水泵水轮机制动工况转轮受力分析

发布时间：2018-03-04 21:16

本文选题：水泵水轮机　切入点：制动工况　出处：《排灌机械工程学报》2017年07期 　论文类型：期刊论文

【摘要】：为了研究水泵水轮机制动工况下转轮及叶片受力状况,以某抽水蓄能电站混流式水泵水轮机模型机为研究对象,对其选定开度下制动工况进行了定常与非定常数值计算,并与试验数据进行了对比验证,探讨了制动工况下的内流机理,定量分析了该工况下叶片载荷及转轮所受径向力.结果表明:该工况叶片进口处正、背面压力差值较大,易造成该处流动紊乱;叶片进出口及背面中部表面压力梯度和涡量较大,产生的旋涡对叶道内流动及轴与机组稳定有一定影响;转轮旋转过程中受到大小呈周期性变化的非对称性径向力作用,其周期数与叶片数相同,值为86.90~133.18 N,相差46.28 N;转轮区域出现双失速团旋转失速现象,其对叶片正面有间断性冲击作用,产生额外交替应力.因此水泵水轮机在进行工况转换时应尽量避开运行在飞逸线附近正斜率的制动区域.
[Abstract]:In order to study the force condition of runner and blade under the braking condition of pump turbine, the steady and unsteady numerical calculation of braking condition under the selected opening is carried out with the model machine of mixed flow pump turbine of a pumped storage power station as the research object. Compared with the experimental data, the internal flow mechanism under the braking condition is discussed, and the blade load and radial force of the runner are quantitatively analyzed. The results show that the pressure difference between the inlet and the back of the blade is large. The pressure gradient and vorticity of the inlet and outlet of the blade and the middle surface of the back of the blade are larger, and the vortex has a certain influence on the flow in the blade duct and the stability of the shaft and unit. The rotating wheel is subjected to asymmetric radial force with periodic changes in size, and the number of cycles is the same as the number of blades, with a difference of 46.28 N between 86.90 and 133.18 N, and the phenomenon of double stall rotating stall occurs in the region of runner. It has intermittent impact on the front of the blade, resulting in additional alternating stress. Therefore, the pump turbine should avoid the braking area of positive slope near the flight line as far as possible when carrying out the change of working conditions.
【作者单位】：兰州理工大学能源与动力工程学院;甘肃省流体机械及系统重点实验室;
【基金】：国家自然科学基金资助项目(51566009)
【分类号】：TV734.1

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