舰船尾流及其气泡数密度分布的数值计算

以舰船尾流为水下武器平台的探测对象,研究尾流气泡数密度(BND)分布.采用改进后的雷诺平均Navier-Stokes流动模型和气泡输运理论,建立数值计算模型对尾流BND分布进行计算,并用实测数据验证计算模型.计算结果表明:在纵向上随着离船距离的增大,尾流宽度成小角度扩散;而尾流的深度增幅较大,船尾后方3 000 m处的...

Numerical Calculation of Ship Wake and Its Bubble Number Density Distribution

As the detective object for an underwater weapon platform,the ship wake and its bubble number density(BND) distribution are studied.The modified Reynolds-averaged Navier-Stokes fluid dynamical model and the bubble transport theory are taken to establish a numerical model to calculate the wake BND distribution,and the model is verified by measurement data.The study results show that the wake flow expands along the wake in a small angle while its depth increases greatly,by about 2 times at location of 3000m behind the stern.And the total BND decreases along the wake flow with the increase of distance from the stern.However,in near field,the total BND attenuates rapidly while slowly in far field.The total BND in the eddy flow area behind propellers of the ship is much higher than those in other locations.The bubbles with radius between 10μm and 200μm survive for the longest time in the ship wake.