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

According to the different movement characters of screw segment and centrifugal segment of liquid-solid two-phase flow in the screw centrifugal impeller and the structure characters of screw centrifugal pump impeller, the vane profile parameter equation group for variable-dip screw centrifugal pump was derived. The meridian velocity distribution can be changed though changing some parameters of the vane profile parameter equation group. Thus the better meridian velocity distribution could be found by using this method. Using the parameter equation group, the CAD and numerical simulation of 3-D flow field were also facilitated for screw centrifugal pump.