跌扩型底流消能工特征流速影响因素试验研究

摘要

Based on the method of hydraulic test,the influence of depth of the falling-sill,expansion ratio and the flow Froude number on the char-acteristic velocity of the falling-sill and expanding bottom-flow energy dissipater was analyzed emphatically. The research results show that choosing the appropriate depth of falling-sill,expansion ratio and the flow Froude number can effectively decrease the maximum underflow speed and the maximum near-sidewall speed. Under the optimum condition,they can keep the maximum speed of the baseplate and sidewall lower to avoid the e-rosion and cavitation of the baseplate and sidewall.%通过水力学模型试验，着重分析了跌坎深度、突扩比和弗劳德数对跌扩型底流消能工的最大临底流速和最大临边墙流速的影响。结果表明：在跌扩型底流消能工中，选择合适的跌坎深度、突扩比和入池水流弗劳德数能有效降低消力池内最大临底流速和最大临边墙流速，在一定的最优组合下，可满足消力池底板和边墙处最大流速较小的要求，避免底板和边墙的冲磨破坏和空蚀破坏。