Dynamic simulation of the oscillation characteristics of supercritical carbon dioxide impacting jets

Abstract

A numerical model was established to investigate the dynamic oscillation characteristics of supercritical carbon dioxide (sc-CO₂) impacting jets. The jet hydrodynamics, heat transfer, and physical properties of sc-CO₂ fluid were incorporated into the model. The coupling of multiple fields with large velocity and pressure gradients was achieved using a modified SIMPLE segmentation algorithm. Laboratory experiments validated the reliability of the numerical model by detecting dynamic changes in the pressure on the centerline of the sc-CO₂ impacting jet. Analysis of the flow field showed single or double high-speed sc-CO₂ mass structures for the sc-CO₂ impacting jet, revealing the generation mechanism of the impacting oscillation frequency and the mechanism of improved rock-breaking efficiency by sc-CO₂ jet. The oscillation frequency equation was obtained through a quantitative treatment of the velocity and motion area of the sc-CO₂ mass. Finally, the equation and simulation results were used to analyze the influences of the target distance, inlet pressure and temperature on the sc-CO₂ jet oscillation characteristics. The results showed that the oscillation frequency and amplitude first increased and then decreased with increases in the target distance. The oscillation frequency and amplitude both increased with increasing inlet pressure; the oscillation frequency increased slowly with increasing temperature.

Keywords

Supercritical carbon dioxide dynamic simulation oscillation computational fluid dynamics impacting jet

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