摘要
为研究支板冷态流场,应用LES(大涡模拟)的方法对带凹腔的支板火焰稳定器在Ma=0.06和Ma=0.09两种工况下分别进行三维数值模拟.对比试验和仿真结果表明:三维大涡模拟结果具有与试验相似的流场结构,定量对比试验和LES结果的尾涡脱落频率的最大相对误差为9.4%;支板尾部截面流向时均速度的最大相对误差为7.7%.表明数值模拟方法和边界条件设置的正确性和可信度.又对支板的三维流场进行分析:速度越大,支板尾涡的尺寸和强度越大;支板流场存在明显的三维效应,并且随着速度变大,三维效应越明显.
In order to study the cold flow field of strut, three-dimensional LES （large eddy simulation） of strut flame-holder with cavity at Ma = 0.06 and Ma = 0.09 was carried out respectively. The simulation results were compared with experiment data. It showed that the flow field structure of three-dimensional LES was similar with that of experiment. What＇s more, two quantitative comparisons in the frequency of wake vortex and time-aver- aged stream-wise velocity on strut rear section were made. And the maximum relative errors were 9.4% and 7.7% respectively, proving that the model of numerical calculation at bound- ary conditions was correct and believable. Then by analyzing the three-dimensional flow field of strut, a conclusion that the faster velocity means the bigger size and intensity of wake vortex. Besides, the result of three-dimensional LES shows an obvious phenomenon of three-dimensional effect which gets stronger when the velocity gets faster.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2017年第3期607-613,共7页
Journal of Aerospace Power
关键词
加力燃烧室
支板
凹腔
大涡模拟
尾涡
三维效应
after-burner
strut
cavity
large eddy simulation
wake vortex
three-dimensional effect
