IC Engine Calibration using GT Power CI vs SI

• COMPARE 1 CYLINDER SI ENGINE AND 1 CYLINDER CI ENGINE

The CI Engine chosen was a 1 Cylinder GDI Engine with the same Cylinder Geometry of that of the SI engine previously modelled i.e,

1. Bore = Stroke = 86 [mm]
2. Connecting Rod Length = 175.0 [mm]

However, For practical purposes , Certain parameters were varied.

• The Inlet temperature is 350K [SI = 300k] and Inlet pressure is 2.5 bar [SI = 1bar]

• The Inlet Diameter is 40mm which the same for SI but the Length of the inlet port is 120mm [SI = 350mm] because SI uses Port fuel injection and CI uses GDI hence the smaller length.

• The Injected mass is 0.08g [Injection Delivery rate for SI = 8g/s] because Diesel engines are lean burned.

RESULTS POST PROCESSED WITH GT POST :

CI SI

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The above tables show a detailed comparison of CI vs SI Engines for the same cylinder Geometry

CHANGE MFB (Mass Fraction Of Fuel Burned) to 50%

Its been observed that changing to MFB50 results in decrease in performance in terms of Power Output and CO,HC and Nox Emissions