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

Development of the flow model of scalariform perforation plates was introduced from domestic country to foreign country. The mathematics model of scalariform perforation plates was established. The simulation model of the flow in the region of scalariform perforation plates with different structures was established through Fluent software.From calculating and analyzing the simulation result, the influences of inclination angle of perforation plates, inner diameter of vessel, hole number, equivalent hole width to flow resistance coefficient were studied. The results showed that when other parameters were initialized, with the indination angle increasing, average flow was invariant, the drop of pressure on both side of perforation plates and flow resistance coefficient decreased at the beginning, and increased later. With the value of inner diameter increasing, average flow increased, the drop of pressure and flow resistance coefficient decreased. With hole number increasing, average flow was invariant, the drop of pressure and flow resistance coefficient increased. With equivalent hole width increasing, average flow was invariant, the drop of pressure and flow resistance coefficient decreased.