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采用混合物模型和RNGκ-ε紊流模型对气液两相绕流错列圆柱管束升力特性进行了数值模拟。重点研究了节距比、含气率和雷诺数对升力功率谱的影响。结果表明:节距比增大,功率谱峰值增加,节距比为1.5时中间管排出现“双稳态现象”;含气率增加,功率谱峰值减小直至没有峰值,涡街消失;雷诺数增加,功率谱峰值减小;下游圆柱功率谱峰值较中间管排峰值大。模拟结果与实验结果基本吻合,旋涡脱落频率误差为1.03%。
The mixture model and RNGκ-ε turbulence model were used to simulate the lift characteristics of gas-liquid two-phase flow-staggered cylindrical tube bundles. Focus on the pitch ratio, gas content and Reynolds number of lift power spectrum. The results show that the pitch ratio increases, the power spectrum peak increases, and the middle tube row appears “bistable phenomenon” when the pitch ratio is 1.5; the gas content increases, the peak of power spectrum decreases until there is no peak, vortex disappears ; The Reynolds number increases, the power spectrum peak decreases; the peak value of the downstream cylindrical power spectrum is larger than that of the middle tube. The simulation results basically agree with the experimental results, and the error of shedding frequency is 1.03%.