Abstract
The simple method previously proposed for estimating the maximum temperature of a diluted micro hydrogen diffusion flame from its composition index has been examined experimentally, using a thermocouple, and has been shown to be satisfactory in certain selected cases. The flames selected were those giving maximum response in the hydrogen flame ionization detector. The apparent maximum error in the temperature estimation of a nitrogen-diluted flame is ±8%. The most commonly used nitrogen-diluted flame, giving the optimum ion current, has a composition index of about Id = 0.21. For an initial gas temperature of 393K, this flame has an estimated temperature of about 2030K. The temperature determined experimentally was 2153K ± 3.3%. The temperatures of flames having diluents other than nitrogen (e.g., He, Ne, Ar, CO2) were all shown to be approximately the same as the temperature of the nitrogen-diluted flame, for compositions giving the maximum ion current. Isotherms of the nitrogen-diluted micro premixed and diffusion flames are shown.
Published Version
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