Learning Forum

[Elisa]

Hi all :) 

I am trying to model hydrogen combustion in the multizone homogeneous charge compression ignition engine model in Chemkin Pro. I need to be able to include hot surface ignition in the model. I have tried increasing the wall temperature (in the heat transfer tab) but this did not appear to have any effect. Can anyone tell me how I can represent hot surface ignition in these models please? Or if it is even possible.

really grateful for any help

[Judy Cooper]

Hi Elisa:

This should be possible if the change you make has a significant impact on temperature

The HCCI engine model has options for the heat transfer models (under the "Heat Transfer Parameters" tab): 

 

As a simple test, I would try the Heat Loss Heat Transfer Option first, because you can specify how much energy is removed from the system:

 

 

For the adiabatic condition, simply set the "Heat Loss" to 0.0:

 

 

Then, try a non-zero heat loss to evaluate the difference.

 

Heat loss affects the engine gas temperature, and most common combustion reaction rates are temperature-dependent; so changing the heat loss rate (heat transfer parameters) will have an impact  on the reaction rates.   (This effect will be positive or negative depending on the fuel species and conditions.)

 

I hope this helps.

 

Best Regards,

 

Judy