Abstract
Five step cone gurations were designed to investigate the effects of inlet step cone gurations on the e ow structure and ignition of solid fuel behind a backstep. Experiments were conducted separately in a cold e ow for the e owe eld measurement and in a hot e ow for the fuel regression before ignition and ignition tests. The step height was e xed at 29 mm for each cone guration. The inlet velocity of the cold e ow was 15 m/s. The velocity e owe eld was measured with a laser Doppler anemometer and the ignition process was observed with a video camera. The cone guration of the inlet step signie cantly affected the turbulence intensity of the shear layer and the reverse e ow rate of the recirculation zone. The greater reverse e ow rate provided a better e ameholding capability, and hence, abbreviated the ignition delay. As the e ow was turbulent, the higher the turbulence intensity and the longer the ignition delay. When the oxygen concentration was higher than 19%, the effect of inlet cone guration on ignition diminished.
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