【摘要】 当台阶均一的台阶式溢流坝在跌落水流流态时,台阶面上的脉动压力主要由跌落水舌影响,台阶水平面上压强均大于竖直面。由于水舌掺气,时均负压主要集中在台阶竖直面自台阶凸角至台阶凹角3 4的台阶高度范围内;受到跌落水舌在台阶水平面上的冲击,时均正压则主要集中在台阶水平面凸角水舌跌落处附近。台阶竖直面上的脉动压强强度远小于台阶水平面,而台阶水平面上的脉动压强强度则集中于水舌跌落处。更多还原

【Abstract】 When stepped over flow dam with uniformity step style at napple flow regime, the fluctuation pressure on step face mainly effected by flow jet. As a result of air entrain in flow jet, mean subatmospheric pressure mainly distribute in the upright step face within the range of 0.75 times step height from salient to nook of step and as a result of flow jet strike against level step face, mean positive pressure mainly focus about the place where flow nappled. The fluctuation pressure intensity in upright step face less than in level step face which mostly concentrate in the vicinity of napple flow.更多还原