Mechanical characteristics of high-pressure water jets impinging on coal

On the basis of conservation of mass and momentum, a mechanical model was established for high-pressure water jets impinging on coal.By using this model, the mechanical characteristics were analyzed for the intact water jet, cracked water jet, and the crushing zone and crater expansion zone of the coal.The system of ordinary differential equations was obtained to describe the process of high-pressure water jets impinging on coal.And the theoretical values were compared with the numerical simulation and the experimental results.The theoretical values are consistent with the numerical simulation and the experimental results.So the established mechanical model can reflect the actual process of high-pressure water jets impinging on coal.