叶片数对无轴泵喷推进器性能的影响

为丰富无轴泵喷推进器噪声性能优化理论，研究了叶片数对无轴泵喷推进器性能的影响，重点探究了不同叶片数下无轴泵喷推进器内的压力脉动变化规律。基于计算流体力学中的有限体积法离散RANS方程，应用RNG k-ε湍流模型封闭计算模型，采用SIMPLEC进行压力-速度耦合，对不同叶片数下的无轴泵喷推进器内部流场进行了非定常数值模拟计算，并对计算结果进行了详细的对比分析。研究结果表明：随叶片数的增加，无轴泵喷推进器模型的扬程、效率和推力均逐渐增大，叶片表面压力分布更加均匀，叶轮轮缘和中部的压力脉动均明显降低，叶轮进出口主频处的压力脉动幅值从轮缘向中心逐渐减小。

Influence of blade number on performance of hubless pump-jet thruster

In order to enrich the optimization theory of hubless pump-jet thruster noise performance, the influence of blade number on the performance of hubless pump-jet thruster was studied, and the variation law of pressure pulsation in hubless pump-jet thruster with different number of blades was emphatically investigated. Based on the finite volume element method of computational fluid dynamics, the RANS equation was discretized, and the calculation model was closed by using RNG k-ε turbulence model, coupling the pressure-velocity by using the SIMPLEC. The unsteady numerical simulation of the flow field inside the hubless pump-jet thruster with different number of blades was carried out, and the calculated results were compared and analyzed in detail. The study results show that with the increase of blade number, the head, efficiency and thrust of hubless pump-jet thruster model increase gradually. The pressure distribution on the blade surface becomes more uniform. The pressure pulsations of the impeller rim and the middle part decreased obviously. The amplitude of pressure pulsations at the main frequencies of impeller inlet and outlet decreases gradually from rim to center.