微型多级压缩机充气系统的热力学模型及规律探究

The micro multi-stage compressor charging system has small size, light mass, and high output pressure, and can be widely used in various scenarios. Previous studies have predominantly focused on numerical models of single-stage compressors or single gas bottles. In this work, based on multidisciplinary theories including thermodynamics, fluid mechanics, heat transfer, material mechanics, and compressor principles, a novel thermodynamic model of the multi-stage reciprocating compressor filling system is proposed. This model integrates the components of “cylinders-inter-stage flow channels-gas storage bottle” and is capable of predicting and analyzing the full dynamic working process of the compressor as well as the system charging time. The established model can simulate the transient pressurization and charging process of the multi-stage compressor charging system, as well as the dynamic working characteristics of the cylinder, valve, flow channel, and gas storage bottle. The analysis focuses on several factors that may affect the filling time of the system. The results show that in-cylinder heat transfer and intercooling have a small impact on filling time but affect compressor efficiency. The inlet parameters of the compressor also impact filling time, with inlet pressure having the greatest effect. Leakage significantly affect both filling time and compressor efficiency.