耦合动力学的微型发动机燃烧特性

Combustion characteristics and dynamic modeling of micro engine

为了获得微型均质充量压燃(HCCI)自由活塞发动机着火燃烧特性参数,根据自由活塞发动机的动力学特点,建立了理想状态下的数学模型,提出了单次冲击微型HCCI自由活塞发动机工作过程的模拟方法.在单次活塞冲击情况下,耦合丙烷详细化学动力学反应机理,对微型HCCI自由活塞发动机着火燃烧过程进行了变参数研究,获得了不同混合气初始条件下着火时刻变化特性以及燃烧特性变化规律.计算结果表明:初始温度、初始压力以及燃料当量比对微型HCCI自由活塞发动机着火燃烧过程有重要的影响.

In order to obtain ignition and combustion characteristic parameters of the micro Homogeneous Charge Compress Ignite（HCCI） free-piston engine,numerical model of operation process of micro HCCI free-piston engine was developed.A method was proposed to simulate the operation of single-shot micro HCCI free-piston engine based on the kinetic characteristics of free-piston engine.A method of varying the influencing parameters was used to simulate the operation of single shot process of micro HCCI free-pistonengine coupled with the detailed chemical kinetic model of propane.The change of ignition time and combustion characteristics were obtained under the conditions of different initial conditions.The computational results indicate that initial temperature,initial pressure and equivalence ratio of fuel have important influence on ignition and combustion process of micro HCCI free-piston engine.