CFD MODELING OF SINGLE-PHASE SUPERSONIC EJECTORS

This work evaluates commonly used approximations in CFD studies of supersonic ejectors. Numerical results are compared with experimental data on mass flow rates and pressure profiles in order to assess the validity of the usual “hydrodynamically smooth and adiabatic” surfaces assumption. It will be shown that many custom approximations in ejector research must be reconsidered if an adequate level of accuracy is to be found. In particular, the impact of friction losses and heat transfer at wall appears to be determinant for the accuracy of ejector results at off-design conditions.