Affect of pressure on formation if nitrogen oxide from nitrofen and oxygen
Answers
A study has been made of nitric oxide formation in a laminar CO-air diffusion
flame over a pressure range from 1 to 50 atm. The carbon monoxide (CO)
issued from a 3.06-mm-diameter port coaxially into a coflowing stream of air
confined within a 20.5-nun-diameter chimney. Nitric oxide concentrations from
the flame were measured at two carbon monoxide (fuel) flow rates: 73 standard
cm3/min (sccm) and 146 sccm.
As the pressure was increased above 1 atm, the flames changed shape from
wide and convex at the lowest pressures to slender and concave at 50 atm,
with the most noticeable change occurring below about 10 atm. Flame height
decreased as the pressure was increased from 1 atm to about 10 atm, but height
was independent of pressure at higher pressures. The regimes of stable burning
decreased with increasing pressure up to 50 atm, with the greatest reduction
occurring between 1 and 20 atm.
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