Validation of Brake Power & Torque of 4-Cylinder SI Engine by use of GT-Power

Title: SI Engine modeling

Objective: 1. To get engine specification & find out max torque & power for respective rpm

2. To find out following data

1. PV and log PV diag

2.cylinder pressure and burn rate

3. valve mass flow and pumping loop

Theory

In this challenge consider the 4 -Cylinder GDI engine & following specification taken for perform modeling

Engine specification

Hyundai Theta Engine

1. Cylinder bore : 88mm

2. Stroke length : 97mm

3.Valve train: DOHC

4. Fuel supply system: GDI

5.Power O/P: 121KW @5800RPM

6. Torque: 222 N-M @ 4250 N-M

7. Compression ratio: 10.3:1

8. Cylinder: 4

9. Engine: 4-Stroke Engine

4 Cylinder SI Engine Model

Setup for Run simulation

simulation run for 5 different engine rpm at full throttle open 90 degree angle, simulation duration consider 650 but solution is get steady state very early .

Cylinder specification

consider compression ratio 11.5 :1 for get maximum torque & power.

connecting rod length calculated by 1.5 * 97 =146 mm

Solution convergence

Output parameter @ various rpm

maximum BP & Torque achieved

BP=113kw @5800rpm , Torque= 233 N-m @4250 rpm

Result Plot

1. PV Cycle

2. log -PV Cycle

3. In- Cylinder Pressure

4.Burn Rate

5.Valve mas flow

6. Pumping loop

Conclusion

1. Get the engine specification & try to achieve the maximum power & torque

2. Make a case setup for various rpm & run the model until achieve the steady- state

3. Took snaps of various plot