Low-speed diesel engines and some medium and high-speed diesel engines mainly use open combustion chambers without vortex.
The combustion chamber is formed by the bottom surface of the cylinder head and the top surface of the piston, and has an integral space of a certain shape. The multi-hole injector (6-10 holes) can make the fuel atomize well and distribute it evenly in the combustion chamber space.
Therefore, the combustion in the open combustion chamber is a typical spatial combustion process, requiring the combustion chamber to match the shape and distribution of the oil jet. Its advantages are low fuel consumption and easy starting; the disadvantage is that fuel atomization requires high, and it is difficult to adapt to variable speed work.