A Correlated-k Plume Radiative Transfer Code

Accurate modeling of radiation from rocket plumes is critical for remote sensing simulations and assessing vehicle base heating. Current computer models use approximate radiative transfer and computational methods that were developed 20-30 years ago. A unified, general, and accurate approach for rocket plume radiation is needed that takes advantage of rapid advances in computer speed and parallel processing and in radiative transfer modeling. Spectral Sciences, Inc. proposes to develop a new code for plume radiation using recently developed techniques implemented in state-of-the-art atmospheric radiation models. The objectives are to handle the IR through UV spectrum, altutides from ground to space, two-phase and scattering effects, LTE and non-LTE conditions, and 3D geometries. The code will use an innovative Correlated-k approach for treating molecular absorption. Advantages include the ability to handle large temperature and pressure gradients and adherence to Beer's law for proper treatment of scattering. Phase I will demonstrate this approach in the IR wavelength region for 3D gaseous plumes. In Phase II the method will be extended to the UV-visible region, the scattering algorithm will be fully implemented, user and flowfield interfaces will be developed, and the code will be delivered.