ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Taking a cold store as the experimental objective, the inside environment, air curtain and outside environment of the cold store were simulated by a 3D coupled model. The unsteady simulation of the flow field of the air curtain was performed by using a CFD software and the temperature field inside the cold store was measured. The effects of the supply velocity, supply angle and jet width of the air curtain on its isolation ability were analyzed under the condition that the door and the air curtain were opened simultaneously. The results show that there is an optimal supply velocity and angle to make the air curtain has its best isolation performance and the temperature field inside the cold store has the smallest fluctuation. However, the jet width should not be too large. The optimal supply velocity, angle and jet width of the air curtain for this cold store are 8m/s, 15° and 0.04m, respectively.