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为分析渠系分流口区域的水流运动特性,通过观测室内模型试验水流运动现象,利用RNGκ-ε紊流模型并借助FLOW-3D软件,建立了分流角为73°的渠系分流口区域的水力特性分析计算模型。通过对比分析数值模拟结果与试验结果,验证了该分析计算模型的准确性和可靠性。以建立的数学模型为分析计算平台,分析了渠系分流口近区及口门断面不同工况下的多个水力要素,重点介绍了不同单宽流量比情况下,渠系分流口区域回流区长度与宽度及引水支渠进水断面收缩系数的变化规律。分析结果表明,随单宽流量比的增大,分流口区域回流区范围增大,支渠渠道进水断面收缩系数减小。研究成果可为类似工程规划设计提供参考。
In order to analyze the characteristics of water flow in the outlet of the canal system, by observing the phenomenon of water flow in the indoor model test, the hydraulic force of the outlet of the canal at the angle of divergence of 73 ° was established by RNG κ-ε turbulence model and FLOW-3D software Characteristic analysis and calculation model. By comparing the numerical simulation results with the experimental results, the accuracy and reliability of the analytical model are verified. Taking the established mathematical model as the analysis and calculation platform, several hydraulic factors under different working conditions of the near-mouth and mouth-opening of the canal system are analyzed. The influence of different single-wide flow rate ratio on the backflow zone Length and width of water diversion branch canal and water diversion section contraction coefficient variation law. The analysis results show that with the increase of single-wide flow rate ratio, the range of recirculation zone in the shunt area increases, and the shrinkage coefficient at the inlet section of branch canal decreases. The research results can provide reference for similar project planning and design.