Week 2 : Basic Calibration of Single cylinder SI-Engine

Assignment no 2

TASK 1 = Run the case at 1800 rpm

• air flow rate
• BMEP
• BSFC
• In-cylinder pressure

1. Air flow rate-

Air Flow Rate [kg/h] = 24.6

2. BMEP-

IMEP [bar] =10.61

FMEP [bar] = 1.13

BMEP= IMEP-FMEP

= 10.61-1.13

= 9.48 BAR

3.BSFC –

BSFC [g/kW-h] - 239.2

4. In cylinder pressure-

Maximum Pressure [bar] = 48.89

Task - 2. Increase the power output at 3600 rpm by 10%

At 3600 rpm the results are as follow -

1. Brake Power [kW] 7
2. Brake Torque [N-m] 3
3. Fuel Flow Rate [kg/h] 0
4. BSFC [g/kW-h] 8

Now to achieve 10% Inc. in power I have did these following changes

Case1 case 2

MBF50 Anchor Angle (def = 50% burn) 8 12

dur_comb Duration (def = 10% to 90%) 25 20

cr Compression Ratio 9.5 15

OUTPUT

Results case 1 case 2

Brake Power [kW] 16.7 18.3

Brake Torque [N-m] 44.3 48.5

Fuel Flow Rate [kg/h] 4.0 4.0

BSFC [g/kW-h] 241.8 217.4

Remarks – To achieve the 10% more power compression ratio is inc to 15 but it may lead to detonation in engine.