水平多股淹没射流水力特性及消能分析

针对不能采用挑流消能型式的大型水电工程,提出了多股多层水平淹没射流新型消能型式.它是利用与下游消力池底板具有一定高差且基本平行的多股射流进入消能水体的中间,在每一股射流的四周形成强剪切并各有一个较为稳定的三元紊动旋滚的水平多股淹没射流进行消能.对该消能方式的水力特性和消能特性进行理论分析,推导出三元水平多股淹没射流水力参数计算公式,计算结果表明它是一种流态稳定、适应性强、低雾化、高消能率,有利于降低临底流速的新型消能方式.

Energy dissipation and hydraulics characteristics of multi-horizontal submerged jets

In this paper, the multi-horizontal submerged jets (MHSJ), a good design of energy dissipation, is presented. The MHSJ comes into being by the special ways with horizontal and parallel jets and a needed distance to the bottom of bed when jets enter into the still downstream basin. In this arrangement, the number of strong stress and the turbulence among water surface, the high speed flow and the bottom of basin are twice more than enlarge or shorten jump. Therefore, the MHSJ is a kind of efficient energy dissipation in the term of making use of the strong stress and the 3-D turbulence vortexes. The hydraulic characteristics and dissipated energy ratio are studied theoretically, and the formula to calculate the conjugate water depth and energy dissipated ratio are obtained. These results show that the MSBJ is a good dissipation energy type with less local precipitation, more dissipated energy rate, well applicability, and wide practicability.