FURTHER EXPERIMENTS ON TURBULENT JET DIFFUSION FLAMES.

The earlier investigation of Kent and Bilger on the turbulent diffusion flame of a jet of hydrogen in a co-flowing stream of air is extended to give more detailed measurements of the nitric oxide field in the flame. Nitric oxide measurements appear to be particularly sensitive to the sampling method used and the results obtained with a small slender nosed sampling probe at near isokinetic conditions are considered to be more reliable than those for the large blunt-nosed probe used in the earlier investigation or those for the sonic sampling probe used by Lavoie and Schlader. Nitric oxide concentrations are found to peak on the rich side of stoichiometric and the mass balance on the center line indicates maximum nitric oxide production also on the fuel rich side.