2016年第2期
文章编号：10094687(2016)02001106
车辆与动力技术 Vehicle & Power Technology
总第142期
基于代理模型的气门大小对功率影响的研究
李兴义，黎一错，刘福水（北京理工大学机械与车辆学院，北京100081）
摘要：针对某型号高增压柴油机，利用基于代理模型的数据拟合方法，研究了不同工况下功率随气门大小变化的规律，并得到每个工况下最优功率和相应的进排气门尺寸，研究结果表明：在研究范围内，对于排气背压较低的工况，同工况下进气门增大使得功率增大，排气门增大使得功率先增大后减小；排气背压逐升高时，功率逐渐减小，最优功率点的进排气门直径比增大，对于排气背压很高的工况，进、排气门增大均会使得功率先增大后减小，
关键调：增压柴油机；进排气门；代理模型；功率
中图分类号：TK421.3
文献标识码：A
Surrogate-based Investigation in Influence of Valve Sizes
onEnginePowerOutput LI Xing-yi，
LI Yi-kai,
LIU Fu-shui
(School of Mechanical Engineering，Beijing Institute of Technology，Beijing，100081)
Abstract: By means of the data fitting method based on a surrogate model, the law of its power change with the valve size was investigated under different work conditions for a high turbocharged diesel engine. The optimal power output and its corresponding size of the intake and exhaust valve were obtained under each working condition. The results showed that, for the conditions with the lower exhaust back pressure, the power output increased with increase of the intake valve size but the increase of the exhausted valve size made the power output increase at first and then decrease. As the exhaust back pressure increased, the power output gradually decreased and the diameter ratio of the intake and exhaust valve increased at the optimal power point. Under the conditions with higher exhaust back pressure, the increase of the intake and exhaust valve size would make the power output increase at first and then decrease.
Key words: turbo charged diesel engine; intake and exhausted valve; surrogate model; power
和汽油发动机相比，柴油机具有热效率高、功率密度大等优点，因此，柴油机自发明以来应用愈广，各方面都取得了十分显著的进步．随着近几年空气不断恶化，节能减排理念深人人心，柴油机要想继续发展，必须提高热效率来提高经济性和排放性；另一方面，柴油机广泛应用的同时出现很多苛刻的应用场景，比如高原低气压燃烧，高强度高压
收稿日期：201512-16
作者简介：李兴义（1988-），男，硕士万方数据
燃烧，这些场景下功率响应会发生变化燃烧过程中，高效的进排气过程对发动机性能作用十分显著，而进排气门是进排气过程中重要的一环，因此针对增压型柴油机进排气门大小对功率影响的研究是十分必要的．因此，文中采取仿真分析与代理模型拟合相结合的方法，对单一工况以及变工况时进排气门大小与功率的关系进行研究分析[14]