气孔排数对带排气航行体绕流流动影响研究  

Effect of Number of Rows of Venting Holes on Flow Around an Underwater Vehicle With Pressure-equalizing Exhaust

作　　者：马贵辉 陈浮[1] 俞建阳[1] MA Gui-Hui ,CHEN Fu ,YU Jian-Yang(School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, Chin)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,哈尔滨150001

出　　处：《工程热物理学报》2018年第9期1945-1951,共7页Journal of Engineering Thermophysics

基　　金：国家自然科学基金委创新研究群体(No.51421063)

摘　　要：数值研究了航行体垂直出水过程中单排孔排气、双排孔组合排气对贴体气膜及绕流流场的影响。结果表明,相比单排孔方案,双排孔方案孔排间"逆向流动"诱导气膜覆盖后排孔表面,航行体侧向水流对气膜的剪切作用减弱,排气早期气膜形成速度快,空间尺寸大;孔排间表征马蹄涡位置的分离鞍点随模型运动逐渐推进至后排孔前缘,马蹄涡向下游发展过程中在主气膜两侧分割出局部条状气膜;组合排气后排孔近似垂直航行体表面排气,气孔下游较强肾型涡聚拢气膜两侧气体并将其抬离壁面,某些情况下不利于气膜的周向融合。Vertical emerging processes of an underwater vehicle with one and two rows of holes exhaust are numerically simulated to investigate its influence on the evolution of air film and flow field around vehicle＇s exterior. Results show that when compared with the single-row hole case, exhausting with two rows of holes brings about the ＂reverse flow＂ which induces the film covering the exits of back holes, as a result the shearing action that air film suffers from crossing water is weakened, leading to the faster axial extension and spatial expansion of air film. The separation saddle point, which represents the location of horseshoe vortex, gradually moves to the leading edge of back holes as vehicle moves, and the downstream motion of horseshoe vortex isolates two parts of air film from both sides of the main air film. The air injection of back holes is nearly normal to vehicle＇s exterior for the arrangement of front holes. The stronger counter-rotating vortex pair inside film gathers the air at both sides of air film and soon after lifts it up, which may go against the circumferential coalesce of film.

关 键 词：水下航行体 等压排气 单、双排孔 流场结构 

分 类 号：O351.2[理学—流体力学]