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 limitation of traditional inverse problem of centrifugal pump blade and its optimization, the free form deformation (FFD) inverse method of centrifugal pump impeller based on load driving was proposed to design the centrifugal pump impeller. A more stable and effective deformation function was established. The centrifugal pump blade load was parameterized by using sectional spline according to the characteristic of centrifugal pump impeller load. The design of experiment was implemented in the designed variables space, and the response surface method was introduced to optimize the distribution of blade load. The three-dimensional transient turbulent flow in pump was simulated by using commercial software. The control and deformation of blade shape and analysis of blade load were implemented by Matlab code. The computation of FFD and CFD was coupled. The relationships between distribution of blade load, blade shape and its hydraulic performance were analyzed. The reasonable distribution of blade load for low specific speed pump blade was deduced. The calculation case results showed that the proposed centrifugal pump blade load optimization theory and method were rational.