北京航空航天大学学报 ›› 1999, Vol. 25 ›› Issue (4): 442-446.

• 论文 • 上一篇    下一篇

条件矩封闭模型应用于非预混湍流反应流动

刘涛1, 刘刚1, 方韧1, 许康烈2   

  1. 1. 北京航空航天大学 动力系;
    2. 浦项工科大学机械系 韩国浦项790-784
  • 收稿日期:1998-03-20 出版日期:1999-04-30 发布日期:2010-09-28
  • 作者简介:男 40岁 副教授 100083 北京
  • 基金资助:

    国家自然科学基金(59876002)资助项目

Implementation of Elliptic-type Conditional Moment Closure Model to Nonpremixed Turbulent Reacting Flows

Liu Tao1, Liu Gang1, Fang Ren1, XU Kanglie2   

  1. 1. Beijing University of Aeronautics and Astronautics,Dept. of Jet Propulsion;
    2. Department of Mechanical Engineering Pohang University of Science & Technology Pohang 790-784, Korea
  • Received:1998-03-20 Online:1999-04-30 Published:2010-09-28

摘要: 推导了考虑分子和湍流扩散的条件矩封闭方程,并利用其模拟了二维非预混湍流反应流,计算结果与实验结果符合良好.结果表明,有限值的Damkohler数使条件平均变量偏离其平衡状态,且在混合分数η位于化学恰当比下的混合分数附近时偏离最大.Damkohler数的升高还使得条件和无条件平均的反应速率升高,并使条件平均变量向其平衡状态值趋近.本文还观察到以往的简化维数处理会引起一定的偏差.因此,对于一般的椭圆型反应流动,建议采用考虑扩散效应的CMC控制方程.

Abstract: The conditional moment closure (CMC) formulation considering both molecular and turbulent diffusions is derived and applied to simulate two dimensional nonpremixed turbulent reacting flows. Calculated results show good agreement with experimental ones. Results show that finite Damkohler number makes conditional averaged variables depart from their equilibrium values and the deviation is the maximum near stoichiometric mass fraction. The increasing Damkohler number increases conditional and unconditional mean reaction rates, and makes the conditional mean variable towards equilibrium limit.It is also shown that the reduction of dimensionality may result in certain deviations. For general elliptic-type reaction flow, it is suggested that the CMC formulation accounting for diffusion effect be employed.

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