基于自由曲面变形方法的离心泵叶片反问题方法研究

提出了一种基于自由曲面变形(FFD)方法的离心泵叶片反问题新方法。采用自由曲面变形方法对叶轮叶片形状进行控制,将叶片空间曲面嵌入到一个均匀剖分的三参数张量积控制体内,移动控制晶格点位置使控制体发生变形,控制体内的叶片曲面形状随之改变。根据给定的叶片目标载荷分布进行叶片形状的控制,构建控制晶格点的变形函数,根据叶轮内三维湍流数值模拟结果与期望的叶片载荷分布规律控制晶格点的变形,实现了由物理参数对叶片形状的直接控制。算例计算结果表明,所提出的基于FFD方法的离心泵叶片反问题方法是可行的。

New Inverse Method of Centrifugal Pump Blade Based on Free-form Deformation

A new inverse method for centrifugal pump blade based on free-form deformation, which is used to parametric control of the pump blade shape, was proposed. The blade was implanted to a trivariate control volume which is equally subdivided by control lattices. The control volume can be deformed by moving the control lattices in it, thereupon the object is deformed. The parametric method for the blade shape according to the distribution of the blade load was proposed, and the lattices deformation function was constructed. The deformation of the lattices was implemented according to the three dimensional turbulent flow solve in pump and the desired load distribution of blade. At last, the blade shape was controlled by the physical parameters. The calculation case shows that the proposed inverse method based on FFD method is rational.