Research on performance of multi-nozzle ejector for aeroengine air system

The aeroengine air system can be improved to more effectively cool the hot component by using the ejector to suction external atmosphere into it. The multi-nozzle ejector, compared to the single-nozzle ejector, can both reduce the length of the mixing chamber and enhance entrainment performance. In this study, numerical simulation is used to examine the impact of structural and flow parameters on the performance of a multi-nozzle ejector for an air system in the aeroengine. The findings indicate that four is the ideal number of nozzles for the multi-nozzle ejector in this research. When the expansion ratio is 2, four-nozzle ejector has the best entrainment ratio and is 34% better than single-nozzle ejector. The entrainment ratio increases by 69.7% when the ratio of the mixing chamber diameter to the nozzle inlet diameter varies from 5 to 9. When the temperature ratio is 1.5, the expansion ratio increases from 2 to 6, and the entrainment ratio decreases by 32.9%. When the expansion ratio is 3.7, the compression ratio rises from 0.7 to 1.02 and the entrainment ratio falls by 81.8%.