Surface roughness and radiation effects on the erosion behavior of a graphite nozzle are studied for both metallized and nonmetallized propellants. A validated numerical approach that relies on a full Navier–Stokes flow solver coupled with a thermochemical ablation model is used for the analysis. A modification of the Spalart–Allmaras turbulence model is implemented to account for surface roughness. Net radiative heat flux is considered in the surface energy balance at the nozzle interface. Two different simplified models are used to evaluate the integral emissivity of dispersed alumina particles. Individual and combined effects of roughness and radiation are analyzed. Surface roughness enhances the erosion rate for both metallized and nonmetallized propellants noticeably. The radiation influences the erosion rate of nonmetallized propellant more than the metallized one, mainly due to the different erosion regimes, kinetically controlled for the former and diffusion controlled for the latter.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Radiation and Roughness Effects on Nozzle Thermochemical Erosion in Solid Rocket Motors


    Contributors:

    Published in:

    Publication date :

    2014-02-20


    Size :

    11 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English