不同PDF模型在超燃冲压发动机数值模拟中的应用  

Application of Different PDF Models for Numerical Simulation of Scramjet

作　　者：丁海昕 钟诚文[1] Ding Haixin;Zhong Chengwen(School of Aeronautics,Northwestern Polytechnical University,Xi’an 710072,China;China Aerodynamics Research and Development Center,Mianyang 621000,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]中国空气动力研究与发展中心,绵阳621000

出　　处：《航空工程进展》2019年第5期698-706,共9页Advances in Aeronautical Science and Engineering

摘　　要：湍流与燃烧相互作用对复杂超声速燃烧流场产生影响,基于设定型PDF(Probability Density Function)模型对其不同分布模型进行研究。考虑温度和组分联合概率密度函数,采用β-PDF和δ-PDF方法对HF2直连式发动机模型进行模拟,并与该发动机风洞试验数据进行对比。结果表明:无论是定量还是定性分析,两种PDF方法的预测结果与实验结果吻合好,说明湍流与化学反应相互作用不能忽略;采用β分布的算例壁面压强分布结果与实验结果吻合更好,燃烧效率更高,更能够捕捉湍流对于化学反应的影响。Since the turbulence-combustion interaction is of great influence on complex supersonic combustion field,the different distribution of probability density function(PDF)models is studied on the basis of assumed PDF models.Considering the temperature and component fluctuations,theβ-PDF andδ-PDF methods are used to simulate the hypersonic international flight research experimentation(HF2)direct-connect engine,and compared with the actual wind tunnel experimental results.The results show that:the prediction results of two PDF models is identical with experimental results whatever quantitate or qualitative analysis,which shows that the turbulence-combustion interaction cannot be ignored;theβ-PDF model is better while predicting the wall pressure distribution,and has higher combustion efficiency,and can capture the turbulence-combustion interaction accurately.

关 键 词：超燃冲压发动机 超声速湍流燃烧 PDF模型 

分 类 号：V231.21[航空宇航科学与技术—航空宇航推进理论与工程]