Effect of Piston on Effective Areas of the Discharge Reed-Type Valve of Rolling-Piston Compressors

DOI: 10.18462/iir.compr.2017.0223

Sekcia: Rotary, scroll and screw compressors I. Chaired by Cesar J. Deschamps, Changqing Tian, Osami Kataoka

Stav prijatia: Príspevok prijatý

Autori

Abstrakt

Most simulation models for rolling-piston compressors adopt correlations of effective force and flow areas to characterize the valve dynamics and the mass flow rate through the discharge valve. However, the proximity between the piston and the discharge port may affect the flow through the valve and should therefore be considered in the evaluation of both effective areas. This effect is a consequence of increasing viscous friction in the compression chamber as the piston gets very close to the discharge port. Moreover, the flow exiting the narrow gap left in the compression chamber may affect recirculating flow regions in the discharge port. This paper reports a three-dimensional model developed to predict the flow and to analyze the influence of the piston on the effective flow and force areas of the discharge valve of a rolling-piston compressor. Based on the numerical results, correlations are proposed for the effective flow and force areas by considering the piston position. Results for the indicator diagram and valve dynamics shows the importance of the new approach.

Kľúčové slová

rolling-piston compressor, valve dynamics, numerical simulation.