In the present work, computational fluid dynamics approach is adopted to study the possibility of using porous media in combustion and emission in a single-cylinder four-stroke spark ignition engine. The combustion behavior inside the engine without and with application of porous media is studied. The analysis with application of PM signifies enhanced combustion behavior. The compression ratio is kept at 7. Two different types of fluid computational domains are considered, namely, without and with PM. The three-dimensional modeling, meshing and simulations of the combustion chambers are performed with the ANSYS 17.1-FLUENT software. The k – ε turbulence model, the premixed combustion model and the spark ignition model are used in the study. The parameters to be analyzed are the variation of cylinder pressure, temperature and turbulence at different crank angles. The results of the computational work without PM are validated with the experimental work, which is executed on the research engine setup operated in SI mode. The work is performed at different engine loads by varying the engine torque, viz. 6 Nm (25%), 12 Nm (50%), 18 Nm (75%) and 24 Nm (100%) along with the no-load condition. The analyses of the results indicate that the peak value of total pressure (1,986,868.99 Pa) and average value of total temperature (632.63 K) with PM at 100% load are lower than without PM (1,992,314.50 Pa and 604.81 K). The concentrations of NO X emissions are significantly reduced by the use of PM for all the loads. The percentage reductions in NO X emissions at no load, 25%, 50%, 75% and 100%, are found to be 2.5%, 11.1%, 9.4%, 9% and 2.12%, respectively.

中文翻译：

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火花点火发动机多孔介质燃烧技术的计算研究

在目前的工作中，采用计算流体动力学方法研究在单缸四冲程火花点火发动机的燃烧和排放中使用多孔介质的可能性。研究了在不使用和使用多孔介质的情况下发动机内部的燃烧行为。应用 PM 的分析表明燃烧行为增强。压缩比保持在 7。考虑了两种不同类型的流体计算域，即没有 PM 和有 PM。燃烧室的三维建模、网格划分和仿真使用 ANSYS 17.1-FLUENT 软件进行。研究中使用了 k-ε 湍流模型、预混燃烧模型和火花点火模型。要分析的参数是气缸压力的变化，不同曲柄角下的温度和湍流。没有 PM 的计算工作的结果通过在 SI 模式下运行的研究引擎设置上执行的实验工作进行验证。通过改变发动机扭矩，即在不同的发动机负载下进行工作。6 Nm (25%)、12 Nm (50%)、18 Nm (75%) 和 24 Nm (100%) 以及空载条件。结果分析表明，100%负载下有PM时的总压力峰值(1,986,868.99 Pa)和总温度平均值(632.63 K)低于无PM时(1,992,314.50 Pa和604.81 K)。通过对所有负载使用 PM，NO X 排放物的浓度显着降低。发现空载时 NO X 排放量减少 25%、50%、75% 和 100% 的百分比分别为 2.5%、11.1%、9.4%、9% 和 2.12%。