Dynamic Weakening (Extinction) of Simple Hydrocarbon-Air Counterflow Diffusion Flames by Oscillatory Inflows | Zendy

G. L. Pellett | Zendy; Amy Kabaria | Zendy; Babita Panigrahi | Zendy; Katie Sammons | Zendy; Janet Convery | Zendy; Lloyd G. Wilson | Zendy

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Dynamic Weakening (Extinction) of Simple Hydrocarbon-Air Counterflow Diffusion Flames by Oscillatory Inflows

Author(s) -

G. L. Pellett,

Amy Kabaria,

Babita Panigrahi,

Katie Sammons,

Janet Convery,

Lloyd G. Wilson

Publication year - 2005

Publication title -

nasa sti repository (national aeronautics and space administration)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2005-4332

Subject(s) - extinction (optical mineralogy) , diffusion , simple (philosophy) , mechanics , hydrocarbon , materials science , environmental science , physics , optics , thermodynamics , chemistry , organic chemistry , philosophy , epistemology

This study of laminar non-premixed HC-air flames used an Oscillatory-input Opposed Jet Burner (OOJB) system developed from a previously well-characterized 7.2-mm Pyrex-nozzle OJB system. Over 600 dynamic Flame Strength (FS) measurements were obtained on unanchored (free-floating) laminar Counterflow Diffusion Flames (CFDF’s). Flames were stabilized using plug inflows having steady-plus-sinusoidal axial velocities of varied magnitude, frequency, f, up to 1600 Hz, and phase angle from 0 (most data) to 360 degrees. Dynamic FS is defined as the maximum average air input velocity (U air , at nozzle exit) a CFDF can sustain before strain-induced extinction occurs due to prescribed oscillatory “peak-to-peak” velocity inputs superimposed on steady inputs.

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