Drilling Performance of Rock Drill by High-Pressure Water Jet under Different Configuration Modes

Table 3

Drilling speed assisted with water jet under different configuration modes.

Bit type	Pressure; (MPa)	Drilling speed; (m/min)	Speed growth rate (%)	Orifice diameter; (mm)	Diameter growth rate (%)
NWB	0	2.213	0.000	44	0
NFB	10	2.679	21.078	42	−4.545
	15	2.791	26.113	43	−2.273
	20	2.670	20.639	45	2.273
	25	2.529	14.290	44	0.000
	30	2.418	9.255	45	2.273
	35	1.696	−23.366	45	2.273
	40	1.665	−24.783	46	4.545
NSB	10	2.230	0.764	48	9.091
	15	2.085	−5.772	49	11.364
	20	2.050	−7.353	48	9.091
	25	1.988	−10.182	50	13.636
	30	1.678	−24.193	52	18.182
	35	1.602	−27.628	54	22.727
	40	1.544	−30.212	55	25.000
NDB	10	2.327	5.148	43	−2.273
	15	2.614	18.132	46	4.545
	20	2.662	20.267	50	13.636
	25	2.691	21.594	52	18.182
	30	2.744	23.995	53	20.455
	35	2.838	28.250	54	22.727
	40	2.734	23.543	55	25.000