• The combustion bowl is one system which plays an important role in providing the right kind of air motion with respect to the fuel sprays and also in ensuring that the combustion process will be complete with low levels of pollutants being emitted.
• In order to achieve these, the air or fuel in the combustion bowl should not remain stagnant. Instead, they must be moved around the bowl with enough turbulence to prevent the fuel from forming over-rich and under-lean pockets thereby improving fuel utilization and reducing in-cylinder pollutants. This can be achieved by charge motion within the cylinder, which is of two main types; swirl and squish in any engine. The combustion bowl should also divide the fuel so that it reaches all areas so that the air inside is utilized well.
• The combustion bowl of the type shown in Fig. 1, is called the re-entrant bowl. Currently, variants of the re-entrant type of combustion bowl are widely used across all industrial and automotive diesel engines.
• However, it is widely believed that the re-entrant bowl has reached its full potential and cannot cater to future emission norm requirements. Thus, the time has come to rethink and come up with a new combustion bowl that can outperform the current design.

• The invention present a solution with a novel deep lip twin chamber diesel engine combustion bowl (DLTCCB) design for improved combustion and performance of a direct injection (DI) diesel engine.

DESIGN

The novel combustion bowl design includes:

• A lower chamber forming a primary combustion zone and;
• An upper chamber forming a secondary combustion zone.
• The lower chamber has a first curved profile that ends in a first inward curved lip-like projection of a wall of the bowl.
• The upper chamber has a second curved profile (112) that ends in a second inward curved lip-like projection of the bowl.
• The second lip-like projection has a smaller radius than the first lip-like projection.