能量回收透平多工况内流损失和压力脉动特性研究

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中文摘要：能量回收透平对降低海水淡化系统的能耗具有重要的作用.为了解决能量回收透平性能偏低的问题,对一台离心式能量回收透平内部的流场和压力脉动进行了研究.首先,基于 SST k-ω湍流模型,计算分析了多工况关键部件内的漩涡分布特性;然后,通过试验测试了透平多工况的性能曲线;最后,研究了透平内部的压力脉动特性.研究结果表明:透平的高效区位于 1.0 Qd～1.2 Qd工况下;在额定工况下,流体与叶片之间的相互影响微弱,能量损失最低;在 1.2 Qd 工况下,叶片进口压力面和吸力面均存在漩涡,压力面的漩涡是由流体与叶片发生撞击产生的,吸力面的漩涡是由于流体发生分离现象产生的.叶轮进口 P11m 的压力脉动幅值最大为 0.019.由此可见,透平的高效区存在偏大流量工况,因此设计时应适当在偏小流量工况下,有利于多工况高效运行.

外文标题：Flow loss and flow induced vibration characteristics in hydraulic turbines under multiple conditions

外文摘要：The energy recovery turbine plays an important role in reducing the energy consumption of seawater desalination systems.In order to solve the problem of low performance of energy recovery turbines,the flow field and pressure pulsation characteristics inside a centrifugal energy recovery turbine were studied.Firstly,the velocity streamline distribution characteristics of key components under multiple operating conditions were calculated and analyzed based on SST k-ω turbulence model.Then,the performance curves of the turbine under multiple operating conditions were tested through experiments.Finally,the pressure pulsation characteristics inside the turbine were studied.The research results indicate that the high-efficiency zone of the turbine is located in the operating conditions of 1.0 Qd～1.2 Qd.At rated operating conditions,the interaction between the fluid and the blade is weak,resulting in the lowest energy loss.Under the1.2 Qd operating condition,there are vortices on both the inlet pressure surface and suction surface of the blade.The vortices on the pressure surface are generated by the collision between the fluid and the blade,while the vortices on the suction surface are generated by the separation phenomenon of the fluid.The maximum amplitude of pressure fluctuation at the inlet of the impeller P11m is 0.019.It can be seen that the high-efficiency zone of the turbine is biased towards high flow conditions,so the design should be appropriately biased towards low flow conditions,which is conducive to efficient operation under multiple operating conditions.

外文关键词：

centrifugal energy recovery turbineSST k-ω turbulence modellarge flow conditiondistribution characteristics of vortexpressure fluctuationperformance curves

作者：

谭正生、祁炳、袁学平

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作者单位：

重庆化工职业学院智能制造与汽车学院,重庆 401228

兰州理工大学能源与动力工程学院,甘肃兰州 730050

关键词：

离心式能量回收透平 SST k-ω湍流模型流量工况漩涡分布特性压力脉动性能曲线

基金：

重庆市自然科学基金面上项目重庆市职业教育教学改革研究项目

项目编号：

CSTB2022NSCQ-MSX0490GZ223210

出版年：

2024

DOI：

10.3969/j.issn.1001-4551.2024.08.018

机电工程

浙江大学　浙江省机电集团有限公司

机电工程

CSTPCD北大核心

影响因子：0.785

ISSN：1001-4551

年,卷(期)：2024.41(8)