摘要
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处的尾流深度约增加1倍。尾流中BND总量随着离船距离的增大而递减,在近尾流处衰减速度很快,远尾流处衰减比较缓慢,船尾螺旋桨后方涡流区的BND总量远高于其他位置。半径在10～200μm之间的尾流气泡存活时间最长。
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 3000m 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 10μm and 200μm survive for the longest time in the ship wake.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2011年第3期315-320,共6页
Acta Armamentarii
关键词
流体力学
舰船尾流
气泡
气泡数密度
fluid dynamics
ship wake
bubble
bubble number density
