Accession Number : ADA435725


Title :   A Monte Carlo Radiation Model for Simulating Rarefied Multiphase Plume Flows


Descriptive Note : Technical rept.


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA


Personal Author(s) : Burt, Jonathan ; Boyd, Iain


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a435725.pdf


Report Date : May 2005


Pagination or Media Count : 15


Abstract : A Monte Carlo ray trace radiation model is presented for the determination of radiative properties of Al2O3 particles in the high altitude plume of a solid propellant rocket. A polydisperse distribution of non-gray particles is modeled as an emitting, absorbing and scattering medium of arbitrary optical thickness. Strong two-way coupling is allowed between radiation and flowfield calculations, where the gas is simulated using the direct simulation Monte Carlo method and particle phase properties are determined using a similar Lagrangian approach. Effects of anisotropic scattering and nozzle searchlight emission are considered, and a procedure is described for the calculation of spectral radiance. The model is applied to the simulation and radiation analysis of the freely expanding plume from a subscale solid rocket motor, and various flowfield properties are presented and discussed.


Descriptors :   *MODELS , *MONTE CARLO METHOD , *ANISOTROPY , *MULTIPHASE FLOW , *RAREFIED GASES , EMISSION , OPTICAL PROPERTIES , COMPUTATIONS , COMBUSTION , SPECTRA , EXHAUST PLUMES , SOLID PROPELLANT ROCKET ENGINES , LAGRANGIAN FUNCTIONS


Subject Categories : Statistics and Probability
      Fluid Mechanics
      Solid Propellant Rocket Engines


Distribution Statement : APPROVED FOR PUBLIC RELEASE