关键词: 环形串联直缸发动机, 动态位置配气, 气口参数, 缸内压力

Abstract:  A dynamic position gas distribution system was introduced based on airway reuse for an innovative ACSCE. Combined with the differential rotation characteristics of dual rotor cylinders， a mathematical model of the dynamic position gas distribution structure and a thermodynamic model of the working processes of ACSCEs were established， and the influences of different structural parameters of the gas distribution system， including the position angle， size and shape， on in-cylinder pressures of ACSCEs were analyzed. The numerical calculation method was used to solve the thermodynamic equations， and the results show that the position angle of the intake and exhaust ports of the central valve shaft（CVS） has a greater impact on in-cylinder pressures， while the port size of CVS has a relatively small effect， and the port size of the rotary valve（RV） also has a great impact on in-cylinder pressures， while the port shape has less effect. The results of high-pressure pneumatic experiments on the engine indicate that when the intake port position angle is as 78°， the exhaust port position angle is as 30°， the intake port size is as 10 mm， the exhaust port size of CVS is as 14 mm and the port size of RV is as 6 mm， the ACSCE may be in correct gas distribution state and work stably. 

Key words: annular connecting straight cylinder engine（ACSCE）, dynamic position gas distribution, gas port parameter, in-cylinder pressure