A numerical model was established to investigate the dynamic oscillation characteristics of supercritical carbon dioxide (sc-CO 2 ) impacting jets. The jet hydrodynamics, heat transfer, and physical properties of sc-CO 2 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-CO 2 impacting jet. Analysis of the flow field showed single or double high-speed sc-CO 2 mass structures for the sc-CO 2 impacting jet, revealing the generation mechanism of the impacting oscillation frequency and the mechanism of improved rock-breaking efficiency by sc-CO 2 jet. The oscillation frequency equation was obtained through a quantitative treatment of the velocity and motion area of the sc-CO 2 mass. Finally, the equation and simulation results were used to analyze the influences of the target distance, inlet pressure and temperature on the sc-CO 2 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.
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Zhang et al. (2018) studied this question.
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