No heat release in a simulation

luckyboy · April 18, 2018, 07:29

I'm simulating a SI engine with hydrogen as fuel. However, the result showed hydrogen wasn't ignited. It's just like a compression stroke.
In my case, there isn't spark plug geometry(I don't know if this can be done). I set a point coordinate as a source location, and the others such as source energy(0.02J), max temperature(50000K) is same as example case.
so what caused the problem?

Dan.Maciejewski · April 30, 2018, 14:46

There are many things to look at in this case to understand why ignition is not being predicted:

If SAGE is used for combustion, is it with a mechanism developed for hydrogen fuel combustion?
Is the fuel / air ratio in the correct range, and is it at sufficient temperature and pressure to sustain combustion?

While the energy source, modeling the spark, provides the initial energy input to begin the combustion, other conditions must be the correct range to sustain combustion.

April 18, 2018, 07:29	No heat release in a simulation	#1
luckyboy Member liyong Join Date: Feb 2017 Posts: 66 Rep Power: 9	I'm simulating a SI engine with hydrogen as fuel. However, the result showed hydrogen wasn't ignited. It's just like a compression stroke. In my case, there isn't spark plug geometry(I don't know if this can be done). I set a point coordinate as a source location, and the others such as source energy(0.02J), max temperature(50000K) is same as example case. so what caused the problem?

April 30, 2018, 14:46		#2
Dan.Maciejewski New Member Dan Maciejewski Join Date: Apr 2018 Location: Madison, WI, USA Posts: 11 Rep Power: 8	There are many things to look at in this case to understand why ignition is not being predicted: If SAGE is used for combustion, is it with a mechanism developed for hydrogen fuel combustion? Is the fuel / air ratio in the correct range, and is it at sufficient temperature and pressure to sustain combustion? While the energy source, modeling the spark, provides the initial energy input to begin the combustion, other conditions must be the correct range to sustain combustion. __________________ Dan Maciejewski Senior Research Engineer, Applications CONVERGECFD

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