Open AccessEffect of Pulsating Flame Jet on Flow and Heat Transfer Characteristics
Author(s) -
Wongsathon Boonyopas,
Nuttamas Uppatam,
Chattawat Aroonrujiphan,
Natthaporn Kaewchoothong,
Somchai Sae-ung,
Chayut Nuntadusit
Publication year - 2020
Publication title -
journal of advanced research in fluid mechanics and thermal sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.247
H-Index - 13
ISSN - 2289-7879
DOI - 10.37934/arfmts.77.1.1123
Subject(s) - jet (fluid) , mechanics , nozzle , heat transfer , reynolds number , materials science , heat flux , premixed flame , solenoid valve , laminar flame speed , chemistry , combustion , thermodynamics , analytical chemistry (journal) , turbulence , physics , combustor , chromatography , organic chemistry
This research aims to study the effect of pulsating frequency on flame structure and heat transfer characteristics of premixed flame from a pipe nozzle. The LPG and air were used as gas fuel and oxidizer. The equivalence ratios ( ) were evaluated at 0.8, 1.0, and 1.2 under a constant Reynolds number Re = 500. The effect of nozzle-to-impingement surface distance ratio was investigated at H = 2D to 10D, here D is the nozzle diameter at 12 mm. The frequency of pulsating (f) was varied from f = 0 to 10 Hz using a solenoid valve. The flame structures of free flame jet and the impinging flame jet were recorded with a digital camera. The average heat flux on impingement surface was measured with water cooling plate and evaluated from the heat balance of the cooling water. The results show that the pulsating of flame jet become having gap on flame and the mushroom appear at the end of flame. The size of mushroom structure becomes larger when increasing the frequency. While the non-pulsating jet did not appear in this structure. Pulsating flame jet can increase the overall average heat flux on the impingement surface up to about 12% for case of = 1.2 and H = 2D and f = 10 Hz. when compared to case of f = 0 Hz.