体型参数对旋流排沙渠道水沙特性的影响

为明确关键体型参数对渠道和排沙洞内水沙特性的影响,在模型试验研究的基础上开展了旋流排沙渠道的水沙两相流数值模拟。结果表明:起旋室高度对截沙率影响较为显著,最大相差5.41%；排沙洞直径、倾角和起旋室出口宽度对分流比影响显著,最大相差8.13%,增大倾角后改善了原排沙洞封闭端因壁面条件影响而产生的泥沙淤积；起旋室出口宽度对渠道内水沙特性基本无影响；不同体型下旋流排沙渠道均可高效、持续排沙,截沙率均大于90%,经过起旋室后,高含沙水流从排沙洞流出,下游渠道含沙量急剧减小。

Influence of shape parameters on characteristics of water and sediment in desilting channel with swirling flow

To clarify the influence of key shape parameters on the characteristics of water and sediment in the channel and sediment transport pipe, numerical simulations of the water and sediment two-phase flow in the desilting channel with swirling flow were conducted based on the model experimental test. The results show that the height of the swirling flow generator significantly affects the sediment trapping efficiency, with a maximum difference of 5.41%. The diameter and inclination angle of the sediment transport pipe, and the outlet width of the swirling flow generator have significant influences on the split ratio, with a maximum difference of 8.13%. Increasing the inclination angle improves the sediment accumulation caused by wall conditions at the closed end of the sediment transport pipe. The outlet width of the swirling flow generator has no evident effect on the characteristics of water and sediment in the channel. The desilting channel with swirling flow can discharge sediment efficiently and continuously in all types of desilting channels, with sediment trapping efficiency greater than 90%. After passing through the swirling flow generator, the water with high sediment content flows out of the sediment transport pipe, and the sediment content in the downstream channel decreases sharply.