Week-4 : Basic Calibration of Single cylinder CI-Engine

Aim/Introduction - 

1. Compare SI vs CI .

2. Analysis of important parameters and its  impact on performance.

Task 1 - 

Particulars                                                   SI                                                            CI

Operating cycle                                 It operates on otto cycle                      It operates on diesel cycle

Fuel used                                            Petrol is used as fuel.                            Diesel is used as fuel.

Thermal efficiency                              less thermal efficiency.                     high thermal efficiency.

Intake                                                 Air + fuel.                                               Only air.

Noise                                                   less noisy                                               more noisy

Compression ratio                               Low compression ratio.                        High compression ratio

Maintenance cost                                Less                                                       More

Weight of engine                                Less                                                       More

Cylinder pressure                              less                                                         More

Task 2 - 

1.BSFC - It is rate of fuel consumption to produce to 1 kw brake power in 1hr. It show the fuel oil cons.  to get desired output.

2.A/F Ratio - It plays main role in consumption.Rich or lean mixture decides our combuction process. In SI A/F is limited to 14.5 to avoid detonation. In CI A/F normally is near by 19.

3.Exhaust Temperature - Exhaust temprature of cylinder depends on its combustion process, Fuel injection, V/v timmings etc.

Task 3 -

1.Case setup setting  @ 3600 rpm shown in figure 1

2. steady state is achieved in 5 periods.

Figure 1- 

Power , Torque and other parameters are listed below.

Remarks / conclusion

It has been observed that 

1. With MFB 50 the torque and bhp is reduced.

2. with MFB 50 th bsfc is also increased.