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Experimental Investigation of Flame Structure and combustion limit During Premixed Methane/Air Jet Flame and Sidewall Interaction

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Energy Engineering 2021年第1期118卷 37-52页

作者： Ying Chen Jianfeng Pan Qingbo Lu Yu Wang Chenxin Zhang School of Energy and Power Engineering Jiangsu UniversityZhenjiang212013China

The effects of inlet gas parameters and sloping sidewall angle on the flame structure and combustion limit with and without sidewall were experimentally *** height and impact angle were obtained by chemiluminescence intensity analysis of CH****,the combustion characteristics of flame with and without sidewall at different equivalence ratios were explored;then,the influence of Reynolds number and inlet gas temperature on flame structure and combustion limit of v-shaped flame with sidewall were analyzed,and the results with sidewall were compared with those without ***,the variation trend of flame parameters with different sloping sidewall angles was *** experimental results show that the existence of sidewall makes flame shape change from“M-shaped”to“inverted N-shaped”,and conical shape to trapezoidal *** inhibition effect of sidewall on flame stretching downstream is strengthened with the increase in Reynolds number;but as the temperature of the inlet gas increases,the inhibitory effect is obviously *** sloping sidewall angle decreases from 90°to 55°at 5°intervals,flame height and impact angle of v-shaped flame reach the extreme value whenβ=80°.Compared with the case without sidewall,the range of v-shaped flame with sidewall has no obvious trend of broadening or shrinking when inlet gas temperature is increased;however,as sloping sidewall angle decreases,the range of the v-shaped flame shrinks obviously and flammability limit increases significantly.

关键词： Sidewall premixed flame flame-wall interaction flame structure combustion limit

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