Simulation of the Infrared Emission from Nonscattering Aircraft Engine Exhaust Plumes Using Statistical Narrowband Models in Conjunction with Model Parameters Based on the Modern Spectroscopic Data

摘要

Infrared (IR) emission properties of nonscattering exhaust plumes of realistic aircraft engines are studied and analyzed in this paper by means of numerical simulations applying statistical narrowband (SNB) models. A review of the model parameters generated by various authors is given. Different factors affecting the plume IR signature simulation such as the parameters fitting, applications of various band models, and the accuracy of the temperature grid used to generate the model parameters are discussed. Comparative calculations are performed applying the various data sets of the band model parameters in order to find out their effect on the plume IR emission prediction. It is shown that the total plume intensity is significantly underestimated by application of the old parameters when compared with those generated from the modern spectroscopic data. The effect of lobed flow mixer of a turbofan engine on the plume IR signature is studied. When compared with the annular flow mixer, the lobed mixer provides the IR emission reduction by 80% for the conditions investigated.