Effect of Hub-to-tip Ratio on Performance of High Speed Pump-jet Propulsor for Undersea Vehicle
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摘要: 为了探究轮毂比对水下航行器高速泵喷推进器的影响, 以比转速1 920的叶轮为研究对象, 对水下航行器高速泵喷推进器3种不同的轮毂比开展数值计算、性能结果分析比对和试验验证。应用Fluent软件, 采用基于雷诺平均N-S方程和SST k-ω模型, 预测叶轮的扬程、效率及推力。通过数值仿真计算, 得到不同轮毂比叶轮的性能曲线、空化性能数据及内流场状态。结果表明: 叶片表面从叶梢到轮缘的压力梯度逐渐变小, 随着轮毂比的增大, 叶片上最大静压下降, 泵喷推进器的扬程和效率均有所降低, 且空化性能下降明显, 但在空化状态上优于小轮毂比。研究结果可为水下航行器高速泵喷推进器结构优化设计提供参考。Abstract: To investigate the influence of the hub-to-tip ratio on the high-speed pump-jet propulsors of undersea vehicles, this study took an impeller with specific speed of 1 920 as the research object and conducted numerical calculation, performance result analysis and comparison, and experimental verification of three different hub-to-tip ratios of a high-speed pump-jet propulsor for undersea vehicles. Using Fluent software, it adopted a Reynolds-averaged N-S equation and an shear stress transport k-ω model to predict the head, efficiency, and thrust of the impeller. The performance curves, cavitation performance data, and internal flow field conditions of the impeller under different hub-to-tip ratios were obtained through numerical simulation calculations. The results show that the pressure gradient on the blade surface from the blade tip to the rim decreases. With the increase in the hub-to-tip ratio, the maximum static pressure on the blade and the head and efficiency of the pump-jet propulsor all decrease, and the cavitation performance significantly declines. However, the cavitation state is superior to that at the small hub-to-tip ratio. The research findings can provide certain reference for the structure optimization design of high-speed pump-jet propulsors for undersea vehicles.
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Key words:
- undersea vehicle /
- hub-to-tip ratio /
- pump jet propulsor /
- cavitation
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图 6 泵喷推进器外特性对比曲线
Figure 6. Comparison curves of external characteristic of the pump jet propulsor
图 7 不同轮毂比下叶片速度迹线图
Figure 7. Velocity traces of the blade at different hub-to-tip ratios
图 8 不同轮毂比下叶片吸力面压力分布
Figure 8. Pressure distribution on the suction surface of the blade at different hub-to-tip ratios
图 9 不同轮毂比下叶轮压力面压力分布
Figure 9. Pressure distribution on the pressure surface of the impeller at different hub-to-tip radios
图 11 不同轮毂比下推力系数变化
Figure 11. Variation of thrust coefficient at different hub-to-tip ratios
图 14 不同轮毂比下各空化状态性能示意图
Figure 14. Performance of different cavitation state at different hub-to-tip ratios
图 15 σ=4.72时不同轮毂比下泵喷推进器汽相体积分数
Figure 15. Vapor phase volume fraction at different hub-to-tip ratios under σ=4.72
表 1 网格无关性检验方案
Table 1. Schemes of grid independence test
方案 网格数量 效率/% 轴功率
(无量纲)扬程
(无量纲)1 3 054 015 71.2 0.967 0.95 2 3 831 030 72.5 0.987 0.97 3 4 875 584 73.8 0.995 0.98 4 6 500 471 75.0 1.000 1.00 5 7 849 631 75.1 1.011 1.01 
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