CAJ | 학술논문

为提高天然气发动机的动力性和燃料经济性，对天然气发动机的点火提前角进行了优化研究。利用 GT-Power 软件搭建了天然气发动机的仿真模型，通过理论分析与数值模拟相结合的方法，分析了点火提前角对天然气发动机缸内燃烧压力和燃烧温度、压力升高率、燃烧放热率、转矩及燃气消耗率的影响。在此基础上，利用 DOE (design of experiments)模块，针对增压天然气发动机节气门全开、空燃比为22~25的工况，以转速和点火提前角为独立变量、以输出转矩为相关变量、以缸内燃烧压力峰值出现的位置及压力升高率限值为约束条件，进行了点火提前角的优化计算，得到了最佳点火提前角的三维 MAP 图。
위제고천연기발동궤적동력성화연료경제성，대천연기발동궤적점화제전각진행료우화연구。이용 GT-Power 연건탑건료천연기발동궤적방진모형，통과이론분석여수치모의상결합적방법，분석료점화제전각대천연기발동궤항내연소압력화연소온도、압력승고솔、연소방열솔、전구급연기소모솔적영향。재차기출상，이용 DOE (design of experiments)모괴，침대증압천연기발동궤절기문전개、공연비위22~25적공황，이전속화점화제전각위독립변량、이수출전구위상관변량、이항내연소압력봉치출현적위치급압력승고솔한치위약속조건，진행료점화제전각적우화계산，득도료최가점화제전각적삼유 MAP 도。
To improve the power performance and the fuel economy of a natural gas engine, the spark advance angle of the natural gas engine was optimized in this paper. A simulation model of the natural gas engine was developed based on GT-Power software. Through the theoretical analysis and the numerical simulation, the influences of the spark advance angle on in-cylinder pressure, in-cylinder temperature, rate of pressure rise, heat release rate, torque and brake specific fuel consumption were analyzed. Based on analysis, the spark advance angle of the supercharged natural gas engine was optimized by using DOE (design of experiments) and the map of the optimal spark advance angle was obtained under the conditions of full load and the air-fuel ratio of 22 - 25, with the engine spark advance angle chosen as independent variables, the output torque chosen as the correlative variable, and appearance time of peak value of in-cylinder pressure and the rate of pressure rise chosen as constraint conditions.