FUEL LEWIS NUMBER EFFECTS IN UNSTEADY BURKE–SCHUMANN HYDROGEN FLAMES

Flame response (as determined by temperature and flame thickness) to unsteady hydrodynamics has been measured in acoustically pulsed Burke–Schumann hydrogen flames at two different oscillation frequencies and amplitudes. The effect of fuel Lewis number (Le F) on flame dynamics is isolated by investigating steady and unsteady 40% H2/60% He (Le F > 1) and 40% H2/60% Ar (Le F < 1) flames. For a given flame with Le F < 1, local temperature was found...