基于Fluent-CFD软件建立了摆臂自由运动条件下的微型摆式发动机内燃烧过程三维动态网格数值模型，采用正丁烷氧化一步反应机理模拟了三种内径的燃烧室内流动与燃烧过程，考察了燃烧室内径对系统性能的影响。结果表明：增大内径可以减小燃烧室底部区域燃料残留，促进燃烧更快完成，提高燃烧室内的峰值压力和缩短峰值出现时间，有利于提高发动机的输出功、功率密度和效率。
Based on the Fluent-CFD software, a three-dimensional dynamic grid numerical model was established to simulate the combustion process of a micro internal combustion swing engine (MICSE) with a free-swinging arm. One-step reaction mechanism of n-butane oxidation was employed for numerically calculating the flow and combustion processes in the combustion chamber. The effects of three inner diameters of combustion chamber on the output performance of MICSE were compared. The results showed that increasing the inner diameter can reduce the fuel residue at the bottom of the chamber, accelerate combustion, increase the peak pressure and shorten the occurrence time of peak pressure, which is beneficial to improve the output power, power density and thermal efficiency of MICSE.
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