基于流道倾角对喷水推进泵流道性能的影响研究

利用参数化方法设计了4种不同流道倾角的喷水推进泵椭圆形进水流道,并采用三维雷诺平均N-S方程和RNGκ-ε湍流模型对其流场和性能进行数值仿真.从流道的出流均匀性、流动分离方面来分析在保持进口速比不变,不同流道倾角时流道内流场的变化情况,为喷水推进器进水流道倾角的设计提供依据.计算结果表明:流道倾角对喷水推进泵水力性能和流场变化影响较大.在设定进速比的条件下,随着流道倾角的增大,喷水推进泵流道出口的流场均匀性变差,流道内部更容易发生流动分离现象,且在流道倾角为47°时的喷水推进泵在设计工况下的流场特性最差.

Research on the influence of waterjet duct performance based on inclination of waterjet duct

Four different inclination waterjet duct of an elliptic inlet are designed by the parametric method, and the flow field and performance are simulated by using the three-dimensional Reynolds averaged N-S equation and S-Aturbu-lence model. The flow field in different inclination waterjet duct is analyzed from discharge uniformity of the duct, flowsep-aration aspects with inlet velocity ratio unchanged, so that the design basis of the inclination waterjet duct is provided. The calculation results show that the inclination of waterjet duct have great influence on the flow field and hydraulicperform-ance. Under the condition of setting into the inlet velocity ratio, with the increase of the inclination angle of waterjet duct, the flow field of waterjet duct is more uniformity, the cavitation phenomenon of the duct is more likely to occur, and when the inclination angle of waterjet duct attain 47°, flow field characteristics of waterjet duct at the design condition is the worst.