期刊文献+

关死点处离心泵启动过程的数值模拟 被引量:2

Numerical Simulation of Unsteady Flow in Centrifugal Pump During Startup Period at Shut-Off Condition
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摘要 离心泵在瞬态过程中的瞬态性能正受到越来越多的关注,其中启动特性是目前研究与应用最为广泛的。为防止功率过载,离心泵通常在关闭出口阀门状态下启动。为研究瞬态性能,本文通过数值模拟技术,对一台低比转速离心泵在闭阀快速启动过程中的内部流场进行了不可压缩、非定常、粘性流动的数值模拟。其中压力与速度的耦合采用SIMPLE算法实现。研究表明:随着启动过程中转速的不断提高,动静干涉效应将更为明显;无量纲扬程在启动初始阶段存在极大值,随后快速减少至最小值,而后缓慢上升至稳定的波动值,该过程表现出明显的瞬态效应;准稳态假设不适合用来进行准确瞬态行为预测。总之本研究将为各类涡轮机械的瞬态特性研究提供了参考。 The research on the transient performance of centrifugal pumps has attracted increasing attention during operating periods, wherein the study and application of the startup performance are most wide. To avoid power overload, centrifugal pumps usually start in the case of closed discharge valve. The numerical simulation of incompressible, unsteady, and viscous flow were carried out for a low-specific- speed centrifugal pump to analyze the transient behavior during startup period in the case of closed dis- charge valve. The SIMPLE algorithm was used to accomplish the coupling calculation between pressure and velocity. The results show that rotor-stator interaction becomes stronger with the growing rotational speed. The maximum of non-dimensional head presents at the very beginning of startup, and fast falls be- low quasi-steady value, then rises to quasi-steady value again. The whole process presents obvious transi- ent behavior. Quasi-steady hypothesis can be not competent of predicting the transient characteristics well. In conclusion, the present study provides the valuable reference for the research on transient behav- ior in all kinds of turbomachineries.
出处 《力学季刊》 CSCD 北大核心 2012年第3期436-442,共7页 Chinese Quarterly of Mechanics
基金 国家自然科学基金项目(No21076198) 国家重点基础研究发展计划973项目(No2009CB724303)
关键词 离心泵 关死点 启动 数值模拟 瞬态行为 centrifugal pump shut-off condition startup numerical simulation transient behavior
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参考文献10

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二级参考文献14

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共引文献57

同被引文献22

  • 1王乐勤,吴大转,郑水英,胡征宇.混流泵开机瞬态水力特性的试验与数值计算[J].浙江大学学报(工学版),2004,38(6):751-755. 被引量:23
  • 2袁哲,马文星,卢秀泉,胡晶,杨珊珊.液力减速器动态制动性能预测分析[J].吉林大学学报(工学版),2013,43(S1):160-164. 被引量:8
  • 3吴大转,王乐勤.高速混流泵汽蚀特性与汽蚀性能改善方法[J].农业机械学报,2006,37(9):93-96. 被引量:10
  • 4吴大转,王乐勤,胡征宇.离心泵快速启动过程外部特性的试验研究[J].工程热物理学报,2006,27(1):68-70. 被引量:34
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