中文摘要：

利用弹性力学理论和有限元法，对本实验室开发的CO2跨临界循环第三代滚动活塞膨胀机进行了分析，结果表明：设计工况下，滑板侧面与排气腔接触处的最大变形量为1．10μm；当滑板与滑板槽之间的单侧间隙为6μm时，二者的摩擦和泄漏综合效果最佳；滚动活塞的最大变形量约为1．78μm；考虑润滑油膜的厚度，滚动活塞的径向间隙保持在4～6μm较合适；偏心轴在主、副轴承之间的变形量大于其两侧的变形量，最大变形量为1．16μm。该文为第三代膨胀机的性能完善、新四代膨胀机的设计与加工提供理论依据。

英文摘要：

The third generation rolling piston expander of CO2 transcrifical cycle was explored by elastic mechanics theory and finite element method. The results show that the maximal deformation quantity is 1. ltma between profile of sliding vane and exhaust chamber in design conditions, and the combination properties of friction and leakage are optimal when one side gap length of sliding vane and sliding vane slot is 6μm. On the other hand, the deformation quantity of roiling piston is about 1.78μma, and the radial clearance is appropriate for value from 4 to 6μm considering the thickness of lubricant. In addition, the deformation quantity of eccentric axis between main beating and supplementary bearing is bigger than bilateral value, and the maximal deformation quantity is 1.16μm. The theoretical basis for performance optimization of the third generation expander and design of the fourth generation expander was provided in the paper.