| 摘要 |
A piston (17) for an internal combustion engine. The piston (17) has a piston head (43) and a recess (46) formed in the piston head. A formation (91) is associated with the recess (46) for generating a turbulent motion in a fluid introduced into the recess. The formation (91) is configured to generate a swirling turbulent motion to the fluid introduced into the recess and preferably comprises spiral grooves (93) formed in the piston.
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