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首页> 外文期刊>Combustion and Flame >Counter-gradient Transport In The Combustion Of A Premixed Ch_4/air Annular Jet By Combined Piv/oh-lif
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Counter-gradient Transport In The Combustion Of A Premixed Ch_4/air Annular Jet By Combined Piv/oh-lif

机译：混合Piv / oh-lif在预混Ch_4 /空气环形射流燃烧中的反梯度运输

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摘要

A combination of PIV/OH laser induced fluorescence technique is used to measure the conditional -burned and unburned - gas velocity in a turbulent premixed CH_4/air annular bluff-body stabilized burner. By changing the equivalence ratio from lean to almost stoichiometric, the energy budget of the recirculating region anchoring the flame is altered in such a way to increasingly lift the flame away from the jet exit. The overall turbulence intensity interacting with each flame is thus systematically varied in a significant range, allowing for a parametric study of its effect on turbulent scalar transport under well controlled conditions, always well within the flamelet regime. The component of the flux normal to the average front is_found to reverse its direction, confirming the Bray number as a good indicator of gradient/counter-gradient behavior, once the actual incoming turbulence level felt locally by the flame is assumed as the proper control parameter.
机译：PIV / OH激光诱导荧光技术的组合用于测量湍流预混合CH_4 /空气环形钝体稳定燃烧器中的条件燃烧和未燃烧气体速度。通过将当量比从稀薄改变为几乎化学计量，固定火焰的再循环区域的能量收支被改变，以使火焰逐渐从喷射出口升起。因此，与每个火焰相互作用的总湍流强度在很大的范围内系统地变化，从而可以在良好控制的条件下（始终在小火焰范围内）对它对湍流标量传输的影响进行参数研究。找到垂直于平均前沿的通量分量以反转其方向，一旦将火焰局部感觉到的实际进入湍流水平假定为适当的控制参数，便确认布雷数是梯度/反梯度行为的良好指示。

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