Fig. 1. Distribution cloud diagrams of (a) pressure and (b) velocity at 30° and 60° jet incidence angles and 22 m·s-1 velocity

Fig. 2. Pressure distribution curves of lateral centerline of wall at (a) 30° and (b) 60° jet incident angles with different water jet velocities

Fig. 3. Schematic of the impact force of water jets impacted on the surface of the material at different angles

Fig. 4. Results of test depth at different speeds for waterless, 30° and 60° jet injection angles (×30)

Fig. 5. Test width results at different speeds for waterless, 30° and 60° jet injection angles (×40)

Fig. 6. Test surface topographies of waterless, 30° and 60° jet injection angles at 17 m·s-1