燃烧室释热分布对宽速域 RBCC 性能影响规律研究及释热预测模型构建

To achieve stability and efficiency in the wide-speed-range operation of rocket based combined cycle (RBCC) engines,one-dimensional analysis was used to study the influence of combustion chamber heat release distribution on RBCC engine performance under wide range conditions. The results indicate that the formation of a concentrated heat release distribution in the combustor is beneficial for improving the performance of RBCC engines,but the shortest heat release interval length is constrained by the anti backpressure ability of the inlet,and the allowable heat release interval length is shorter when the inflow velocity is higher. The numerical simulation results were verified through ground experiments,and the relationship between the inflow conditions,engine configuration,and the distribution of heat release rate in the numerical simulation was established using Rayleigh probability density function and power function.The correlation coefficients between the predicted curves within the validation set and the original data are all above 0.9,which can be used for rapid prediction of RBCC engine performance.