A kind of gradient thermal and environmental barrier coating (TBC-EBC) applied ininternal combustion engine is brought forward to improve its working reliability, emission behaviorand cconomical efficiency. The performance modeling for TBC-EBC is carried carried for heat transfer.thermal stress and calulytic reaction. The multi-layer plate model and multi-layer cylinder model areestablished for the simulations of heat transfer and thermal stress in the coatings. Both the theoreticalanalysis and the numerical analysis with multi-layer cylinder modek: are carried out and compared. lheanalysis results show good agreement. The reforming reaction model is also cstablished for catalylicperformance of the coatings based on kinetics choinical reaction and experiments

The thermal shock experiment is important measure to evaluate the themal shock resis-lhcrmal shock I-csis-trance of ceramic/metal gradient thermal barrier coatings Two substrate materials and four coatingschemes were adopted to make the specimens. Before and after the thermal shock experiments, themicrostructure of specimcens was obsecrvcd. The heat transfer and the associated thermal: stresses prodtuceedin the thermal. shock procedure were simulated by finitc clement softwarc ANSYS. The simulation resultshowcd that the gradient coating scheme is much hetter than layered coating schemes andd (2Crl 3 is moresuitable than ICr18Ni9ti is substrate material. The experiment, rosults demonstrated that the largethermal shock stresses; and the large thermal stress gradient are the main reaons of erack initiation and propagation The finite elemetn.simulation agree with the theormal shock experiment results.

The multi-layer ceramic/metal gradient cylinder model is useful for many cnginceringcanses. The heat transfer in the cylinder with coating inside is calculated by analytical method andfinite clement method. The thcrmal stress in a single layer gradient cylinder suffering, eventemperature and a multi-layer gladient cylinder with coating inside suffering uneven temperature isrespectively analzed finite difference method, finite element method and zonced-uniform method.The results show that finite clement method agrees well With analytical method in thc heat transferanalysis; finite difference method, Iinitc clement method and zoned-uniform method agrcc well witheach Other in the thermal stress analysis.

建立了一个燃料电池堆过气箱的维结构模型，应用计算流体的力学软件分析流场场。描述了空气箱中的典型流动，同时经讨论了影响空气箱内空气流动的主要因素。通过研究进气箱结构形状及尺寸对箱内空气流动的影响。发现来用合适的扩压型进口加流线型挡块可以使空气箱出口处空气流速地比较均匀。

质子交换膜燃料电池的水、热、气管理对其性能和寿命有非常重要的影响。计论了水、热、气管理的主要措施和它们对电池性能的影响。分析表明：对质子交换燃料电池物理机制认识的不足，是水、热、气管理水平较低的原因。应建立质子交换膜燃料电池的多尺度、多相、多物理场、动态仿真模型、模拟和优化，未提高其性能。