离心泵转速剧烈波动时的瞬时响应特性研究  

Study of the Transient Response Characteristics of a Centrifugal Pump Undergoing a Drastic Fluctuation in the Rotating Speed

作　　者：赵燕娟[1] 张玉良[2] 

机构地区：[1]衢州职业技术学院信息工程学院,浙江衢州324000 [2]衢州学院机械工程学院,浙江衢州324000

出　　处：《热能动力工程》2016年第5期106-112,156,共7页Journal of Engineering for Thermal Energy and Power

基　　金：浙江省自然科学基金资助项目(LY14E090011);国家自然科学基金资助项目(51276172)

摘　　要：为研究离心泵转速剧烈波动时的瞬时响应特性,建立了包含一台低比转速离心泵的循环管路系统,基于用户自定义函数、滑移网格方法和RNG k-ε湍流模型对整个系统进行了非定常流动的自耦合数值计算。结果表明:流量响应滞后于转速变化历程,而扬程响应对转速变化的跟随性则较好;叶轮机械内部的动静干涉效应对转速加速阶段的泵出口压力和减速阶段的进口压力影响最为显著,而对流量和叶轮功率影响较小,转速波动过程中的瞬时流场演化完全滞后于准稳态计算结果。本研究为揭示离心泵转速剧烈波动时的瞬时响应特性提供了重要参考。To reveal in-depth the transient response characteristics of a centrifugal pump when it has a drastic fluctuation of the rotating speed,set up was a circulating pipeline system,including a set of low specific speed centrifugal pump. According to the function defined by users themselves,sliding mesh method and RNG k- ε turbulent flow model,an unsteady flow self-coupling numerical calculation was performed of the whole system. It has been found that the flow rate response lags behind the rotating speed variation course while the head response features a relatively good nature to follow up the rotating speed variation. The interference between the rotor and stator inside the turbomachinery exercises a most notable influence on the pressure at the outlet of the pump in the stage of the rotating speed acceleration and the pressure at the inlet of the pump in the stage of the rotating speed deceleration,however,exerts a relatively small influence on the flow rate and the power needed by the impeller. The evolution of the transient flow field in the process of the fluctuation in the rotating speed totally lags behind the quasi-steady state calculation results. The forgoing can offer important reference for revealing the transient response characteristics of a centrifugalpump.

关 键 词：离心泵 转速剧烈波动 自耦合计算 瞬时响应 准稳态假设 

分 类 号：TH311[机械工程—机械制造及自动化]