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首页> 外文会议>Proceedings of the 2009 spring technical conference of the ASME Internal Combustion Engine Division >IGNITION IN PILOT-IGNITED NATURAL GAS LOW TEMPERATURE COMBUSTION: MULTI-ZONE MODELING AND EXPERIMENTAL RESULTS
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IGNITION IN PILOT-IGNITED NATURAL GAS LOW TEMPERATURE COMBUSTION: MULTI-ZONE MODELING AND EXPERIMENTAL RESULTS

机译：引燃天然气低温燃烧中的点火：多区域建模和实验结果

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In previous research conducted by the authors, the Advanced Low Pilot-Ignited Natural Gas (ALPING) combustion employing early injection of small (pilot) diesel sprays to ignite premixed natural gas-air mixtures was demonstrated to yield very low oxides of nitrogen (NO_x) emissions and fuel conversion efficiencies comparable to conventional diesel and dual fuel engines. In addition, it was observed that ignition of the diesel-air mixture in ALPING combustion had a profound influence on the ensuing natural gas combustion, engine performance and emissions.rnThis paper discusses experimental and predicted ignition behavior for ALPING combustion in a single-cylinder engine at a medium load (BMEP = 6 bar), engine speed of 1700 rpm, and intake manifold temperature (T_(in)) of 75℃. Two ignition models were used to simulate diesel ignition under ALPING conditions: (a) Arrhenius-type ignition models, and (b) the Shell autoignition model. To the authors' knowledge, the Shell model has previously not been implemented in a multi-zone phenomenological combustion simulation to simulate diesel ignition. The effects of pilot injection timing and T_(in) on ignition processes were analyzed from measured and predicted ignition delay trends. Experimental ignition delays showed a nonlinear trend (increasing from 11 to 51.5 degrees) in the 20°-60° BTDC injection timing range. Arrhenius-type ignition models were found to be inadequate and only yielded linear trends over the injection timing range. Even the inclusion of an equivalence ratio term in Arrhenius-type models did not render them satisfactory for the purpose of modeling ALPING ignition. The Shell model, on the other hand, predicted ignition better over the entire range of injection timings compared to the Arrhenius-type ignition delay models and also capturedrnignition delay trends at T_(in) = 95℃ and T_(in) = 105℃. Parametric studies of the Shell model showed that the parameter A_(p3), which affects chain propagation reactions, was important under medium load ALPING conditions. With all other model parameters remaining at their original values and only A_(p3) modified to 8 × 10~(11) (from its original value of 1 × 10~(13)), the Shell model predictions closely matched experimental ignition delay trends at different injection timings and T_(in).
机译：在作者先前进行的研究中，先进的低先导点燃天然气（ALPING）燃烧使用早期注入的小型（先导）柴油喷雾剂来点燃预混合的天然气-空气混合物，可产生非常低的氮氧化物（NO_x）。排放和燃料转换效率可与常规柴油和双燃料发动机媲美。此外，还观察到ALPING燃烧中柴油空气混合物的点火对随之而来的天然气燃烧，发动机性能和排放产生了深远的影响.rn本文讨论了单缸发动机ALPING燃烧的实验和预测点火行为在中等负载（BMEP = 6 bar），发动机转速为1700 rpm和进气歧管温度（T_（in））为75℃的情况下。使用两种点火模型来模拟在ALPING条件下的柴油点火：（a）阿伦尼乌斯（Arrhenius）型点火模型，以及（b）壳牌自燃模型。据作者所知，以前没有在模拟柴油机点火的多区域现象燃烧模拟中实现Shell模型。从实测和预测的点火延迟趋势分析了引燃正时和T_（in）对点火过程的影响。实验点火延迟在20°-60°BTDC喷射正时范围内显示出非线性趋势（从11度增加到51.5度）。发现Arrhenius型点火模型不充分，只能在喷射正时范围内产生线性趋势。即使在Arrhenius型模型中包含一个当量比项，也不能令人满意地为ALPING点火建模。另一方面，与Arrhenius型点火延迟模型相比，Shell模型在整个喷射正时范围内都能更好地预测点火，并且还捕获了T_（in）= 95℃和T_（in）= 105℃时的点火延迟趋势。 Shell模型的参数研究表明，影响链传播反应的参数A_（p3）在中等负载ALPING条件下非常重要。在所有其他模型参数保持原始值的情况下，仅将A_（p3）修改为8×10〜（11）（从其原始值1×10〜（13）），Shell模型的预测与实验点火延迟趋势紧密匹配在不同的喷射定时和T_（in）。

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