Abstract
An improved model of the aircraft plume is proposed to analyze the effects of alumina particle clusters on ultraviolet (UV) radiation signature. In the simulation, the scattering effect of particle clusters rather than individual particles on the radiation characteristics in the plume is considered. The modified diffusion-limited aggregation (DLA) method is used to generate the geometry of the cluster example and the scattering characteristics of the particle clusters are calculated by multi-sphere T-matrix method (MSTM) at first. Then the average optical properties of the particle clusters are calculated and applied to improved spherical harmonic discrete ordinate method (SHDOM), together with a new source term about the chemiluminescence emission in the plume, the improved radiation model is constructed carefully. The simulation results show that at a small observation angle, alumina particle clusters can significantly enhance the radiance of the plume comparing to the individual particle model. Meanwhile, the radiance distribution of a more realistic three-dimensional(3-D) plume is presented when both the radial and axial property variation of a whole plume structure are concerned in this model.
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