喷水推进进口流道倾斜角对其效率影响分析

喷水推进进口流道特征参数较多，各参数之间相互联系，当改变其中某个特征参数时，其他参数也会发生改变。本文通过推导得出各特征参数之间的关系，并以此为基础，在给定进口流道特征直径 D、流道高度H、流道总长度L的条件下，以流道倾斜角为变量，开展进口流道的设计和建模，借助 CFD技术研究进口流道效率与流道倾斜角之间关系。研究结果表明，在一定范围内进口流道效率会随着流道倾斜角的增加而降低，但是下降幅度不大。这一重要结论对进口流道结构与水动力权衡设计有较强的指导意义。

Analysis about affect of inclination angle on the efficiency of the waterjet propulsion inlet duct

There are many feature parameters describing waterjet propulsion inlet duct and these parameters are related. When some dimensionischanged, the other ones are altered along with that. This paper concludes the relationship of these parameters through derivation. On the basis of that, in the condition that the inletduct feature diameterD, the height of duct H, the overall length of ductL are given, taking the duct inclination angle as variable, it designs and establishes models to research the relationship between inlet duct efficiency and inclinationangle through CFD technology. The result reveals that the inlet duct efficiency decreases with the rising of the inletduct inclination angle. However the decrease value is little. So to some extends, the inlet duct inclination angle has little affect on the inlet flow duct efficiency. This conclusion has great guiding significance in designing inlet duct.