A systematic evaluation of several turbulence models for use in aircraft and rocket plume flowfield predictions is presented. Eddy viscosity and two equation (TKE) models presently utilized for plume calculations have been incorporated into a mixing/afterburning code (BOAT) and tested against a wide range of laboratory data. These data include incompressible and compressible free shear layers and jets, H2/air subsonic and subsonic reacting flows and a liquid propellant rocket plume. The significant differences between rocket/aircraft plume flowfields and the laboratory test conditions used to determine the turbulence model 'constants' are discussed. The two-equation (K 2) model, with a suitable correction for compressibility, adequately predicts all the nonreacting shear layer and jet cases and the subsonic H2/air reacting jet case, but does not fare as well in the supersonic H2/air reacting jet and liquid propellant plume cases. Suggestions are given for K 2 model improvements to account for the noted inadequacies in compressible, reacting flows, and a recommended method for implementing these model improvements is provided. (Author)
Evaluation of Turbulence Models for Rocket and Aircraft Plume Flowfield Predictions. Volume I
1979
47 pages
Report
No indication
English
Aircraft , Rocket Engines & Motors , Combustion & Ignition , Turbulent flow , Exhaust plumes , Flow fields , Mathematical models , Mathematical prediction , Jet mixing flow , Incompressible flow , Compressible flow , Shear properties , Aircraft engines , Liquid propellant rocket engines , Afterburning , Jet flow , Differential equations