Abstract
Hydrogen/helium mixtures were injected transversely into a hot air stream of Mach Number 2, and the mixing process and the progress of reaction were investigated by withdrawing samples with water-cooled probes. The amount of fuel reacted was determined from the difference between a fictitious hydrogen fraction, obtained by multiplying the local helium fraction with the initial H2/He ratio, and the local hydrogen content. Test measurements with probes of different diameters showed that, under the experimental conditions, the composition of the samples is not measurably influenced by an acceleration of the reaction behind the bow shock at the front of the probe. Vertical and horizontal concentration profiles of the injected gas have high maximum values close to the injection nozzle, and flatten downstream where the mixing zone broadens. The results show how the reaction proceeds from the hot outer boundary of the mixing zone into the inner fuel-rich section, and how it is promoted by increasing the air-stream temperature and the fuel pressure, and by injecting the fuel upstream.
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