Numerical simulation of the infrared characteristic of missile exhaust plume

Considering the computational accuracy and efficiency synthetically, a Source Six Flux method (SSF),which is based on the traditional flux model, was proposed to solve the infrared characteristic of missile exhaust plume. The directional radiative intensity in the cylindrical media was solved by the presented SSF method, Backward Monte Carlo method (BMC), and Two Flux method (TFM), respectively. Compared with the results of the BMC and TFM, the SSF method was proved to be suitable to solve the directional infrared spectral radiative intensity in cylindrical media accurately.Meanwhile, under the condition of knowing the temperature field distribution, radiative property of the particles and gas species in the missile exhaust plume, the SSF, BMC and TFM were used to simulate the infrared spectral radiation intensity of the missile exhaust plume at different altitudes, respectively. The results show that there exists obvious peak intensities at the spectral band of 2.7 and 4.3 μm (the corresponding wave number is 3 704 cm^-1 and 2 326 cm^-1) in the infrared spectral range from 2 to 5 μm.At the same time, all the results of SSF method agree well with that of BMC method, which also indicate the accuracy of the presented SSF model.