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首页> 外文会议>International Symposium on Combustion; 20060805-11; University of Heidelberg(DE) >Effects of hydrogen addition on laminar and turbulent premixed methane and iso-octane-air flames
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Effects of hydrogen addition on laminar and turbulent premixed methane and iso-octane-air flames

机译：加氢对层流和湍流混合甲烷和异辛烷空气火焰的影响

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The effect of adding hydrogen to methane and iso-octane-air premixtures has been investigated under both laminar and turbulent conditions. Five percent by mass of hydrogen was added the to base fuel. Measurements were performed at 5 bar and the equivalence ratio was varied from the lean ignition limit to either the rich ignition or sooting/buoyancy limit. The laminar burning velocity, u_1, increased for fuel lean and stoichiometric methane/hydrogen mixtures compared with pure methane. A doubling in u_1 was observed at the lean limit. There was no increase in u_1 for φ ≥ 1.2. Laminar hydrogen/iso-octane mixtures burned faster than those of pure iso-octane-air over the whole range of equivalence ratios investigated. For both methane and iso-octane, addition of hydrogen resulted in earlier onset of laminar flame instabilities and a reduction in the Markstein length (where measurement was possible). In the case of turbulent combustion, hydrogen addition (for both fuels), resulted in an approximate doubling of turbulent burning velocity at the lean limit. As the equivalence ratio was increased, the effect of adding hydrogen reduced until, at the rich ignition (methane) or sooting/buoyant (iso-octane) limit, no change in turbulent burning velocity was measured. The increased laminar burning velocity was primarily responsible for the increased turbulent burn rate with hydrogen addition. For lean iso-octane-air mixtures hydrogen addition resulted in further enhancement of the turbulent burning velocity over and above that expected on the basis of the laminar burning velocity. This was associated with a reduction of the flames sensitivity to strain rate, a result of the molecular mobility of H_2.
机译：已经在层流和湍流条件下研究了向甲烷和异辛烷空气预混合物中添加氢的效果。将5质量％的氢添加到基础燃料中。在5巴下进行测量，并且当量比从稀燃极限到浓燃或烟ot /浮力极限变化。与纯甲烷相比，贫燃料和化学计量甲烷/氢气混合物的层流燃烧速度u_1增加。在稀薄极限处观察到u_1倍增。 φ≥1.2时，u_1没有增加。在研究的整个当量比范围内，层状氢/异辛烷混合物的燃烧速度比纯异辛烷空气燃烧快。对于甲烷和异辛烷而言，添加氢气会导致层流火焰不稳定性的更早发作，并降低Markstein长度（可能进行测量）。在湍流燃烧的情况下，氢气的添加（对于两种燃料）导致稀薄极限处的湍流燃烧速度大约翻倍。随着当量比的增加，添加氢的作用降低，直到在浓点火（甲烷）或烟ot /浮力（异辛烷）极限，测得湍流燃烧速度没有变化。层流燃烧速度的增加主要是由于添加氢气增加了湍流燃烧速度。对于稀的异辛烷-空气混合物，氢气的添加导致湍流燃烧速度进一步提高，高于基于层流燃烧速度的预期。这与火焰对应变率的敏感性降低有关，这是H_2分子迁移的结果。

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