回热式多孔介质发动机的排放特性分析

Study on Emission Characteristics in a Regenerative Porous Medium Engine

研究了回热式多孔介质发动机的排放特性。使用Ferrenberg所提出的回热式发动机模型,其多孔介质回热器在气缸中作往复运动。用改进的KIVA-3V程序进行了二维模拟。探讨了在不同当量比和孔隙率条件下,气缸内燃烧和排放特性。结果表明,回热式多孔介质发动机在燃烧和排放方面较之常规都有明显的优势。采用低当量比能有效地降低污染物的排放,而孔隙率的影响则与当量比有关。分析证明,采用多孔介质回热器是发动机实现稀薄燃烧的一条可供选择的途径。

Emission characteristics of the regenerative porous medium engine proposed by Ferrenberg were investigated. A two-dimensional model is presented based on a modified version of the engine CFD software KIVA-3V. Combustion and emission characteristics of the engine were discussed under different equivalence ratios and porosities of the regenerator. Results show that the regenerative engine has the advantages in both combustion efficiency and pollution emissions over the conventional engines and the lean combustion can reduce emissions significantly. The effect of porosity is dependant on the equivalence ratio. The regenerative porous medium engine is an effective alternative in realizing the lean homogeneous combustion.