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

Numerical simulations were conducted on a three-stage helicon-axial multiphase pump under different conditions of gas volume fraction (GVF). Water was chosen as the first phase and ideal air was the second phase. k-ω SST turbulence model and dispersed phase zero equation model were selected to simulate the liquid-gas two-phase steady and unsteady flow. The hydraulic performance of the pump according to the simulations was well coincident with the experimental results. The results show that GVF and total volume flow declined smoothly from the first stage to the third for the compressiblity of gas. Due to different centrifugal forces on the two phases, the gas was distributed mainly around the hub; with the increase of GVF, the differential pressure of the first stage decreased slowly while the second and third stagesincreased at first and then decreased. When the inlet GVF was less than 10% or more than 80% , the differential pressure among the three stages were close, so the design and simulation in these conditions could regard as the imcompressible fluid. But in other conditions, it was necessary to consider the fluid as the compressible one; because of the stator-rotor interference and limited number of blades, the average pressure decreased at the interface between impeller and diffuser.