泵喷水动力性能预报及导管拱度的影响分析

Hydrodynamic performance prediction of a pump jet and impact analysis of a duct camber

为研究泵喷梢隙流动的影响,本文基于面元法理论建立了泵喷组件间的干扰数值模型和梢部泄露涡模型。将不同工况下推进性能的计算结果与CFD方法的结果进行对比,对比结果表明,转子梢部的泄露涡对周围流场存在强烈的扰动,引入梢涡模型可以有效地改善泵喷定子和转子的性能预报精度。在此方法的基础上,通过改变导管翼型剖面的拱度值,分析不同拱度的导管对泵喷水动力性能的影响,分析结论显示,增加拱度可以显著地提高泵喷的推进效率和有效做功范围,直至当导管表现为减速型导管时,推进性能的提高幅度降低;最后针对装配在高速水下航行体的泵喷推进器,给出了导管拱度的建议取值范围。

In order to accurately predict the effect of tip clearance flow of a pump jet,this paper builds the interference numerical model between the pump jet components and the tip leakage vortex model based on the surface element theory.To validate the accuracy,the calculation results of the propulsion performance under different working conditions are compared to the results of the computational fluid dynamics(CFD)method.The comparison shows that the leakage vortex of the rotor tip has a strong disturbance on the surrounding flow field.The introduction of the tip vortex model can effectively improve the performance prediction accuracy of the pump jet thruster′s stator and rotor.On the basis of this method,the influence of ducts with different cambers on the dynamic performance of the pump jet hydrodynamic performance was analyzed by changing the camber value of the duct airfoil profile.The analysis shows that increasing the camber can significantly improve the propulsion efficiency and effective work range of pump jet.The improvement of the propulsion performance was reduced when the duct exhibited a deceleration effect.Finally,the recommended range of duct camber value will be given for the pump jet fitted in the high-speed underwater vehicle.