To describe extended orientation degree of polymer molecular chains in runner, effective extended strain S w is cited. 引入有效延伸应变SW来描述流道内分子链的延伸取向程度。
In the shape-improvement of blade, the inlet and outlet of blade need to be extended in order to improve the runner's unit speed, unit discharge and outlet circulation. 在混流式水轮机叶片改型中,为了改变转轮的单位转速、单位流量及出口环量,经常需要延长叶片进出水边。