The sealing characteristics of an annular power cylinder based on the Twin-rotor piston engine are studied, which provides a theoretical foundation for the sealing design of a new high-power density piston engine. In this paper, the basis thermodynamic realization process of an annular power cylinder is presented. The Runge Kutta equation is used to establish the coupled leakage model of adjacent working chambers under annular piston seal. And the sealing performance of the annular power cylinder is analyzed in detail. Moreover, the influence of rotor speed and compression ratio on the sealing characteristics and leakage is studied. Finally, some tests are carried out to verify the sealing principle and simulation results, which verifies the theoretical basis of simulation analysis. Results show that there are double pressure peaks in the leakage chamber between two working chambers, which is beneficial to reduce the leakage rate. Besides, increasing the speed and decreasing the compression ratio can help to reduce gas leakage. Furthermore, the effects of speed variation on the leakage are only significant when rotating at low speed. Changing the compression ratio has a greater effect on the slope of the leakage curve at a low compression ratio, and the lower the compression ratio, the better the sealing effect.

研究了基于双转子活塞发动机的环形动力缸的密封特性，为新型高功率密度活塞发动机的密封设计提供了理论基础。本文介绍了环形动力缸的基本热力学实现过程。利用Runge Kutta方程建立环形活塞密封下相邻工作腔的耦合泄漏模型。并对环形动力缸的密封性能进行了详细分析。此外，研究了转子速度和压缩比对密封特性和泄漏的影响。最后进行了一些试验，对密封原理和仿真结果进行了验证，验证了仿真分析的理论基础。结果表明，在两个工作腔之间的泄漏室中存在双压力峰值，有利于降低泄漏率。此外，提高速度和降低压缩比有助于减少气体泄漏。此外，速度变化对泄漏的影响仅在低速旋转时才显着。改变压缩比对低压缩比时泄漏曲线的斜率影响更大，压缩比越低，密封效果越好。