摘要
针对我国轴流泵以及轴流式水轮机效率普遍偏低的情况,考虑到轴流叶片外缘、轮毂处的边界层及间隙流的影响,在轴流式叶片设计的传统升力法模型中引入修正系数A(R,δ)进行改进,得到了改进升力法设计模型,并同时应用传统升力法和改进升力法对一轴流式水泵和水轮机叶片进行了对比设计,并利用NUMECA软件进行流动模拟,分别得到转轮(叶轮)叶片表面及轮毂、轮缘处的速度-压力分布以及各工况的效率计算结果,证明了改进升力法较传统升力法好,改进效果显著,有效地提高了轴流式水力机械的效率,改善了轴流式水力机械内部流动的速-压分布。为轴流式叶片的设计提供了一种新的计算模型。
Due to insufficient high level of commonly used axial pumps and axial turbines, and considering the boundary layer on the blade periphery and hub and the clearance flow. A revised coefficient A（R,δ） is introduced in blade hydraulic design based on traditional lifting force method. Comparison was done between traditional one and revised one in blade designs for axial pump and axial turbine. NUMECA code was used to carry out the flow simulation the velocity and pressure distribution on the blade near the hub and periphery were calculated the results of calculated efficiencies for some operating points are also obtained. It shows that revised lifting force method is better than traditional one, it can improve the efficiency of axial machines greatly and improve the pressure and velocity distribution too. This paper provides a machines new calculation model for axial machines.
出处
《大电机技术》
北大核心
2009年第5期38-42,共5页
Large Electric Machine and Hydraulic Turbine
基金
四川省教育厅重点项目资助(项目编号:2006A089)
