Unsteady 1D gas dynamics in ejectors: a pipeline analogy
(2023) 22nd Computational Fluids Conference — Location: Cannes (25.April.2023)
Files
Details
- Authors
- Abstract
- 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 inspired by the model of Mindt and Lang. 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. The model was first calibrated and validated in steady state against experimental mass flow rates in on- and off-design operation on a sonic and a supersonic ejector. Next, the choking mechanism is shown to be compliant with the compound choking theory for ejectors. Finally, the model was benchmarked against 2D URANS simulations in a sudden transient between operating conditions. The model correctly predicts the stream-wise evolution of integral quantities such as mass, momentum and energy flow rates and remains robust even in case of back flow. 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.
- Affiliations
Citations
Van den Berghe, J., Dias, B. R. B., Bartosiewicz, Y., & Mendez, M. A. (2023). Unsteady 1D gas dynamics in ejectors: a pipeline analogy. 22nd Computational Fluids Conference, Cannes. https://hdl.handle.net/2078.5/27243