半浸桨叶剖面的变参数水动力性能分析

Variable Parameter Hydrodynamic Performance Analysis of Surface Piercing Propeller Blade Profile

为了优化半浸桨叶剖面的设计,建立了一种半浸桨叶剖面的参数化建模方式,采用重叠网格技术和VOF自由液面捕捉技术对半浸桨叶剖面入水问题进行了数值模拟。在此基础上,通过控制半浸桨叶剖面杯型随边上、下表面的曲率和厚度,进行水动力性能分析,绘制了半浸桨叶剖面设计图谱。分析表明,若增大半浸桨叶剖面的随边曲率或随边厚度,横向及垂向力系数会有所增大,敞水效率会降低;在下表面曲率一定的情况下,减小随边上表面曲率对半浸桨叶剖面入水过程的水动力特性有不利影响。

In this paper,a parametric modeling method of surface piercing propeller blade profile is established.The water entry problem of surface piercing propeller blade profile is numerically simulated by using overlapping grid technology and VOF free surface capture technology.On this basis,the variable parameter hydrodynamic performance analysis is carried out by controlling the edge curvature and edge thickness of the cup-shaped upper and lower surfaces of the blade profile.On this basis,the map of the variable parameter profile design of the surface piercing propeller blade profile is drawn,which provides a certain reference for the optimal design of the surface piercing propeller.Finally,it is concluded that the lateral force coefficient and vertical force coefficient will increase and the efficiency will decrease if the edge curvature or edge thickness of the blade section is increased.Moreover,if the lower surface curvature is constant,reducing the upper surface curvature along the trailing edge will have an adverse impact on the hydrodynamic characteristics of the water entry process of the blade profile.