mean velocity in vertical meaning in Chinese

垂线平均流速

( 3 ) through dimension analysis , factors that affect the flow deceleration through frames are discussed . based on flume experiments , this study indicates the velocity near the bed decreases as the l / h increases , and the l / h decreases , the influence of frames height on the effect of velocity near the bed is not distinct ( 4 ) by 2 - d mathematical model , patterns of flow through frames are analyzed and the influence of different frame formations on the protection zone is researched , mean velocity in vertical decreases and protection zone enlarges as the l / h , b / b and a / h increases
( 3 )通过因次分析，探讨了四面体框架群减速率的影响因素，并进行了系列水槽试验，得出：近底流速的减速率随框架群相对长度l h的增加而增加，随框架群相对间隔距离l h的增加而减小；框架群高度对近底流速的减速率影响不大，框架群高度的增加主要表现为减速区的增高。