8th Thermal and Fluids Engineering Conference (TFEC)
NUMERICAL STUDY OF THE COMPLETE OPERATING MAP OF EJECTORS IN ULTRA HIGH BYPASS RATIO ENGINE BLEED SYSTEMS
New bleed systems are needed for the aircraft based on Ultra High Bypass Ratio (UHBR) engines to improve its overall efficiency, and one of the solutions is to utilize air ejectors to optimize the bleed air system. The present numerical study investigates the behavior of the ejector via entrainment ratio, limiting pressure ratios, and the performance dependency on different operating regimes. Within each regime, the ejector's performance depends on the operating conditions, such as total pressures and temperatures given at inlets and outlets. To explore the whole operating map at a fixed temperature ratio, the numerical simulations are classified according to the primary flow and the secondary flow. Combining these two classifications allows us completely to characterize the flow in the ejector. Furthermore, variation in the inlet temperatures show a prominent effect on the mass flow rates and entrainment ratio.