Calibration of the 0D model of an air ejector by means of compressible RANS simulations

Abstract

This work analyzes the need to perform a series of CFD simulations in order to calibrate 0D ejector models. The proposed case study consists in the analysis of a supersonic air ejector used in the aeronautical field to improve the efficiency of a compressor bleeding system. Compressible RANS simulations are performed in a wide range of conditions, mimicking the operational envelope of flight conditions, and the results are compared with those of the 0D model proposed by the authors and presented in previous works. It is shown how the comparison with CFD data allows the calibration of the empirical parameters of the model, i.e. isentropic coefficients of the primary and secondary processes, and irreversibility coefficient in the mixing zone.