摘要
为了快速准确地预测不同工况下燃烧室流场信息,构建了含有几何特征的化学反应器网络对燃烧室进行高精度预测模拟.根据CFD数值模拟结果对燃烧室进行分区,建立特征网络,每个区域由不同的反应器进行模拟.采用这种方法对滞止点回流(SPRF)燃烧室进行网络拓扑构建,着重利用试验数据对反应器网络的特征尺寸进行优化.对构建的燃烧反应器网络结构优化后进行CRN模拟计算,其结果与试验数据相差不大.最后考虑了回流作用对拓扑结构的影响.研究结果表明,优化的CRN是合理的,在当量比范围为0.8～1.0时其反应器网络拓扑结构具有较强的适用性.相较于没有回流的拓扑结构,考虑了回流作用的拓扑结构能够更准确地预测燃烧室的流场信息.随着当量比增大,NO_x的排放量随之增大;随着进口温度的增大,NO_x排放也随之增大.此外这种方法相较于CFD极大地缩短了计算时间.
To rapidly and accurately predict the information of flow field in a combustor,a chemical reactor network(CRN)containing geometric characteristics was established.The combustor was divided according to the numerical simulation result obtained using computational fluid dynamics(CFD). A characteristic network was built,in which each region was simulated by different reactors.This approach was applied to build a topological network for the stagnation point reverse flow combustor.Experimental data were used to optimize the characteristic dimensions of CRN.Simulations and calculations were then performed based on CRN,showing that the simulation results were in good agreement with the experimental data.Finally,the influence of backflow effect on the topological structure was considered.Research results indicate that the optimized CRN was reasonable,and its topological structure had strong capability when the equivalence ratio ranged from 0.8 to 1.0. Comparatively,the topological structure with the consideration of backflow effect could predict the information of flow field in the combustor more accurately than that without.With the increase in equivalence ratio,NO_x emissions increased.With the increase in inlet temperature,NO_x emissions increased as well.Furthermore,the proposed method could greatly reduce the computation time compared with CFD.
作者
赵璐
刘勇
张祥
李亚清
Zhao Lu;Liu Yong;Zhang Xiang;Li Yaqing(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics, Nanjing 210016,China;Aero-Engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2019年第3期251-259,共9页
Journal of Combustion Science and Technology
关键词
化学反应器
拓扑结构
回流
优化
SPRF
燃烧室
chemical reactor
topological structure
backflow
optimization
stagnation point reverse flow combustor
