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Unsteady 1D Gas Dynamics in Ejectors: a Pipeline Analogy
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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.
