Abstract:

Turbulent combustion deals with micro-scale coupling of chemical reaction and turbulent flow. The validity of turbulence models used in flow simulation determines the success and accuracy of combustion simulation. In the present work，five variants of k-ε and k-ω family models and Reynolds stress model（RSM）were used to simulate the cool flow field（without combustion）in a bluff-body burner and PIV measurement was conducted to validate the simulation results. Comparison of numerical results with the PIV measurements showed that the simulations based on different turbulence models deviated much from each other for velocity distribution and eddy structure. Numerical results based on the standard k-ε and RNG k-ε models were in good agreement with the PIV data.

摘要：

湍流燃烧过程涉及燃烧反应和湍流在微小时间和空间尺度上的耦合，因此湍流模型的有效性对燃烧器流场CFD模拟的准确性有重要影响。采用5种k-ε类和k-ω类两方程模型和雷诺应力模型模拟了钝体燃烧器内冷流流场，并采用PIV测量方法进行了实验验证。比较和分析数值模拟和PIV实验结果发现，不同湍流模型的模拟结果在诸如速度分布和涡结构上存在较大差别，标准k-ε模型和RNG k-ε的模拟流场最接近本文的实验结果。