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Numerical simulation of catalysis combustion inside micro free-piston engine

机译：微型自由活塞发动机内催化燃烧的数值模拟

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摘要

In order to investigate the catalytic combustion characteristics concerning homogeneous charge compression ignition (HCCI) in micro power device, numerical simulations with a 3D computation model that coupled motion of free piston and fluid dynamics of methane-air mixture flow were carried out and detailed gas-phase and surface catalytic reaction mechanisms of methane-air mixture were applied to the catalytic reactions model, a series of mathematical formula are established to predict the characteristics of compression ignition condition, impacts of catalysis on temperature, pressure, work capacity and other factors were analyzed respectively. Simulation results reveal that catalytic combustion facilitates the improvement of energy conversion efficiency and extends the ignition limit of methane-air mixture obviously, the ignition timing is brought forward as well, while compression ratio decreases and ignition delay period shrinks significantly. Numerical results demonstrate that the existence of catalytic wall helped to restrain the peak combustion pressure and maximum rate of pressure rise contributing to the steadily and reliability of operation inside micro free-piston power device. (C) 2016 Elsevier Ltd. All rights reserved.
机译：为了研究微功率装置中均质充量压缩点火（HCCI）的催化燃烧特性，利用3D计算模型进行了数值模拟，该模型将自由活塞运动与甲烷-空气混合物流的流体动力学耦合在一起，并对气体进行了详细分析。将甲烷-空气混合物的相和表面催化反应机理应用于催化反应模型，建立了一系列数学公式来预测压燃条件的特征，分析了催化对温度，压力，工作能力等因素的影响。分别。仿真结果表明，催化燃烧促进了能量转换效率的提高，明显延长了甲烷-空气混合物的点火极限，提前了点火正时，压缩比降低，点火延迟时间明显缩短。数值结果表明，催化壁的存在有助于抑制峰值燃烧压力和最大升压速率，从而有助于微型自由活塞动力装置内部运行的稳定和可靠。 （C）2016 Elsevier Ltd.保留所有权利。

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