全环燃烧室出口温度场特征参数概率分布研究

A comprehensive statistical analysis was employed to evaluate the influences of key parameters on outlet temperature distribution factor (OTDF) and radial temperature distribution factor (RTDF) in multiple sets of aero-engine combustors. Six parameters of combustor included flow number (FN) of aero-engine fuel nozzle, the axial installation position of fuel injectors, the diameters of primary holes and dilution holes on the liner. Utilizing the probability density distribution functions (PDFs) of these six dimensionless parameters，an equal area spacing method was applied for sampling of these parameters as inputs into a developed low-order prediction model for the full-annular combustor outlet temperature distribution. The prediction model facilitated rapid calculations under varying parameter conditions and yielded the probability density distributions of OTDF and RTDF. Within the 95% confidence interval，the values of OTDF and RTDF respectively did not exceed 1.044 and 1.169 times of their large-sample means. Further analysis on the dispersion of OTDF and RTDF within a unified benchmark range of 0.9 to 1.1 relative to the statistical means of these six parameters in the multiple sets of engines was conducted，revealing the diameter of the dilution holes on the liner as a highly sensitive parameter affecting the dispersion of combustor outlet temperature distribution performance.