Research on expansion ratio of air power engine system

To increase the energy utilization rate of compressed air, the expansion ration is optimized based on single-staged compressed air power system by building mathematical method with the basic thermodynamic theory. Two-staged compressed air power system mathematical model is built on the basis of research on single-staged compressed air power system. Exergy analysis on air power system is researched on different expansion ratio in 10 MPa pressure and 300K temperature as input condition. Research results indicate two-staged compressed air power system expander is better than single-stage system. Results also show that the first stage expansion ratio is larger impact than the second expansion in two-staged expansion work. The work is foundation for designing valve train system for compressed air powered system.