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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

ON PIV MEASUREMENTS OF DIFFUSION FLAMES

Adam B. Herrington
Oklahoma State University, Stillwater, OK 74078, USA

Khaled A. Sallam
School of Mechanical and Aerospace Engineering, Oklahoma State University, Tulsa, OK 74106, USA

Abstract

The challenges of conducting Particle Image Velocimetry (PIV) measurements in diffusion flames are discussed in the present work. The mass entrainment was calculated locally and globally along the length of the flame. The local entrainment matched well with literature values of buoyancy driven entrainment. The spreading parameter value was 0.09. The global entrainment coefficient stabilized from an initially high value down to Ce = 0.325. Using the global entrainment coefficient, the length required to entrain the total air mass needed to achieve a stoichiometric combusting mixture of propane and air was compared against the visible flame length observed and calculated. It was found that the flame received the needed air in 236 mm downstream of the orifice and the visible flame length was 269 mm. The difference between the lengths can be attributed to the time delay between receiving the needed air into the mixture and reaching the combustion zone. Finally, the solid particle seeder was proven operational and is available for future testing.

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