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

The internal flow in impeller and volute of QW950—15—55 double-channel passage pump was investigated. Based on the Reynolds-averaging N—S equations and standard k—ε two-equation turbulent model, the simulations of turbulent flow between impellers are performed by using the flow computing software Fluent under different operating conditions. Important flow features were obtained. With the computing result, the distribution of velocity and pressure in the impeller was analyzed. The pressure and velocity distribution in impeller are similar to those in general centrifugal pump. Obvious asymmetry of flow field was observed in impeller in case of large flow operating condition. The internal flow in impeller is mixed spiral flow and the vortex core resulted by relative eddy is close to the back blind flange and pressured side. The circumferential distribution of pressure and absolute velocity at the outlet of impeller is periodic, which is corresponding to the periodicity of the passages of impeller. The asymmetry of pressure is relatively weak but that of velocity is strong. Comparing the data of efficiency with the head produced by experiment and CFD, the result mainly tallies. 