EngMod4T

Post4T - The post processing software

Post4T: RPM Based Output.

Selecting to display "Performance and Efficiency Plots" from the main menu opens the following dialog box:

Once a file has been selected the following results are available:

  1. RPM         Simulated engine rpm
  2. P-av           Average engine power over the last three cycles (kW)
  3. Torque      The engine torque related to P-av.(Nm)
  4. Tex-AvC   Average temperature in center of exhaust (C)
  5. Power        Power per cylinder (kW)
  6. Imep           Indicated mean effective pressure per cylinder (bar)
  7. Bmep         Brake mean effective pressure per cylinder (bar)
  8. Fmep          Friction mean effective pressure (bar)
  9. Dratio         Delivery ratio per cylinder
  10. Purc            Purity of the mixture in the cylinder at exhaust port closure
  11. Seff            Purity of the mixture in the cylinder at transfer port closure
  12. Teff            Trapping efficiency per cylinder
  13. Ceff            Charging efficiency per cylinder
  14. BSFC          Brake specific fuel consumption per cylinder (kg/kWh)
  15. TC-av         Average maximum cylinder temperature per cylinder (C)
  16. TUBmax    Maximum unburned mixture temperature per cylinder (C)
  17. MaxDeg     Degrees after TDC where maximum cylinder pressure occurs per cylinder
  18. Timing        Ignition timing (BTDC)
  19. Delay          The user prescribed delay period in degrees (deg)
  20. Durat          The user prescribed combustion duration (burn period) in degrees (deg)
  21. TAF            Trapped Air/fuel ratio
  22. VibeDelay  The calculated delay period for a turbulent combustion model)
  23. VibeDurat  The calculated burn period for a turbulent combustion mode)
  24. VibeA        The calculated Vibe A value for a turbulent combustion model
  25. VibeM       The calculated Vibe M value for a turbulent combustion model

If the engine is turbocharged the following values are included:

  1. Boost         The simulated boost pressure (bar guage)
  2. BackPr       The simulated back pressure (bar guage)
  3. Pratio         The ratio between the boost pressure and the back pressure.
  4. TTurbine    The simulated turbine inlet temperature (C)

 

Total Power

This shows the predicted power curve for the Mini 1000cc engine.

Power for Cylinder 3 and 4

To study the effect of the air stealing in the siamesed inlet ports the individual cylinder's power is plotted. It clearly shows that cylinder 3 is strangled.

Delivery Ratio for Cylinder 3 and 4

To see if it really is the "air stealing" effect the delivery ratio for the two cylinders is displayed. It clearly shows that cylinder 4 gets filled a lot better than cylinder 3 and therefor makes more power.

 

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