Ammonia Reaction with O2

I asked a similar question earlier that lead me to ask this question. NH3 and O2 react in the following way $$\ce{4NH3 + 3O2 -> 2N2 + 6H2O}$$ From my understanding Ammonia will explode(react quickly/release a lot of heat quickly is how I understand the term explode) when there is 15%-25% ammonia vapor in Air.

If I injected ammonia vapor into the air (above autoignition temperature of 651°C so that it's fuel to air ratio was more like 30% ammonia to air. Would it follow this reaction slowly until it reached the 25% mark then explode/react quickly until it reached the 15% ammonia balance air, and then react slowly from 15% ammonia to lower?

Here is the link to my similar question. Meaning of Flammability Limits and reaction in Air of Ammonia

• Are you certain that the oxidation of ammonia under these conditions does not yield nitric oxide instead of nitrogen? – Klaus-Dieter Warzecha Mar 1 '16 at 20:23
• I am not certain. – Pford Mar 1 '16 at 20:34