Estimation of the characteristic time scale of a laminar flame by the PIV method

This paper first presents chemical time scale values measured by the PIV method for premixed methane-air and dimethyl ether-air flames depending on the equivalence ratio and the concentration of the inhibitor trimethyl phosphate at atmospheric pressure. Comparison of the experimental results with theoretical estimates made based on the Zeldovich–Barenblatt hypothesis shows their qualitative agreement. The chemical time scale within the accuracy of the experiment depended only on the burning rate, rapidly decreasing as it increases. At fuel-air flame speeds close to and above 0.6 m/s, the results of the experiments shown high accuracy of theoretical estimates based on the Zeldovich–Barenblatt hypothesis.