超高水头竖井旋流泄洪洞不同湍流模型数值模拟

发布时间：2018-03-17 10:19

本文选题：竖井旋流　切入点：数值模拟　出处：《人民长江》2017年03期 　论文类型：期刊论文

【摘要】：基于VOF法,分别选取标准k-ε紊流模型、RNG k-ε紊流模型和Realizable k-ε紊流模型,对某一超高水头、大泄量竖井旋流泄洪洞的水力特性进行数值模拟,并将紊流模型计算结果与模型实验数据进行了对比分析。结果表明:3种紊流模型模拟计算所得的空腔直径、竖井壁面压强、旋流角等参数变化趋势与模型试验测试结果基本相同,但量值有所差别。相比较而言,Realizable k-ε紊流模型计算所得旋转水流的空腔直径、压坡底板与部分竖井壁面压强、旋流角在量值上更接近试验测量值。因此,Realizable k-ε紊流模型能够更好地模拟这种具有超高水头、大泄量、强旋转并带有自由液面旋转水流的水力特性。
[Abstract]:Based on the VOF method, the standard k- 蔚 turbulence model and the Realizable k- 蔚 turbulence model are selected, respectively, to simulate the hydraulic characteristics of a high water head and large discharge shaft swirling flood discharge tunnel. The calculated results of the turbulent model are compared with the experimental data of the model. The results show that the cavity diameter and the wall pressure of the shaft are calculated by the simulation of the three kinds of turbulence models. The variation trend of swirl angle and other parameters is basically the same as that of the model test, but the values are different. Compared with the realizable k- 蔚 turbulence model, the cavity diameter of the rotating flow, the pressure on the bottom plate of the slope and the wall pressure of some vertical wells are calculated by using the realizable k- 蔚 turbulence model. The swirl angle is closer to the measured value, so the realizable k- 蔚 turbulence model can better simulate the hydraulic characteristics of the flow with super high head, large discharge, strong rotation and free surface rotation.
【作者单位】：西北农林科技大学水利与建筑工程学院;
【分类号】：TV135.2

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