武汉理工大学汽车工程学院
TK464
国家自然科学基金项目（面上项目，重点项目，重大项目）
School of Automotive Engineering, Wuhan University of Technology
The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
基于CHEMKIN软件，建立均质压燃（homogeneous charge compression ignition, HCCI）内燃机仿真模型，分析研究了掺氢比(α)、进气温度、当量比(φ)等各个参数对内燃机燃烧性能的影响，主要是对内燃机缸内温度、压力以及放热率和NO排放的影响。结果表明，缸内温度、压力和放热率随着α和进气温度的增大而增大，着火时刻提前；φ达到1附近时，缸内温度、压力和放热率峰值达到最大，随着φ的降低，着火时刻提前；缸内NO的生成量受α的影响较小，缸内NO摩尔分数峰值随着α的增加而升高；随着缸内燃烧的结束，NO的排放量都大幅度降低；α从0增加到0.2，NO的主要基元反应种类不变，总反应速率提高，且缸内的NO主要来自于HNO，NH则主要起到消耗NO的作用。为未来氨氢HCCI发动机燃烧及排放性能的改善提供了可行性研究。
A simulation model of the homogeneous charge compression ignition (HCCI) internal combustion engine was created using the CHEMKIN software to analyze and study the effects of various parameters, such as hydrogen doping ratio (α), inlet temperature, and equivalence ratio (φ), on the combustion performance of the internal combustion engine, focusing on the internal combustion engine in-cylinder temperature and pressure, as well as the exothermic rate and NO emission. The results reveal that when α and inlet temperature increase, so do the in-cylinder temperature, pressure, and exothermic rate, and the ignition moment advances; When φ is 1, the peak values of in-cylinder temperature, pressure, and exothermic rate are at their maximum, and the ignition moment advances with the decrease of φ; the generation of in-cylinder NO is less affected by α, and the peak value of the in-cylinder NO mole fraction rises with the increase of α; and the NO emission is greatly reduced with the end of in-cylinder combustion. The increase in α from 0 to 0.2 considerably reduces NO emission, although the main primordial reaction species of NO remains unchanged, the total reaction rate increases, and the NO in the cylinder primarily comes from HNO, while NH primarily consumes NO. A feasibility study is provided for the improvement of combustion and emission performance of future ammonia-hydrogen HCCI engines.
