吊舱推进器桨毂间隙影响的数值分析

以拖式吊舱推进器为对象，采用求解RANS（Reynolds Averaged Navier Stokes）方程的方法研究桨毂间隙对水动力性能的影响，应用滑移网格技术处理桨叶与吊舱的非定常相互作用.分别计算了具有不同间隙宽度的模型，以考察有、无间隙以及间隙宽度变化对推进器各部分水动力的影响.计算结果表明：桨毂间隙对推进器单元水动力及桨叶水动力的影响均很小；桨毂间隙内压力作用于桨毂后端面形成推力，其大小约为桨叶推力的2%~3%；桨毂后端面与桨叶随边的距离一定时，间隙内压力随间隙宽度的增大而降低.

Numerical Simulation of Steady Hydrodynamic Performance of a Pump-jet Propulsor

The numerical model of integrative internal and external flow field of underwater vehicle equipped with a pump-jet propulsor was established. The computational region discretization was conducted by using high quality multi block structure grid. The steady hydrodynamic performance was calculated by adopting Reynolds time averaged method, SST k-ω turbulence model and finite volume method. The open water performance curve was given, indicating that the pump-jet propulsor had a high efficiency and ideal balance of performance. Pressure distributions along the meridian of vehicle hull and at various heights of blade were analyzed. The tip vortex of the rotor was displayed and explained. The velocity components were discussed in the location before the rotor, in the middle of the gap and behind the stator. The comparison with the results of the full stage model showed that the single stage model was applicable and feasible for the research.