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旨在用数值模拟方法推求计算梯型薄壁堰堰流的简化公式。通过推求梯型薄壁堰堰流的基本理论公式,并求解气液两相流时均方程,辅以RNG k-ε湍流模型模拟了5种不同堰顶水头下梯形薄壁堰的过流能力。用SIMPLE算法对模拟体系中的压力与速度的耦合进行求解,同时用VOF法对自由水面的流动变化信息进行捕捉;进而通过最小二乘法的拟合得到模拟的流量值随堰顶水头变化的简化计算式,采用此公式计算了梯形薄壁堰在不同堰顶水头时的过流流量,与所推基本理论公式的计算值相比结果基本一致,可为实际工程中流量的控制和测量提供参考。
The purpose of this paper is to deduce a simplified formula for calculating the weir flow of ladder-type thin weir with numerical simulation method. The over-current capability of five different weir head trapezoidal thin-walled weirs was simulated by deducing the basic theoretical formula of the stepped thin weir weir flow and solving the mean-time equation of gas-liquid two-phase flow and RNG k-ε turbulence model . The SIMPLE algorithm was used to solve the coupling of pressure and velocity in the simulation system. At the same time, the VOF method was used to capture the information of the free-flow change. Then the simulated flow rate was simplified with the change of the top of the weir by means of least- The formula was used to calculate the overflow flow rate of the trapezoidal thin-walled weir at the different head of weir, which is basically consistent with the calculated value of the basic theoretical formula, which can be used as a reference for the control and measurement of the flow in practical engineering .