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通过物理模型试验,对45°弯段明渠剪切分层流的稳定性进行研究,同时进行了直道和45°弯段两种水槽的分层流试验,获得不同工况下的断面流速、温度、紊动动能、雷诺应力等物理量.选用初始密度弗汝德数作为稳定性判数,对直道和45°弯段水槽的分层流稳定性进行了分析,得出试验条件下两种水槽的稳定性判别标准并进行对比.结果表明,45°弯段分层流稳定分层的临界初始密度弗汝德数值约为直道分层流的0 7倍,说明弯段的存在加剧了分层流的垂向掺混.
Through the physical model test, the stability of stratified flow in open channel of 45 ° bent section was studied, and the stratified flow experiment of straight flume and 45 ° bent section was carried out. The flow velocity, temperature , Kinetic energy of turbulence, Reynolds stress, etc. Using the initial density Froude number as the stability criterion, the stratified flow stability of the straight channel and 45 ° bent section flume is analyzed, and the experimental results show that the two flumes The results show that the critical initial density of the stratospheric stratified flow Furet at 45 ° bend is about 0.7 times that of the straight stratified flow, which indicates that the existence of the bent section aggravates the stratified flow Vertical blending.