Influence of the hub ratio on the performance of a hubless pump-jet thruster

被引：0

作者：

Liu H. ^{[1
]}

Hua X. ^{[1
]}

Wu X. ^{[2
]}

Wu Z. ^{[1
]}

机构：

[1] Fluid Machinery Engineering Technology Research Center, Jiangsu University, Zhenjiang

[2] School of Energy and Power Engineering, Jiangsu University, Zhenjiang

来源：

Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2023年 / 44卷 / 01期

关键词：

energy performance; hub ratio; hubless pump-jet thruster; numerical simulation; operation characteristics; pressure pulsation; thrust characteristics; velocity distribution;

D O I：

10.11990/jheu.202106051

中图分类号：

学科分类号：

摘要：

In order to explore the influence of hub ratio on the internal flow characteristics of shaftless pump-jet propulsor, the internal flow characteristics of shaftless pump jet were numerically calculated and analyzed unsteadily under different hub ratios (0. 20, 0. 23, and 0. 25) based on RNG k-着 turbulence model and a multicoordinate system. The results show that with an increase in the hub ratio, the head, efficiency, and thrust of the model pump jet decrease slightly, the pressure gradient on the surface of the blade decreases from tip to rim, the velocity in the middle of the impeller decreases slightly, the center speed of the impeller increases gradually, the vortex strength at the impeller outlet first increases and then weakens, and the vortex area gradually expands toward the outlet of the exit extension section. In addition, with an increase in the hub ratio, the pressure fluctuations in the middle of the impeller increase slightly, with small pressure fluctuations at the wheel rim and center of the impeller. The main frequency at the center of the inlet and outlet is slightly lower than the shaft frequency, and the main frequencies at the other points are the same as the shaft frequency. When the hub ratio increases to 0. 25, the amplitudes of the main frequency of the pressure pulsation at the impeller outlet and the outlet extension section increase considerably. These research results can provide some reference for the optimization design of the shaftless pump-jet thruster. © 2023 Editorial Board of Journal of Harbin Engineering. All rights reserved.

引用

页码：146 / 153

页数：7

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