Why the unburnt hydrocarbon emission is zero in Port fuel SI engine simulation using Ansys Forte ?

01 January 1970 1 6K Report

Recently, I was simulating the tutorial file "SIEngine_PortInjected_AMG_Tutorial.ftsim". After the simulation completed I got some results. I have some basic questions that make me doubt the solver, maybe I am wrong.

The questions are as follows:

100% combustion efficiency. ( On which basis combustion efficiency is calculated? ) I calculated fuel mass multiplied by LHV which is greater than the chemical heat release rate. How is that possible? This seems like an ideal case.

UHC is almost zero. How is this possible?

Fuel Mass per Engine Cycle is showing 2.07651E-002 [g], whereas in the excel sheet iC8H18 concentration is 2.18E-002 gram before combustion. Why there is a deviation?

Fuel Lower Heating Value per g 44.00000 [kJ]. This LHV value remains the same if I change the combustion from gasoline to CNG also. I guess it may affect results also.

Please answer these questions.

Dudley J Benton

Combustion efficiency is an input in such cases, not an output; that is, you tell the software (or it assumes) a combustion efficiency. If you have assumed it's 100% efficient, then there is no UHC, as this is an inevitable consequence of the assumption. You need to dig deeper into the science of combustion calculations and not rely on software that somebody else wrote for you.

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