Effect of abrasive mass flow on the abrasive acceleration and erosion rates of abrasive gas jets

The mass flow of abrasive is one of the significant factors, which affects the erosion rate of abrasive gas jet eroding rock and coal, because it affects rebounding abrasives and the shielding effect. However, the effect of abrasive mass flow on abrasive acceleration has been little studied in favor of research on abrasive particle erosion, which is of prime importance for the determination of how the mass flow affects the erosion rate. Therefore, in this study, the effect of mass flow on erosion rates was investigated by numerical simulation and experiment, to analyze the effect of mass flow on abrasive acceleration. It can be concluded that the influence of pressure cannot be ignored, as it determines the time and distance of abrasive acceleration. Each pressure has a corresponding optimal mass flow that can achieve the maximum erosion rate. The erosion rate begins to decrease when the mass flow exceeds the optimal value. The wave-like flow-field structure of free jets influences the distribution character of the abrasive, and leads to the formation of the annular structure of the abrasive flow field. The mass flow barely affects the distribution of abrasive, but clearly affects the abrasive velocity. As the mass flow increases, the distance and time of acceleration of the abrasive decrease, which causes the amount of high-speed abrasive on both sides of the jet axis to decrease and the velocity also decreases.