离心泵转速剧烈波动时的瞬时响应特性研究

发布时间：2018-04-03 23:38

  本文选题：离心泵　切入点：转速剧烈波动　出处：《热能动力工程》2016年05期

【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。
[Abstract]:In order to study the instantaneous response characteristics of centrifugal pump when its speed fluctuates violently, a circulating pipe system including a centrifugal pump with low specific speed is established, based on the user-defined function.Sliding grid method and RNG k- 蔚 turbulence model are used to calculate the unsteady flow of the whole system.The results show that the flow response lags behind the speed change process, but the lift response follows the speed change better.The influence of dynamic and static interference effect on pump outlet pressure at speed acceleration stage and inlet pressure at deceleration stage is most significant, but it has little effect on flow rate and impeller power.The evolution of transient flow field in the process of rotational speed fluctuation lags behind the results of quasi steady state calculation.This study provides an important reference for revealing the instantaneous response characteristics of centrifugal pump speed fluctuating violently.
【作者单位】： 衢州职业技术学院信息工程学院;衢州学院机械工程学院;
【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)
【分类号】：TH311
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本文编号：1707403