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The Effect of Using Formaldehyde on the Performance of an HCCI Engine Fueled with Natural Gas

In this paper, the performance of a natural gas HCCI engine is studied through a thermodynamic model along with its detailed chemical kinetics. The influence of using formaldehyde as an additive on the engine characteristics is also investigated. The results show that it is possible to change the engine working limit using this additive .Furthermore, there is an optimum additive content for each operating condition, which leads to higher output work and power. It is also shown that the air/fuel mixture will ignite earlier using this additive, so it conceivable to reduce inlet mixture temperature resulting in better performance due to higher volumetric efficiency.