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为了解决传统气动发动机配气机构的密封问题,开发一种新型预喷式数控气动发动机,建立了它的热-动力学模型,模型由预喷气缸与工作气缸的热-流量方程和发动机的动力学方程组成,通过变参数动态仿真定量研究了预喷式数控气动发动机的工作过程与效率影响因素。研究结果表明:进气结束时预喷气缸的温度约为383.5 K,即预喷气缸期望控制压力是气动发动机的关键控制参数;在其他参数不变的对比工况下,设定发动机排气管电磁阀的有效流通面积分别为7.854 0×10-5、1.570 8×10-4、3.141 6×10-4m2,此时气动发动机的效率分别为0.575 80、.777 7和0.902 2,即排气管电磁阀的有效流通面积是影响气动发动机效率的关键因素。
In order to solve the sealing problem of the valve train of the traditional pneumatic engine, a new type of pre-jet numerical control pneumatic engine was developed. Its thermo-dynamic model was established. The model consisted of the heat-flow equation of the pre-injection cylinder and the working cylinder and the power of the engine Based on the dynamic equation of variable parameters, the working process and the influencing factors of the efficiency of the pre-jet NC pneumatic engine are studied quantitatively. The results show that the temperature of pre-injection cylinder is about 383.5 K at the end of intake air, that is, the expected control pressure of pre-injection cylinder is the key control parameter of aero-engine. Under the condition of other parameters unchanged, the engine exhaust pipe The effective flow area of the solenoid valve were 7.854 0 × 10-5,1.570 8 × 10-4,3.141 6 × 10-4m2, the efficiency of the aerodynamic engine at this time were 0.575 80, .777 7 and 0.902 2, exhaust The effective flow area of the solenoid valve is a key factor affecting the efficiency of the aero-engine.