Unsteady 1D Gas Dynamics in Ejectors: a Pipeline Analogy

  • Van den Berghe, Jan (von Karman Institute for Fluid Dynamics)
  • Dias, Bruno Ricardo Barros (von Karman Institute for Fluid Dynamics)
  • Bartosiewicz, Yann (Institute of Mechanics, Materials, and Civil Engineering (iMMC) Universite catholique de Louvain (UCLouvain))
  • Mendez, Miguel Alfonso (von Karman Institute for Fluid Dynamics)

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We present a 1D unsteady ejector model based on a pipeline analogy. It consists of gas dynamic equations in three 1D domains that are coupled through a junction model. The formulation admits travelling pressure waves across the junction, allowing to simulate unsteady operation and to establish the characteristic response time after a change in operating conditions. We thus propose a low-cost alternative to CFD for unsteady ejector simulations, in conditions where pressure waves preclude a quasi-steady approach with more common 0D models.