Interaction of a plane flame front with the wake of a cylinder

Conference · Sat Oct 01 04:00:00 EDT 1977

OSTI ID:5324269

Namer, I.; Agrawal, Y.; Cheng, R. K.; Robben, F.; Schefer, R.; Talbot, L.

A Rayleigh scattering and laser Doppler velocimetry system has been developed for studying the interaction between the vortex street behind a cylinder and a two dimensional plane flame front. Measurements on an open jet methane/air flame stabilized on a heated 0.25 mm platinum wire showed appreciable instabilities in the flame due to the turbulent eddies in the mixing region of the jet. By enclosing the flow in a square channel flame stability was increased. A 3.2 mm diameter cylinder, with Ud/..nu.. = 90 fd/U = 0.16, was used to generate a Karman vortex street at a frequency of 22 Hz. Measurements indicated that the flame motion in the wake is small compared to the scale of vortices shed by the cylinder, but the rms fluctuations in velocity in the wake of the cylinder were comparable to the rms fluctuations in Rayleigh scattering through the flame. Furthermore, the flame upstream of the wake region also fluctuated which would indicate that as a portion of the flame fluctuates, it perturbs the entire flow field upstream.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5324269
• Report Number(s): CONF-771015-13
• Country of Publication: United States
• Language: English

Related Subjects

090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
ALKANES
COMBUSTION INSTABILITY
CRYOGENIC FLUIDS
FLAMES
FLUIDS
HYDROCARBONS
INSTABILITY
METHANE
ORGANIC COMPOUNDS
TURBULENCE