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为了提高内燃机燃用掺氢天然气的燃烧质量,提高车辆的动力性和排放性,在不同掺氢比下,利用定容燃烧弹高速纹影装置所得到的球形火焰纹影图像,结合球形火焰扩散理论,分析燃、空当量比对掺氢天然气预混燃烧特性的影响规律。结果表明:高掺氢比下,高当量比使得未拉伸层流燃烧速率出现峰值,高当量比可提高火焰燃烧速率;高掺氢比使得火焰不稳定性增强,高当量比可抑制火焰的不稳定性,增强火焰的稳定性趋势;当量比存在一个临界值Φ=1.0,燃烧压力最大,达到最大燃烧压力所需的时间最短,且高掺氢比时最大燃烧压力较大。
In order to improve the combustion quality of natural gas blended with natural gas and improve the dynamic and emission properties of vehicles, a spherical flame shadow image obtained by a high-speed shadowing device of a constant volume combustion bomb at different hydrogen mixing ratios was used, Theory, analysis of combustion, air equivalent ratio of hydrogen-doped natural gas premixed combustion characteristics of the law. The results show that the high equivalence ratio makes the combustion rate of the unstretched laminar flow peak at high hydrogen ratio, and the high equivalence ratio can increase the combustion rate of the flame. The high hydrogen mixing ratio increases the flame instability and the high equivalent ratio can restrain the flame Instability and enhance the stability of the flame. When the equivalent ratio exists a critical value Φ = 1.0, the maximum combustion pressure, the shortest time to reach the maximum combustion pressure, and the maximum combustion pressure at the high hydrogen mixing ratio.