Numerical Investigation of an Air Ejector Behavior in the Transient Operating Conditions of Ultra High Bypass Ratio (UHBR) Engine Bleed Systems

  • Vemula, Jagadish Babu (Universite catholique de Louvain)
  • Duponcheel, Matthieu (Universite catholique de Louvain)
  • Bartosiewicz, Yann (Universite catholique de Louvain)

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A typical supersonic ejector usually operates either in on-design (double-choked) or in off-design (singlechoked) conditions, representing a general performance curve in normal conditions. However, the ejector does not necessarily work in normal conditions for the UHBR bleed air application, justifying an in-depth analysis through the entire possible range of operation, including abnormal conditions. The current numerical study provides knowledge of these unconventional operating conditions and its time-dependent transition between any operating points. These operating conditions include the flow regimes such as closed primary, secondary, or outlet ports, reverse flows, and start and unstart conditions of the ejector.