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基于粘势耦合方法的空泡水筒阻塞效应数值模拟与分析
Numerical simulation and analysis of blockage effect in cavitation tunnel based on viscous/potential coupling method
龚正琦, 董小倩
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作者单位:上海交通大学 海洋工程国家重点实验室, 上海 200240
中文关键字:空泡水筒;阻塞效应;RANS模拟;势流方法
英文关键字:cavitation tunnel; blockage effect; RANS simulation; potential flow method
中文摘要:阻塞效应修正是提高空泡水筒水动力测量结果精度的重要措施。本文以上海交通大学新空泡水筒为研究对象,采用粘势耦合方法预报某7叶螺旋桨盘面处的实效伴流场,以此修正螺旋桨进速实现空泡水筒的阻塞效应修正。首先采用面元法对螺旋桨进行敞水预报,建立体积力模型将其力场插值到RANS网格中进行计算,得到桨盘面的实效伴流场。然后根据实效伴流分数归纳进速修正公式对螺旋桨推力和扭矩曲线进行修正,从而实现了空泡水筒到敞水结果的阻塞效应修正。结果表明,空泡水筒中计算的推力和扭矩曲线修正后与敞水中的计算吻合良好。
英文摘要:The blockage effect correction is an important aspect to improve the hydrodynamic measurement accuracy of the cavitation tunnel. In this paper, a viscous/potential coupling method is carried out to predict the effective wake field of a seven-bladed propeller and to correct the blockage effect of the new cavitation tunnel of Shanghai Jiao Tong University. Firstly, a potential flow based panel method is utilized to predict the open water performance of the propeller. Then the predicted force field is interpolated to RANS model to evaluate the effective wake field at the propeller plane. The open water characteristic curves are adjusted by using the predicted effective wake fraction. The presented approach realizes blockage effect correction from cavitation tunnel to open water. The results show that the corrected thrust and torque curves in the cavitation tunnel are in good agreement with those calculated in the open water.
2018,40(9): 21-26 收稿日期:2017-10-15
DOI:10.3404/j.issn.1672-7649.2018.09.004
分类号:U664.33
作者简介:龚正琦(1993-),男,硕士研究生,研究方向为船舶推进器水动力学
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