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If it is bellow the LFL than the H is not burning / reacting with the air.
What chemical reaction do you think the injected H is going to have with the fuel? ... If you're too lean to react with the air ... the only other thing to react with in the combustion chamber is the fuel... so what reaction with the fuel are you expecting?
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I answered this in part in my post above. The H2 readily forms reactive OH- radicals. This participates in the branch reactions of the combustion flame front.
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Also ... how lean are you planning to run the engine? ... you have the stoich air for the fuel's A:F ... and as lean as 25 more parts of air for each part of Hydrogen for the hydrogen to burn ... but you're saying you will be too lean for the hydrogen.
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The gasoline mass air/fuel ratio I would like to target is 30:1. Again, H2 is a relatively small quantity of reactant and not the bulk fuel. The gasoline makeup is what we are hoping to change with the addition of H2 and manipulation of certain parameters.