research result shows that the rise characteristic of the rotational speed is not basically changed by working points, while mainly depends on the startnp characteristics of the driving motor. Compared with the rapid rise of the rotational speed, the flow rate rises slowly in the initial stage of startup. Moreover, the flow rate lags behind the rotational speed to rise to final stable value, and the delay becomes more severe with the increase of the discharge valve opening. The shaft power impact phenomenon generally exists in the process of startup. The non-dimensional analysis shows that the non-dimensional head is very high at the very beginning of startup, and quickly falls to the minimum, then gradually rises to final stable value, while the non-dimensional flow rate always shows the rise tendency during whole startup period. In conclusion, it is found from the non-dimensional results that the quasi-steady analysis is unable to accurately assess the transient flow during startup period.

关 键 词：centrifugal pump open impeller STARTUP experimental study transient behavior 

分 类 号：TH311[机械工程—机械制造及自动化]