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 design method of 3-element centripetal-turbine hydrodynamic torque converters was investigated. A new design method based on torus streamline was proposed. The particle movement inside the hydrodynamic torque converter was considered as the curvilinear movement on a torus surface, and could be decomposed into meridional component movement and circumferential component movement. The meridional streamline equations and torus streamline equations were derived. The blade influence on streamline was analyzed and a streamlined thickness function was put forward. The equations of blade camber line combined with the thickness function, the blade surface equation was obtained. The research result shows that either a meridional streamline or a torus streamline is an approximate parabola. 