Generalized Multi-Flux Method For Simulating Directional Radiative Transfer In Participating Media

Over the last few decades, the problem of detecting directional radiative intensity signals has received considerable attention due to their numerous applications in the field of target detection, optical tomography, combustion diagnosis, temperature measurement of flame, and atmosphere remote sensing etc. Meanwhile, there appears to be a number of high temperature, multidimensional, nonhomogeneous, anisotropic scattering radiation problems in the field of infrared radiation transfer, which offers more require for the computation of radiation characteristics and transfer. Considering detecting problem at certain direction in engineering problems, a simple and efficient numerical model is presented in the present paper, which is suitable for solving directional radiative problems in the engineering applications.For having the advantages such as freedom of selection of control angle, guarantee of conservation of radiant energy, the results of Finite Volume Method(FVM) is very accurate. In the present paper, based on original discrete ordinate and direction of FVM, a multi-flux method (MFM) has been proposed to solve the radiation intensity in arbitrary direction with high accuracy and low time-consuming, which agree well with that of BMC. This dissertation includes the following contents:1. Based on FVM, a generalized Multi-Flux Method (MFM) model is presented. A 3-D validation model in participating media is solved by MFM, Backward MC (BMC), Sourced Six-Flux Method (SSF) respectively,and the result shows MFM is feasible and suitable to the practical engineering applications with high accuracy and low time-consuming.2. The entire exhaust plume as the computing domain was placed in a cylinder. The flow field having been known, with the help of Mie Scattering theory and the line-by-line (LBL) integration algorithms, MFM was used to simulated spectral radiation intensity with arbitrary direction of exhaust plume with different height. Finally, variable rule is analyzed between the result, height and wavenumber.