Position of the flame
leading edge relative to the mean fuel concentration as calculated from the approach
of Tieszen et al. [22] for two
cases without coflow. For Case 1
(circles), the fuel velocity is increased from 46.6 m/s to 50.4 m/s (line 1,
Table 1) from the first series of experiments. For Case 2 (triangles), the fuel velocity is 54.3 m/s from the second
series. What is notable is that the
position where the axial oriented flame is lost corresponding to the approximate
position of the lean limit.
