离心泵快速启动过程瞬态水力特性的数值模拟  

Numerical simulation of centrifugal pump's transient performance during rapid starting period

作　　者：吴大转[1] 王乐勤[1] 胡征宇[1] 

机构地区：[1]浙江大学化工机械研究所,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2005年第9期1427-1430,1454,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(50376056).

摘　　要：为了准确预测离心泵快速启动过程的瞬态水力特性,应用功率键合图法建立了离心泵系统动力学模型.该模型基于能量守恒和一维系统动力学方法,给出了离心泵系统键合图结构,推导了描述离心泵启动过程内部能量供给、传递、转化和消耗的基本关系式.结合键合图结构和能量守恒关系得到了系统状态方程组,并采用四阶Runge-kutta法进行数值求解.数值模拟结果表明,在快速启动过程中,预测的离心泵动态流量、扬程和转速的变化趋势都能与实验结果较好吻合,并且模型能预测到离心泵快速启动过程的瞬态效应,功率键合图法可以适于对离心泵快速启动过程的动态特性进行模拟.For predicting accurately the transient hydrodynamic characteristics of centrifugal pump during rapid starting period, the pump system dynamics model was established by using the method of bond graph. Based on energy conservation and one-dimensional analysis of the system dynamics, the bond graph configuration of the pump system was presented, and the basic equations describing energy input, transfer, translation and dissipation of the pump system were deduced. The system state-equation group was obtained by the bond graph associating with the energy conservation, then was resolved by 4-order RungeKutta method. The results show that the trends of dynamic flow rate, pump head and rotational speed gained from bond graph simulation agree well with the experimental results, and that the transient effect of pump can be predicted by the model during the transient course. Bond graph simulation is well suited for predicting the dynamic characteristics of centrifugal pump during starting periods.

关 键 词：离心泵 快速启动 瞬态状况 数值模拟 键合图 

分 类 号：TH311[机械工程—机械制造及自动化]