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Numerical analysis of unsteady hydrodynamic performance of pump-jet propulsor in oblique flow
International Journal of Naval Architecture and Ocean Engineering ( IF 2.2 ) Pub Date : 2019-10-11 , DOI: 10.1016/j.ijnaoe.2019.10.001
Chengcheng Qiu , Guang Pan , Qiaogao Huang , Yao Shi

In this study, the SST kω turbulence model and the sliding mesh technology based on RANS method have been adopted to simulate the exciting force and hydrodynamic of a pump-jet propulsor in different oblique inflow angle (0°, 10°, 20°, 30°) and different advance ratio (J = 0.95, J = 1.18, J = 1.58).The fully structured grid and full channel model have been adopted to improved computational accuracy. The classical skewed marine propeller E779A with different advance ratio was carried out to verify the accuracy of the numerical simulation method. The grid independence was verified. The time-domain data of pump-jet propulsor exciting force including bearing force and fluctuating pressure in different working conditions was monitored, and then which was converted to frequency domain data by fast Fourier transform (FFT). The variation laws of bearing force and fluctuating pressure in different advance ratio and different oblique flow angle has been presented. The influence of the peak of pulsation pressure in different oblique flow angle and different advance ratio has been presented. The results show that the exciting force increases with the increase of the advance ratio, the closer which is to the rotor domain and the closer to the blades tip, the greater the variation of the pulsating pressure. At the same time, the exciting force decrease with the oblique flow angle increases. And the vertical and transverse forces will change more obviously, which is the main cause of the exciting force. In addition, the pressure distribution and the velocity distribution of rotor blades tip in different oblique flow angles has been investigated.



中文翻译:

斜射流中射流推进器非定常水动力性能的数值分析

在这项研究中,SST ķ-ω采用湍流模型和基于RANS方法的滑动网格技术模拟了在不同斜入角(0°,10°,20°,30°)和不同进给比(J  = 0.95,J  = 1.18,J = 1.58)。已采用完全结构化的网格和全通道模型来提高计算精度。进行了不同进给比的经典偏斜船用螺旋桨E779A的验证,验证了数值模拟方法的准确性。网格独立性已得到验证。监测泵喷推进器在不同工况下的激振力的时域数据,包括轴承力和脉动压力,然后通过快速傅里叶变换(FFT)将其转换为频域数据。给出了不同提前比和不同斜流角下轴承力和脉动压力的变化规律。提出了在不同的斜流角和不同的前进比下脉动压力峰值的影响。结果表明,随着前进比的增加,激振力增加,越靠近转子域且越靠近叶片尖端,脉动压力的变化越大。同时,激振力随着斜流角的增加而减小。垂直力和横向力的变化将更加明显,这是激发力的主要原因。此外,还研究了不同斜流角下转子叶片叶尖的压力分布和速度分布。垂直力和横向力的变化将更加明显,这是激发力的主要原因。此外,还研究了不同斜流角下转子叶片叶尖的压力分布和速度分布。垂直力和横向力的变化将更加明显,这是激发力的主要原因。另外,研究了不同斜流角下转子叶片叶尖的压力分布和速度分布。

更新日期:2019-10-11
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