Vortex instability in react flow of tangential combustor

The analysis of the averaged velocity distributions measured with the laser Doppler anemometer at the exit of the tangential burner in the reactant stream at different flow rates of the propane-air mixture (stoichiometric ratio, φ = 0,4) is described. The frequency of the precessing vortex core in the reactant stream is shown to be not a linear function of the mixture in contrast to isothermal conditions. The paper proposes possible reasons for the effect of reacting flow conditions on the frequency of the precessing vortex core: increasing size of the vortex core due to its filling with reaction products.