Based on the Bunsen flame method and digital image processing technology,the ground-based experiments for measuring the flame speed of methane and ethylene were carried out using combustion science rack aboard china space station,to provide ground data for future comparison of space-ground(microgravity-normal gravity)combustion experiments,and to lay the foundation for the on-orbit combustion scientific research of Combustion Science Rack.According to the results,as the equivalence ratio increased,the flame speed increased first and then decreased,but the flame height decreased first and then increased,both of which reached their maximum or minimum value at around the equivalent ratio of 1.04.The maximum flame speed of methane premixed combustion was approximately 37.36 cm/s,while that of ethylene premixed combustion was approximately 67.58 cm/s,with the latter being about 1.81 times higher than the former.As the equivalence ratio was constant,the variation of outlet flow rates and Reynolds number of unburn air-fuel mixture gave a noticeable change in flame height but did not affect the flame speed.
关键词
动力机械及工程/燃烧科学柜/火焰传播速度/本生火焰/图像处理
Key words
power machinery and engineering/combustion science rack/flame speed/Bunsen flame/image processing
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