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- Title
An experimental study on the structural alteration of CH-air premixed flame affected by ultrasonic standing waves of various frequencies.
- Authors
Lee, Sang; Kim, Jeong; Kim, Heuy
- Abstract
This experimental study scrutinizes the structural variation of a premixed propane-air flame according to the frequency change of ultrasonic standing waves (USWs) at various equivalence ratios. Visualization technique via Schlieren photography is employed in the observation of the flame structure and in the analysis of the flame velocities along the propagation. A distorted flame front and horizontal splitting in the burnt zone result from the USW. The vertical locations of the distortion and horizontal stripes are closely dependent on the frequency of the USW. In addition, the propagation velocity of the flame front floored by the standing wave is greater than that in the case without the excitation by the standing wave. As expected, the influence of the USW on the premixed-flame propagation becomes prominent as the frequency increases. The results suggest that a well-defined USW may be applied to combustion devices, such as gas turbines and chemical rocket engines, to achieve an active control of the instability that frequently intervenes in such systems.
- Subjects
FLAME stability; COMBUSTION kinetics; FLAME visualization; ULTRASONIC waves; PROPANE flames; FREQUENCY changers; SCHLIEREN photography
- Publication
Journal of Mechanical Science & Technology, 2015, Vol 29, Issue 3, p917
- ISSN
1738-494X
- Publication type
Article
- DOI
10.1007/s12206-015-0205-z