Investigation of the Radiative Heat Transfer of An Axisymmetric Nozzle Based on Null-collision Monte Carlo Method

Accurate simulation of radiative heat transfer inside the nozzle can help extend the nozzle's lifetime and optimize the design of thermal protection structures. Hence, this article employs the null-collision reverse Monte Carlo method (NC-RMC) to establish the radiative heat transfer model for a typical cylindrical nozzle, where line-by-line (LBL) calculations combined with K-distribution method and Mie scattering theory are utilized respectively to analyze gaseous and particulate radiative properties. A fast localization algorithm in axisymmetric unstructured mesh is also developed to trace the energy bundles. The above models have been validated by several tests and then executed to investigate the effects of particulate scattering on the distribution of negative radiative source terms. The results show that with the increase of the particulate diameter, the negative radiative source terms on the centerline decrease, and the particulate scattering effects almost remain constant when the particulate diameter is smaller than 1.0 micrometer.