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This work approaches numerical simulations applied for the investigation of vapor injection into a Capillary Jet Loop (CJL) system, aimed at the improvement of the injector design by investigating several parameters influencing its performance. Therefore, this paper will cover the influence of the entrainment ratio γ (ratio of the mass flow rate of the low-pressure flow – secondary flow - to the mass flow rate of the high-pressure flow - primary flow), the working fluid and the geometry on the pressure rise in the mixing region, the criterion chosen here for the injector efficiency. Considering that a full condensation is expected to occur, part of the simulation will also cover the numerical aspects related to phase-change. From Computational Fluid Dynamics (CFD) simulations, performed using the commercial software ANSYS-FLUENT 19.4, the parametric study showed a negative impact of the increasing injection angle on the pressure rise. The same negative impact was observed for the increase of the entrainment ratio. In terms of the working fluid, methanol and acetone proved to increase the pressure rise in the vapor injection region, inducing faster condensation, and consequently, affecting positively the injector efficiency.
Braga Vieira, C., Nicolle, T., Accorinti, F. de Ghelin, O. Goffaux, C. and Dupont, V.
Joint 21st IHPC and 15th IHPS
Joint 21st IHPC and 15th IHPS
