2026-04-13T11:45:22Zhttps://recercat.cat/oai/request
oai:recercat.cat:2117/4100102026-02-07T11:00:41Zcom_2072_1033col_2072_452950
RECERCAT author Schillaci, Eugenio author Vera Gil, Jordi author Oliet Casasayas, Carles author Vemula, Jagadish Babu author Duponcheel, Matthieu author Bartosiewicz, Yann 2024-09-01 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 model at system scale integrating an ejector, there is a need for developing 0D models suitable to tackle abnormal functioning modes, such as cases where the ejector works in subsonic conditions, reverse flows, or closed ports. Based on state-of-the-art models, a new 0D model has been built in the current work, where proper subroutine implementations allow covering normal and abnormal operations of convergent nozzle ejectors. The current research also focuses on understanding the physical behavior of air ejectors for aeronautical applications. In this regard, CFD-RANS simulations are used to perform model verification and calibration as well as to gain knowledge of the whole operational envelope. The regimes reproduced by the 0D model, and validated by CFD, cover the normal operating mode with different choking regimes, the occurrence of a subsonic primary flow, and the closed secondary port case. Additional cases are run to assess other features of the ejector behavior, such as the influence of geometrical properties on the choking mechanism and the impact of thermal effects.Peer ReviewedPostprint (published version) http://creativecommons.org/licenses/by-nc-nd/4.0/ Open Access Attribution-NonCommercial-NoDerivatives 4.0 International Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids Vacuum pumps Computational fluid dynamics Pumping machinery Supersonic air ejectors Aeronautical applications Compressible RANS simulations Operational map 0D model Bombes de buit Dinàmica de fluids computacional Maquinària de bombament Numerical modeling of air ejectors covering supersonic, subsonic and closed-port operations Article