The role of combustion chamber in the C.I. engines is to provide proper mixing of fuel and air in the shortest possible time. From combustion phenomenon of C.I. engines, it is evident that fuel-air contact must be limited during the delay period in order to limit, the rate of pressure rise in the second stage of combustion. This result can be obtained by shortening the delay to achieve high efficiency and the combustion must be completed when piston is nearer to TDC, it is necessary to have rapid mixing of fuel and air during the third stage of combustion.
The design of combustion chamber for C.I. engines must also take consideration of injection system and nozzles to be used.
The following are the fundamental considerations in the CI combustion chamber design :
1. High thermal efficiency
2. Ability to use less expensive fuel
3. Ease of starting
4. Ability to handle variations in speed
5. Smoothness of operation i.e. Avoidance of diesel knock and noise
6. Low exhaust emission
7. Nozzle design
8. High volumetric efficiency
9. High brake mean effective pressure (bmep)
The design of combustion chamber for C.I. engines must also take consideration of injection system and nozzles to be used.
The following are the fundamental considerations in the CI combustion chamber design :
1. High thermal efficiency
2. Ability to use less expensive fuel
3. Ease of starting
4. Ability to handle variations in speed
5. Smoothness of operation i.e. Avoidance of diesel knock and noise
6. Low exhaust emission
7. Nozzle design
8. High volumetric efficiency
9. High brake mean effective pressure (bmep)
