多热力循环柴油机基础研究

以提高柴油机全工况下的性能为目标，开展以"低压缩比高膨胀比和高压缩比低膨胀比"为主的"柴油机多热力循环耦合与协调控制系统"的核心学术思想为指导，从包括工程热力学、传热学、流体力学、化学反应动力学、动力机械工程等学科交叉协同的角度，以可变气门控制为技术手段，以分工况的形式，采用计算流体动力学、化学反应动力学和发动机台架试验相结合的方法，解析缸内工质流动、混合、燃烧和排放生成过程，探索涡轮增压和可变气门多工况耦合下内燃机多热力循环的机理。该研究将丰富内燃机热力循环理论、提高可变气门涡轮增压内燃机的整体匹配度，为内燃机燃烧和排放优化提供理论支持。

In order to improve the overall performance of diesel engines, the research of 'Coupling Control System for Multi-Thermodynamic Cycle of Diesel Engines' is carried out, mainly based on the thermodynamic cycle of high compression ratio and low expansion ratio as well as the thermodynamic cycle of low compression ratio and high expansion ratio. According to the knowledge of thermodynamics, heat transfer and fluid mechanics, chemical reaction kinetics, dynamic mechanical engineering and so on, by means of variable valve technology, computational fluid dynamics, chemical reaction kinetics and experiment are combined to simulate in-cylinder gas flow motion and mixing process, burning and emissions generation process in different operating conditions and to explore mechanism of multi-thermodynamic cycle of diesel engines coupled with turbocharger and variable valve. Both further enriching thermodynamic cycle theory of diesel engines and improving overall performance of diesel engines will be achieved, by means of variable valve technology and turbocharger.