- Author
-
Ito, A.
|
Narumi, A.
|
Konishi, T.
|
Tashtoush, G.
|
Saito, K.
|
Cremers, C. J.
- Title
- Measurement of Transient 2-D Profiles of Velocity and Fuel-Concentration Over Liquids.
- Coporate
- Kentucky Univ., Lexington
- Sponsor
- National Institute of Standards and Technology, Gaithersburg, MD
- Report
-
NIST GCR 96-704
December 1996
24 p.
- Distribution
- Available from National Technical Information Service
- Contract
- NIST-GRANT-60NANB4D1674
- Keywords
-
pool fires
|
velocity
|
temperature
|
flame spread
- Abstract
- We recently developed two different optical techniques in order to simultaneously measure transiet 2-D profiles of velocity, temperature and fuel concentration which were generated by a spreading flame over liquids. The first technique, PTLS employs a particle-track system combined with a laser-sheet system and a high speed camera, while the second technique employs a dual wavelength holographic interferometer (DWHI). The PTLS system revealed transient 2 D profiles of flame incuded flow, while DWHI revealed 2 D profiles of fuel concentration over liquids. In this paper we present a series of velocity profiles for a pulsating flame spread over propanol and concentration profiles for gaseous propanol determined with PTLS and DWHI respectively. Other researchers have predicted the formation of small twin circulations, one a gas-phase circulation just ahead of the flame's leading edge, and the other a small liquid circulation just underneath the gas-phase circulation. Our PTLS results confired these predictions, i.e., the formation of a millimeter-diameter circulation in the gas phase and an accompanying liquid flow. Based on these data, we offer a phenomenological explanation of the mechanism of pulsating flame spread. In addition, we show that DWHI is a very promising technique for measuring transient fuel-concentration profiles over liquids.