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首页> 外文期刊>Energy Conversion & Management >Methane flame stability in a jet impinging onto a wall
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Methane flame stability in a jet impinging onto a wall

机译：射流撞击壁上的甲烷火焰稳定性

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Flame stability is analyzed for a methane flame in a jet impinging onto a wall. A wide range of equivalence ratio is considered and lean burn stability is emphasized. The effects of burner to plate distance (H/d), inlet velocity (U_(in)), inlet(U_(in)), fuel concentrations (Φ_(in)) and stagnation plate type on flame stability are discussed. The results show that a double solution region exists, that is, the flame may exhibit two different configurations in a certain range of operating conditions depending on which way the condition is approached (lean to rich or rich to lean). When the operating condition is in this region, the flame is unstable since an external disturbance may transform the flame shape from conical to flat flame or flat to conical flame. The double solution region is strongly influenced by the burner to plate separation distance and inlet velocity. Lower H/d or lower inlet velocity decreases the double solution region, i.e. the flame is relatively stable at lower H/d or lower inlet velocity. Instability in the double solution region may strongly affect the flame shapes. Therefore, the design of low Reynolds number heating devices, such as domestic gas burners, should take the double solution region into consideration, especially for those used in lean premixed flame applications.
机译：分析了撞击壁上的射流中甲烷火焰的火焰稳定性。考虑了大范围的当量比，并强调了稀燃稳定性。讨论了燃烧器到板的距离（H / d），入口速度（U_（in）），入口（U_（in）），燃料浓度（Φ_（in））和滞止板类型对火焰稳定性的影响。结果表明存在双解区域，也就是说，火焰在特定的运行条件范围内可能会呈现两种不同的配置，具体取决于接近该条件的方式（稀燃至浓燃或浓燃至稀燃）。当操作条件在该区域中时，火焰是不稳定的，因为外部干扰可能使火焰形状从圆锥形变为平直的火焰或从平面形变为圆锥形的火焰。双重溶液区域受燃烧器到板的分离距离和入口速度的强烈影响。较低的H / d或较低的入口速度会减小双重溶液区域，即火焰在较低的H / d或较低的入口速度下相对稳定。双重溶液区域的不稳定性可能会严重影响火焰的形状。因此，低雷诺数加热设备（例如家用燃气燃烧器）的设计应考虑双重解决方案区域，尤其是对于稀薄预混火焰应用中使用的解决方案区域。

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