基于面元法预报导管桨性能的数值计算方法

Surface panel method-based numerical calculation for predicting ducted propeller performances

基于面元法,分别用将桨和导管当作一个整体考虑的直接计算方法、基于诱导速度的迭代计算方法与基于诱导速度势的迭代计算方法预报了导管螺旋桨的定常水动力性能.计算结果表明:采用这3种方法预报导管螺旋桨的定常性能具有相似的精度,但直接求解方法可以节省大量的计算时间;直接求解和速度势迭代计算的导管表面压力分布、桨叶表面环量和压力分布基本一致,但是与诱导速度计算的结果有一定的差异.对这3种方法计算结果的差异性分析表明:计算导管桨水动力性能时,直接求解方法和基于诱导速度势迭代方法更可靠.

On the basis of surface panel method,a directly solving method,in which the duct and propeller are taken into account as a whole,was used to predict the steady hydrodynamic performance of ducted propellers through induced velocity and induced velocity potential iterations.The calculation results show that the three methods have similar accuracy in the performance prediction,but the directly solving method can save much programming and calculating time.The pressure distribution on duct,circulation and pressure distribution on propeller which are computed by the directly solving method and potential iterative method are agreed well,but have some differences with the results of velocity iterative method.The analysis of the three methods shows that the directly solving method and the potential iterative method are more reliable than the velocity iterative method.