论文部分内容阅读
为更好地预测及分析柴油机污染物碳黑的产生特性,需要开发具有广泛应用价值的碳黑模型。该文以正庚烷作为燃料模拟物质,基于正庚烷氧化的气相反应机理,及描述固相碳黑颗粒形成物理、化学过程的详细动力学模型,对直喷式内燃机工作过程中的化学反应流进行了数值模拟计算。计算得到了柴油机燃烧室内多环芳烃质量、碳黑质量、体积分数随转角的变化曲线。在一定燃烧室壁面温度条件下,得到典型的多环芳烃质量、碳黑质量、碳黑体积分数均与测试水平相符,碳黑质量随转角变化曲线也与测试结果吻合较好。
In order to predict and analyze the generation characteristics of diesel pollutant carbon black better, it is necessary to develop a carbon black model with extensive application value. In this paper, n-heptane was used as a fuel simulant. Based on the gas-phase reaction mechanism of n-heptane oxidation and the detailed kinetic model describing the physical and chemical processes of solid-phase carbon black particles formation, the chemical reactions in the process of direct injection internal combustion engine The flow has been numerically simulated. The polycyclic aromatic hydrocarbons (PAHs), carbon black mass and volume fraction in the combustion chamber of diesel engine were calculated with the change of rotation angle. The results show that the mass of PAHs, the mass of carbon black and the volume fraction of carbon black are all consistent with the test level under certain combustion chamber wall temperature. The curve of carbon black mass with rotation angle also agrees well with the test results.