Numerical modeling and experimental analysis of air ejectors’ transient operation in bleed-air aircraft systems
(2025) Energy — Vol. 340, p. 139136 (2025)
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- Authors
Schillaci, Eugenio 
Oliet, Carles Vemula, Jagadish Babu Planquart, Philippe
- Abstract
- The physics and modeling of air ejectors in on- and off-design conditions have been extensively addressed in the past, reaching a good level of maturity. However, to achieve a robust dynamic model at the system scale integrating an ejector, there is a need to develop 0D models suitable for tackling abnormal functioning modes and the transition between them. The current research focuses on understanding the physical behavior of air ejectors for aeronautical applications. First, the operational envelope with relevant modes and transitions is presented. Hence, an experimental set-up is built to allow direct observation of transient phenomena under typical aeronautical conditions. Complementarily, CFD (RANS and URANS) simulations are employed to gain knowledge of the whole operational envelope, including abnormal modes. Experimental analysis and CFD are employed to show the ejector’s quasi-steady behavior under the system’s time-scale. As a final milestone, a 0D model previously implemented is here extended and calibrated using CFD simulations to cover abnormal functioning scenarios as primary closed mode and inverted operation. Finally, some typical transitions belonging to the operational envelope are reproduced and validated compared to experimental data, and the robustness of the Modelica implementation is highlighted.
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Citations
Schillaci, E., Oliet, C., Vemula, J. B., Duponcheel, M., Bartosiewicz, Y., & Planquart, P. (2025). Numerical modeling and experimental analysis of air ejectors’ transient operation in bleed-air aircraft systems. Energy, 340, 139136. https://doi.org/10.1016/j.energy.2025.139136 (Original work published 2025)