Wear Performance of Bionic Dimpled-Shape Pistons of Mud Pump

Table 2

Influence of central included angle on piston service life.

Piston number	Diameter of dimple at lip, D (mm)	Spacing, L (mm)	Central included angle, α (°)	Diameter of dimple at root, D′ (mm)	Average service life of piston (h)	Increased service life (%)
L-Standard	0	0	0	0	54.67	—
L-D2	3	5.5	12	0	76.83	40.53
L-S1	1.5	5.5	3	0	105.00	92.06
L-S2	4.5	5.5	27	0	59.50	8.83