【摘要】 结合麦肯纳燃烧器,设计了液体燃料部分预混火焰近壁面燃烧的光学诊断系统,利用双色法和激光诱导荧光法,研究了壁面高度及壁面温度对于近壁面区域火焰温度场和甲醛分布的影响.结果表明,随着壁面高度增加或者壁面温度升高,火焰温度升高,高温区域面积增大并从火焰外侧向中心轴附近转移.甲醛LIF图像上的信号与温度分布中的低温区域基本吻合,随着壁面高度的增加,甲醛峰值下降,而火焰整体的甲醛分布范围变广.当壁面温度升高时,甲醛信号变弱,整体的分布范围也变小.更多还原

【Abstract】 An optical diagnostic system of a partially premixed flame near the wall was designed with a McKenna burner. The two-color method and laser-induced fluorescence(LIF) were used to investigate the temperature and formaldehyde distribution of the flame. The effects of height and temperature of the wall were also analyzed in detail. The results showed that hot areas may be found close to the outside and central axis of the flame. With increasing height or wall temperature,the flame temperature also increased. The high-temperature area extended and shifted from the outside of the flame toward the center axis,and the signals on the formaldehyde LIF image were relatively consistent with those of the low-temperature region in the temperature distribution. As the height of the wall increased,the peak value of formaldehyde decreased and the overall distribution range of formaldehyde in the flame widened. When the wall temperature increased,the formaldehyde signal decreased and the overall distribution range narrowed.更多还原