Experimental Study on Drag Reduction Characteristics of Bionic Earthworm Self-Lubrication Surface

Table 3

Natural factor level and its coding table.

	(N)	(ml/s)	(cm/min)
	51	0.1	500
1	46.56	0.09	447.82
0	34	0.06	300
1	21.44	0.03	152.18
-	17	0.02	100
	12.56	0.03	147.82

Note: means normal pressure; means flow rate of lubricating fluid; means forward velocity.