A Novel Numerical Simulation of OH Radical PLIF Imaging in Hydrogen-Air Combustion

What is it about?

With the present computational abilities, it is possible to simulate complicated and sophisticated experimental measurements using numerical methods. Planar laser-induced fluorescence (PLIF) of OH radicals is such an experimental method that accurately defines where the reaction (fuel-oxidizer) is happening. The paper presents a novel numerical method to simulate the OH-PLIF of a hydrogen-air combustion in a constant volume channel. The method uses a priori known excitation states of different species and energy transitions in the absorption and fluorescence process. The results show flame dynamics and tulip flame formation in a closed channel combustion of hydrogen-air premixed mixture.

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Photo by Marek Piwnicki on Unsplash

Photo by Marek Piwnicki on Unsplash

Why is it important?

It is highly useful for hydrogen flames, especially at lean mixtures, which usually do not produce any emitted light from the flame. Numerical methods help complement the experiments in detailed and less complicated diagnostic methods.