Velocity measurements in an unsteady counterflow diffusion flame using laser Doppler velocimetry

Michele E. DeCroix*, William L. Roberts, Richard D. Gould

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Local strain rates in an unsteady counterflow diffusion flame were experimentally measured as a function of initial strain rate, oscillation frequency, and amplitude of the imposed fluctuation for both strong and weak hydrocarbon flames. The strain rate was determined by curve fitting the measured axial velocity profile just before the preheat zone and finding the curve fit's maximum derivative. The phase relationship between speaker deflection and velocity fluctuation was quantified. The velocity profile was measured assuming both constant and variable phase angle to quantify the effect of the phase angle dependence on spatial location in the flow field. At the phase angle corresponding to maximum velocity, the strain rate was measured at oscillation amplitudes near the flame extinction limit for propane/air and both diluted and undiluted methane/air flames. At one frequency, the strain rate was measured at four different phase angles within the velocity oscillation. Flow reversal occurred in the strongly burning propane and methane flames at very low applied voltages. However, the weakly burning diluted methane flame extinguished before flow reversal occurred.

Original languageEnglish (US)
Title of host publicationAmerican Society of Mechanical Engineers, Fluids Engineering Division (Publication) FED
Editors Anon
PublisherASME
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1998 ASME Fluids Engineering Division Summer Meeting - Washington, DC, USA
Duration: Jun 21 1998Jun 25 1998

Other

OtherProceedings of the 1998 ASME Fluids Engineering Division Summer Meeting
CityWashington, DC, USA
Period06/21/9806/25/98

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Velocity measurements in an unsteady counterflow diffusion flame using laser Doppler velocimetry'. Together they form a unique fingerprint.

Cite this