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›› 2007, Vol. 7 ›› Issue (5): 865-870.

• 流动与传递 • 上一篇    下一篇

射流混合器内气体湍流扩散过程的CFD数值模拟与实验研究

陈翼,张林进,叶旭初   

  1. 南京工业大学CFD技术工程模拟研究中心
  • 出版日期:2007-10-20 发布日期:2007-10-20

CFD Analysis and Experimentation on Gas Turbulent Mixing Process in a Jet Mixer

CHEN Yi,ZHANG Lin-jin,YE Xu-chu   

  1. CFD research centre of engineering simulation, Nanjing University of Technology
  • Online:2007-10-20 Published:2007-10-20

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被引次数

48

摘要： 利用计算流体动力学CFD(Computational Fluid Dynamics)商业软件CFX4.4对二氧化碳与空气的射流混合过程进行数值模拟. 湍流模型采用标准k-e模型和RNG模型，模拟预测不同断面上的CO2浓度分布，并与实验结果进行比较. 结果表明，模拟预测值与实验结果基本吻合，也验证了CFD技术应用于混合扩散过程预测分析的可靠性；靠近空气一侧的CO2浓度普遍高于另一侧，当CO2平均浓度为6%时，距射流出口100 mm剖面上的浓度极差达到6%. 本研究中的气体混合湍流模型影响不明显. 采用标准k-e模型分别对两种进气方式的射流混合器内部速度场、浓度场进行模拟分析，发现T型射流混合器的混合均匀性比单边进气的射流混合器明显提高.

关键词: 计算流体动力学, 射流混合, 湍流模型, 扩散

Abstract: The carbon dioxide-air jet mixing process is simulated with commercial CFD software. The simulated concentrations of CO2 in different section planes with the standard k-e model and the RNG turbulent model are compared with experimental data. The results indicate that the numerical results agree well with the experiments, CFD simulation is reliable in predicting the turbulent diffusing process, the CO2 concentration by the side of the lateral-inlet is generally higher than the other side, and the concentration range in the first section plane (d=100 mm) reaches 6%, while the CO2 average concentration is 6%. The influence of turbulent model on CFD simulation is not significant in gas jet mixing process. The velocity field and concentration field of a T-type symmetrical jet mixer and the original single-lateral-inlet jet mixer are then simulated with the standard k-e model, showing that the uniformity of the T-type symmetrical jet mixer is much improved as compared with the original single-lateral-inlet jet mixer.

Key words: computational fluid dynamics, jet mixing, turbulent model, diffusion