混流泵启动过程瞬态性能理论模型  

Theoretical model of transient mixed-flow pump start-up

作　　者：鲁阳平 马灿 谭磊[1] 韩亚东 LU Yangping;MA Can;TAN Lei;HAN Yadong(State Key Laboratory of Hydroscience and Engineering,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Science and Technology on Thermal Energy and Power Laboratory,Wuhan Second Ship Design and Research Institute,Wuhan 430205,China)

机构地区：[1]清华大学能源与动力工程系,水沙科学与水利水电工程国家重点实验室,北京100084 [2]武汉第二船舶设计研究所热能动力技术重点实验室,武汉430205

出　　处：《清华大学学报（自然科学版）》2022年第12期1938-1944,共7页Journal of Tsinghua University(Science and Technology)

基　　金：国家重点研发计划项目(2020YFB1901401);佛山-清华产学研合作协同创新专项(2020THFS0107);水沙科学与水利水电工程国家重点实验室自主科研项目(2021-KY-04);国家自然科学基金项目(51809148);北京市自然科学基金项目(3192015)。

摘　　要：混流泵在启动过程中,内部会出现流动冲击和旋转失速等现象,瞬态性能十分复杂。该文通过混流泵瞬态扬程方程和管路系统阻力方程的联立求解,建立了一套混流泵启动过程瞬态性能理论预测模型。通过给定转速加速曲线,得到混流泵启动过程中流量和扬程随时间的变化规律。同时,构建了混流泵与管路系统的三维几何模型,数值计算得到了混流泵启动过程瞬态特性,结果与理论模型预测结果吻合较好,验证了该理论预测模型的准确性。启动过程中,流量增大滞后于转速上升,转速加速结束后流量缓慢增长并最终趋于稳定。混流泵瞬态扬程可分为稳态项扬程、加速项扬程和惯性项扬程。加速项扬程和惯性项扬程在启动过程中影响较大。Start-up transients in mixed-flow pumps are very complex due to the flow variations and rotational stall during start-up. A transient head equation was solved with a pipe resistance equation in this study to give a theoretical model for the varying flow rate and head during start-up of a mixed-flow pump. The model included the rotational acceleration to predict the variation of the flowrate and head during start-up. The start-up was also modeled with a three-dimensional numerical model of the mixed-flow pump and pipe system to predict the transient pump characteristics. The model predictions agree well with the numerical results to validate the theoretical model. During start-up, the flowrate does not increase as fast as the speed but continues to slowly increase after the pump has reached the maximum rotational speed. The transient pump head can be divided into the steady-state head, the acceleration head and the inertia head with the acceleration and inertia heads greatly influencing start-up.

关 键 词：混流泵 启动 瞬态性能 理论模型 

分 类 号：TK72[动力工程及工程热物理—流体机械及工程]