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水电站引水渠道中的冰害会影响水电站的安全运行,危害当地人民的人身安全,因此,输排冰运行方式的成败便成为引水式水电站冬季安全运行的关键所在。建立了三维非稳态欧拉两相流模型,在水流流动过程冰的动量源项中考虑了相间曳力、升力、虚拟质量力的作用,以及密度差的影响。模拟分析了不同转弯半径对弯道排冰的影响,结果表明:转弯半径为200m时弯道内的水流平缓,流速分布较均匀,排冰闸前的浮冰量最大,排冰量最大,冰水比相对较大,排冰效果最好。可知,转弯半径200m时为最佳布置形式,从而实现了对弯道输排冰的布置形式进行合理的优化设计,以达到顺利输排冰,保证冬季安全运行的目的。通过与Blanckaert所做的弯道冲淤试验水槽实验结果对比,验证了模型的可靠性。
Ice damage in diversion channels of hydropower stations will affect the safe operation of hydropower stations and endanger the personal safety of local people. Therefore, the success or failure of the mode of operation of ice discharge and discharge will become the key to winter-safe operation of water diversion hydropower stations. A three-dimensional unsteady Euler two-phase flow model is established. The influence of interphase drag force, lift force and virtual mass force, as well as density difference, are considered in the momentum source term of ice flow. The results show that when the turning radius is 200m, the water flow in the curve is smooth and the flow velocity distribution is more uniform. The ice floe volume before the ice flooding gate is the largest and the ice discharge amount is the largest Relatively large, the best ice discharge. It can be seen that the best arrangement form is when the turning radius is 200m, so that the rational optimization design of the layout of the ice discharge in the curve is achieved, so as to achieve the purpose of smoothly transporting ice and ensuring the winter safe operation. The reliability of the model is verified by comparing with the experimental results of Blanckaert curve test.