Approaches for Comparing Numerical Simulation of Combustion Instability and Flame Imaging

作者：Hardi Justin S^*; Hallum W Zach; Huang Cheng; Anderson William E

来源：Journal of Propulsion and Power, 2016, 32(2): 279-294.

DOI：10.2514/1.B35780

Combustion dynamics are controlled by the coupling between heat addition and gas dynamic modes, and their direct measurement and comparisons with prediction are key to improving computational tools, as well as our fundamental understanding of the problem. This paper demonstrates several methods for characterizing and comparing dynamic combustion response from experiment and simulation. A model rocket combustor that exhibits self-excited instabilities is used for the study. Comparisons are made for two configurations: one stable and one unstable. High-speed chemiluminescence imaging from the experiment was first phase averaged, then treated with an Abel inversion routine to produce a dynamic two-dimensional distribution of heat addition. The distribution before inversion could be compared with line-integrated calculations of the heat release rate from three-dimensional large-eddy simulations, and after inversion to azimuthally averaged cross sections from simulations. Modal decomposition of the two-dimensional distributions was performed and compared. The applicability and limitations of each comparison approach are assessed.

• 出版日期2016-3