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利用雷诺平均Navier-Stokes(RANS)方程和k-ω涡粘紊流模型,研究在无丁坝、直线型丁坝、T型丁坝三种工况下90°弯道水流中的水力特性.研究结果表明:与直线型丁坝相比,T型丁坝下游形成的回流区长度约缩短15%,宽度约缩窄25%;对水面壅高、横纵比降的影响程度较小,且将横向环流移向河道中心,更加合理的减轻环流对岸边的水毁破坏;河床切应力突增率低于直线型丁坝,强度顺河道向下游衰退更快.综合比较,T型丁坝是一种优于直线型丁坝的坝型.
Using the Reynolds-averaged Navier-Stokes (RANS) equation and the k-ω vortex-viscous turbulence model, the hydraulic characteristics of the 90 ° bend under no-load dam, linear groyne and T-shaped groyne were studied.The results show that : Compared with linear nappe dam, the length of recirculation zone formed downstream of T-shaped groyne dampen about 15% and the width narrows by about 25%. It has less influence on water surface height and horizontal-vertical gradient, River center, more reasonable to reduce the circulation damage to the shore of the river damage; river bed shear stress rate of increase is lower than the linear type of dam, the intensity of decline along the river to the lower recess faster.Comparison, T-shaped groyne is a better than linear Dingba dam type.