Abstract
On the basic principle of stepless capacity control system for large reciprocating compressor, the equations for the process of suction, reflux, compression, discharge and expansion of clearance gas were established. According to these equations, p-V diagrams at various situations were simulated. An experimental platform was setup and the compressor with designed stepless capacity control system run well. The simulated and experimental results show good coincidence and the indicated power of compressor decreases when using the stepless capacity control system. The effects of clearance and valve clearance Mach number on capacity and indicated power, and the relationship between capacity and indicated energy were analyzed.
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