采用带梢隙涡模型的面元法预报泵喷水动力性能

摘要

为了预报泵喷推进器水动力性能,采用面元法建立了定常水动力干扰模型,将泵喷分为转子-桨毂和定子-导管两个系统,系统间的干扰通过诱导速度进行考虑.针对定转子的几何外形,提出了基于圆台面的叶片网格划分方法;并根据泵喷内部流动的真实情况,提出了适用于平顶式叶片的梢隙涡模型.通过从压力、环量以及推进性能等方面的结果对比,发现当泵喷考虑梢涡的影响时,转子叶片的整体环量分布以及梢部载荷更接近实际情况,性能曲线与粘流结果吻合良好,表明该方法可以有效地预报泵喷推进器定常水动力性能.%In order to predict the hydrodynamic performance ofa pumpjet,surface panel method is used to establish a steady hydrodynamic interaction model.Interaction between different systems is considered through induced velocities.Considering geometric shapes of stator and rotor,a meshing technique for blade based on circular conical surface is proposed.According to the actual internal flow of the pumpjet,a tip leakage vortex model for the blades with flat top is also proposed.The comparison of results including pressure,circulation and propulsion performance,shows that when the influence of the tip leakage vortex is considered,the overall circulation distribution of rotor blades and the tip lead are closer to the actual situation.The performance curves agree well with the results of viscous flow,which indicates that the proposed method for pumpjet propulsion can effectively predict the steady hydrodynamic performance.