环形串联直缸发动机配气系统设计

环形串联直缸发动机具有功率密度高、惯性力小等诸多优点,但其运行时气缸转子始终绕输出轴周向转动,使得传统发动机静态的配气方法不再适用。因此,研究设计一种能够满足该型发动机进排气需求的新型配气系统意义重大。针对该型发动机独特的环形串联结构和差速运动特性,研究了各转子气缸的容积变化规律,分析了各转子气缸进排气相位与转子转角之间的关系,创新设计了一种基于气道复用的动态位置配气系统。根据二冲程发动机配气方案设计加工了配气系统零部件,并通过高压气动实验完成了对该型发动机的动态进排气过程。实验结果表明,当给定外加驱动气压0.25 MPa时,发动机能够以约200 r/min的速度稳定运转,有效验证了该配气系统的可行性。

Gas distribution system design for annular connecting straight cylinder engine

The annular connecting straight cylinder engine has many advantages such as high power density, low inertia force and so on. However, the cylinder rotors always rotate along the circumferential direction of the output shaft during operation, which makes the traditional static gas distribution method no longer applicable. Therefore, it is of great significance to research and design a new type of gas distribution system that meets the intake and exhaust requirements of this type of engine. In view of the unique annular connecting structure and differential velocity motion characteristic of the engine, the volume change law of each rotor cylinder was analyzed, and the relationship between the intake and exhaust phases of each rotor cylinder and the rotor rotation angle was studied. On this basis, an innovative dynamic position gas distribution system with airway reuse feature was designed. According to the gas distribution scheme of two-stroke engine, the parts of the gas distribution system were designed and processed, and the dynamic intake and exhaust process was completed through high-pressure pneumatic test. The experimental results show that the engine can run stably at 200 r/min when the driving air pressure is 0.25 MPa, which effectively verifies the feasibility of the gas distribution system.