Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8055534 | Acta Astronautica | 2018 | 16 Pages |
Abstract
In this study, the effects of gaseous methane/oxygen injection velocity ratio on the shear coaxial jet flame structure are analyzed using high-speed imaging along with OH* and CH* chemiluminescence. The images show that, as the velocity ratio is increased, the visual flame length increases and wrinkles of the flame front are developed further downstream. The region near the equivalence ratio 1 condition in the flame could be identified by the maximum OH* position, and this region is located further downstream as the velocity ratio is increased. The dominant CH* chemiluminescence is found in the near-injector region. As the velocity ratio is decreased, the signal intensity is higher at the same downstream distance in each flame. From the results, as the velocity ratio is decreased, there is increased entrainment of the external jet, the mixing of the two jets is enhanced, the region near the stoichiometric mixture condition is located further upstream, and consequently, the flame length decreases.
Related Topics
Physical Sciences and Engineering
Engineering
Aerospace Engineering
Authors
Myungbo Shim, Kwanyoung Noh, Woongsup Yoon,