3 传热模型 发动机的传热一般与热的扩散、对流、压力功、燃烧和辐射热等因素有关,除辐射之外其它取决于能量。但是由于上述因素的偶合关系十分复杂,以及解能量方程缺乏足够的资料,使发动机传热模型的建立增加许多困难。虽然发动机的传热模型在60年前就开始建立了,但没有得到令人满意的结果。 分析缸内传热有许多方法,其中包括球型热力学模型(单区)、多区热力学模型(1个以上区域)、一维数值分析流体力学模型、多 3 heat transfer model Engine heat transfer and thermal diffusion, convection, pressure work, combustion and radiant heat and other factors, with the exception of the radiation depends on the energy. However, due to the complexity of the coupling of the above factors and the lack of sufficient information for solving the energy equation, the establishment of an engine heat transfer model adds a lot of difficulties. Although the heat transfer model of the engine started 60 years ago, satisfactory results have not been obtained. There are many methods to analyze the heat transfer in the cylinder, including the spherical thermodynamic model (single zone), the multi-zone thermodynamic model (more than one zone), the one-dimensional numerical analysis hydrodynamic model