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为了进一步理解火焰稳定的详细机理,采用钝体作为火焰稳定机理的研究模型,详细分析了火焰根部流场特性对于火焰稳定的影响。研究了二维通道中不同尺寸V型钝体在不同进口速度下的反应流场,分析了预混煤油火焰根部特性。进口煤油和空气的当量比为Φ=0.6,进口温度300K,环境压力0.1MPa。结果显示在钝体分别为小尺寸、中间尺寸和大尺寸时,钝体后火焰根部特征、回流区特征和火焰根部位置随进口速度变化的规律都各不相同。当D=1mm钝体尺寸较小时,速度从0.4m/s增加到0.48m/s,一个火焰根部向下游移动4.5mm;当D=8mm钝体为中间尺寸时,来流速度从1m/s增加到5m/s,两个火焰根部首先向下游移动7mm,再向上游移动3.7mm;当D=32mm钝体尺寸较大时,来流速度从5m/s增加到25m/s,两个火焰根部均向上游移动2mm。
In order to further understand the detailed mechanism of flame stabilization, a bluff body is used as a research model of flame stabilization mechanism, and the influence of flame root flow field characteristics on flame stability is analyzed in detail. The reaction flow fields of V-shaped bluff bodies with different sizes in two-dimensional channels at different inlet velocities were studied. The root characteristics of premixed kerosene flame were analyzed. Equivalent ratio of imported kerosene and air Φ = 0.6, the inlet temperature of 300K, the ambient pressure of 0.1MPa. The results show that when the bluff bodies are small size, middle size and large size respectively, the root characteristics of the flame after the bluff body, the characteristics of the recirculation zone and the root position of the flame vary with the inlet velocity varies. When the size of D = 1mm bluff body is small, the velocity increases from 0.4m / s to 0.48m / s and the root of a flame moves 4.5mm downstream. When D = 8mm blunt body is middle size, the velocity of flow from 1m / s When the size of D = 32mm bluff body is larger, the flow velocity increases from 5m / s to 25m / s, and the two flames are increased to 5m / s. Roots are moved 2mm upstream.