Implementation of the P1 Radiation Model in the CFD solver NSMB and Investigation of Radiative Heat Transfer in the SSME Main Combustion Chamber

Abstract

In this paper the implementation of the P1 Radiation Model in the CFD code NSMB, its validation and its application in the CFD analysis of the SSME Main Combustion Chamber is presented. The P1 Radiation Model is implemented in NSMB with a pseudo-transientapproach. Its validation on several one- and two-dimensional cases as well as in gray and non-gray media shows good accuracy and is an improvement over the former radiative transport model in NSMB, the Rosseland Radiation Model. In the radiative analysis of the LH2/LOX combustion in the SSME Main Combustion Chamber, results of both uncoupled and coupled CFD simulations are compared to benchmark results. A simple gray gas assumption and the Weighted Sum of Gray Gases Model (WSGGM) are used for spectral integration. Results of the CFD simulation show that in the uncoupled case the P1 Model in conjunction with either the gray gas approximation or the WSGGM underpredict the Radiative Wall Heat Flux (RWHF) of the benchmarks. In the coupled simulation, the P1 Model and a gray gas approximation come closer to the benchmark results but slightly overestimate them.