Three-dimensional large eddy simulation of strut flame-holder with cavity

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-averaged 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 boundary 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.