Opposed jet diffusion flames of nitrogen-diluted hydrogen vs air - Axial LDA and CARS surveys; fuel/air rates at extinction

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5652745

Pellett, G L; Northam, G B; Wilson, L G; Jarrett, O Jr; Antcliff, R R

An experimental study of H-air counterflow diffusion flames (CFDFs) is reported. Coaxial tubular opposed jet burners were used to form dish-shaped CFDFs centered by opposing laminar jets of H2/N2 and air in an argon bath at 1 atm. Jet velocities for extinction and flame restoration limits are shown versus input H2 concentration. LDA velocity data and CARS temperature and absolute N2, O2 density data give detailed flame structure on the air side of the stagnation point. The results show that air jet velocity is a more fundamental and appropriate measure of H2-air CFDF extinction than input H2 mass flux or fuel jet velocity. It is proposed that the observed constancy of air jet velocity for fuel mixtures containing 80 to 100 percent H2 measure a maximum, kinetically controlled rate at which the CFDF can consume oxygen in air. Fuel velocity mainly measures the input jet momentum required to center an H2/N2 versus air CFDF. 42 refs.

• OSTI ID: 5652745
• Report Number(s): AIAA-Paper--89-2522; CONF-8907118--
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ANEMOMETERS
DIFFUSION
ELEMENTS
EMISSION SPECTROSCOPY
ENGINES
FLAMES
FLUID FLOW
FUEL-AIR RATIO
FUELS
HEAT ENGINES
HYDROGEN FUELS
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
NITROGEN
NONMETALS
RAMJET ENGINES
SPECTROSCOPY
SUPERSONIC FLOW
SYNTHETIC FUELS