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

To analyze the influence of angle of labyrinth channels to the hydraulic performance of emitter, Fluent 6.2 CFD software was used to study the sawtooth, trapezoid and rectangle channels with the different angles. The results showed negative relationship between angle and discharge coefficient and flow state exponent when the other conditions did not change. With the increasing of angle the discharge coefficient of trapezoid labyrinth channels decreased by 19.03 percent, the hydraulic performance of rectangle labyrinth path was similar with trapezoid flow path; it was apparent change to local damage coefficient ζt with the increasing of angle,，the ζt of trapezoid labyrinth path increased by 32.5 percent, but sawtooth flow path increased by 23.4 percent in the changing range of angle; when the working pressure was higher, the fraction coefficient was stabilized to value and changed nothing, the state of wateris keeping turbulence.