基于IDDES和VODE方法的超声速燃烧假定PDF模拟  

Simulation of Supersonic Combustion by Assumed PDF Approach Based on IDDES Model and VODE Solver

作　　者：牛健[1] 刘小勇[1] 朴英[2] 

机构地区：[1]北京动力机械研究所,北京100074 [2]清华大学航天航空学院,北京100084

出　　处：《战术导弹技术》2014年第4期43-51,62,共10页Tactical Missile Technology

摘　　要：为解决化学反应源项计算带来的刚性问题,建立了基于VODE的考虑温度脉动的假定PDF方法,使用IDDES模型对超声速化学反应混合层和超声速壁面喷射燃烧进行了混合RANS/LES模拟。结果表明,大尺度涡系结构的发展对混合和燃烧过程影响明显,湍流涡团的卷曲、拉伸、剪切和破碎能够促进混合层的发展;温度脉动加剧了燃烧区的化学反应,同时在混合不充分区域产生一定的活性基积累,说明燃烧模型能够准确反映湍流输运对化学反应的影响;预测的组分分布与试验结果一致,说明本方法能够用于超声速燃烧模拟。In order to resolve the rigidity caused by chemical source term calculation, assumed PDF ap- proach considering temperature fluctuations based on VODE solver was founded. A hybrid RANS/LES simulation of supersonic reacting mixing layer and supersonic wall jet combustion using IDDES model shows that, development of large-scale vortex structure has a significant effect on mixing and combustion. Rolling, stretching, shearing and breaking of turbulent eddy can promote the development of mixing lay- er. Temperature fluctuations intensify chemical reaction of reacting zone, while the inadequate mixing re- gion having some accumulation of active species, showing that this model can accurately reflect the im- pact between turbulent transports and chemical reactions. Predicted species distribution has a good agree- ment with experiment, indicating that this method can be used to supersonic turbulent combustion.

关 键 词：超声速燃烧 假定PDF 混合RANS/LES VODE方法 

分 类 号：V435.12[航空宇航科学与技术—航空宇航推进理论与工程]