✍ Scribed by S.C. Taylor; D.B. Smith
No coin nor oath required. For personal study only.
A recent paper by Tseng et al. [1] describes the measurement of burning velocities and Markstein numbers in expanding spherical flames. The main source of data used for comparison with their experimental results was the Ph.D. thesis of Taylor [2]. Tseng et al.'s paper [1] contains some major errors which will be described below. One result of these errors was to misrepresent Taylor's burning velocities, and the main aim of this note is to set the record straight.
Tseng et al. reworked Taylor's raw data [2] and presented the resulting burning velocities in their Figs. 3456. These new values were attributed to Taylor, although in most cases they differ considerably from those obtained by him. For example, the maximum burning velocity presented for methane/air is 0.51 m s 1, while Taylor's result [2] was 0.37 _+ 0.01 m s 1. For ethane the maximum is 0.48 m s-1 instead of 0.41 _+ 0.01 m s-1 and for ethylene it is 0.62 m s ~ instead of 0.66_+0.02m s 1. Only the propane values are approximately correct. This attribution to Taylor of results which are not his puts us in an uncomfortable position since a major thrust of our work is to show that the burning velocities of methane and other fuels are lower than generally believed [2][3][4].
The reason for the disparities is clear. Most of the density ratios quoted in Tseng et al.'s Table 1 differ from those calculated using a standard package such as STANJAN [5] by amounts ranging from -35% to +19%. The STANJAN values agree very well with our own calculations, and in the case of methane are further supported by the data appearing in Fig. 5 of Ref. 6. Thus there seems no doubt that *Corresponding author.
📜 SIMILAR VOLUMES
## D mass diffusivity K flame stretch Ka Karlovitz number