摘要
为研究离心泵启动过程的瞬态外特性和内部流动特性,进行瞬态特性的试验、外特性和内部流动的数值模拟,给出了瞬态特性的试验方法和内流数值模拟方法。外特性试验结果表明,离心泵的扬程、流量在瞬时随转速上升而迅速增大,当启动时间较短时,存在较大的冲击扬程。给出了基于离心泵广义方程式的外特性数值模拟方法,预测了离心泵的启动瞬态外特性。给出了求解离心泵加速过程的内部三维非定常流动的数值模拟模型,采用动网格和滑移面实现流场的运动,选用大涡模拟(LES)描述湍流运动。数值计算结果与试验结果取得了较好的一致性,验证了离心泵启动过程三维瞬态流动计算的可行性。
In order to research the transient explicit performance and transient flow of the centrifugal pump during starting period,this paper introduces the transient performance test,the numerical simulation of transient flow and explicit performance.The experimental method of the transient performance and numerical simulation method of inner flow are present.The results show that the head and flow rate increase with the rotational speed.When the start time is shorter,the impact head is obvious.The method of generalized equation is used to predict the explicit characteristics of the centrifugal pump during starting period.The numerical simulation model of three-dimensional transient flow is established by dynamic mesh method and sliding mesh method,and LES simulation is used to describe the turbulent flow.The numerical results compared with the experimental results achieve better consistency,which verify the feasibility of three-dimensional transient flow numerations of the centrifugal pump during starting period.
基金
高等学校博士学科点专项科研基金(20060335084)
关键词
化工机械与设备
离心泵
数值模拟
瞬态特性
非定常流动
动网格
chemical machinery and equipment
centrifugal pump
numerical simulation
transient performance
unsteady flow
dynamic mesh
