Assignment 2

Ans. 1

Air flow rate= 6.84 gram/sec (At intrunner)

BMEP= 9.47 bar

BSFC= 239.171 gram/kW-kr

Cylinder pressure= 48.89 bar

Ans. 2

Initial brake power= 16.69 kW@3600 rpm

Final brake power= 18.37 kW@3600 rpm

Thus power has been increased by 10.06%

Changes made in initial model:

Attribute name	Initial value	Final value
Injection rate (g/sec)	6	7
Inlet valve cam timing angle (Crank degrees)	478	450
Anchor angle (CA50)	8	6
Compression ration	9.5	11.5

The above changes has been done to minimise the changes in the GT initial model.

1. Injector rate can be increses by adjusting its valve.

2. Cam shaft has to be changed for changing cam timing angle.

3. CA50 position can be adjusted by changing spark timing.

4. Compression ratio can be changed by changing piston bowl volume.