Numerical Simulation of Gas Mixing in Cross-flow
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摘要: 采用显式的TVD MacCormack格式的时间分裂形式求解了平板上横流流场的二维N-S方程和组分输运方程,得到了流场中气体超音速流动和混合的结构图谱.为了获得对近壁附面层分离较好的模拟效果,采用了Lam和Bremhorst的低雷诺数ｋ-ε模型来模拟流动中的湍流粘性.计算结果表明,该方法可以用来求解横流流场中的气流掺混问题.Abstract: A time-split explicit TVD MacCormack algorithm is used to solve the two-dimensional N-S equations coupled with species diffusion equations.Both molecular and turbulent properties of viscosity,thermal conductivity and mass conductivity are calculated.In order to deal with the near wall separation of boundary layer,the low Reynolds number ｋ-ε turbulence model of Lam and Bremhorst is used in this procedure.A sample of plane cross-flow is used to test the reliability and accuracy of this method and the results show that this scheme can be applied to solve the problem of supersonic flow fields with gas mixing,the solutions are satisfactory.
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Key words:
- computation fluid mechanics /
- numerical simulation /
- turbulent mixing /
- cross flow
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1. Grasso F,Magi V.Simulation of gas transverse injection in turbulent supersonic air flows.AIAA Paper 93-2925,1993 2. Robert C B,The properties of gases and liquids.New York:McGraw-Hill Book Company,1977.411,508,549 3. Sanford G,Bonnie J M.Computer programs for calculation of complex chemical equilibrium compositions,rocket performance,incident and reflected shocks and chapmanjouguet detonation NASA-SP-273,1971 4. Lam C K G,Bremhorst K A.Modified form of the ｋ-ε model for predicting wall turbulence.Journal of Fluids Engineering,1981,103:456~460 5.徐旭,张振鹏.用TVD方法模拟喷管内的横流流动.推进技术,1997,18(5):53~56 -
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