A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of piston on effective areas of reed-type valves of small reciprocating compressors
Most simulation models for reciprocating compressors adopt the concept of effective force and flow areas to characterize the valve dynamics and the mass flow rate through the valve. However, in the discharge process, the proximity between the piston and the cylinder head may have a significant impact on the flow field and, hence, should be taken into account in the evaluation of both effective areas. For instance, there is an additional viscous friction loss associated with the radial flow through the very narrow clearance left in the cylinder when the piston is close to the top dead center. In addition, the flow exiting the clearance may even affect the size of recirculating flow regions in the discharge port and on the valve seat. In the present study, a computational fluid dynamics model is employed to analyze the influence of the piston on the effective flow and force areas of a discharge valve of simplified geometry. Based on the results, a method is then proposed to evaluate the effective flow and force areas by considering the piston position. Results for the indicator diagram and valve dynamics obtained from the simulation of a reciprocating compressor shows the importance of the new method.
Influence of piston on effective areas of reed-type valves of small reciprocating compressors
Most simulation models for reciprocating compressors adopt the concept of effective force and flow areas to characterize the valve dynamics and the mass flow rate through the valve. However, in the discharge process, the proximity between the piston and the cylinder head may have a significant impact on the flow field and, hence, should be taken into account in the evaluation of both effective areas. For instance, there is an additional viscous friction loss associated with the radial flow through the very narrow clearance left in the cylinder when the piston is close to the top dead center. In addition, the flow exiting the clearance may even affect the size of recirculating flow regions in the discharge port and on the valve seat. In the present study, a computational fluid dynamics model is employed to analyze the influence of the piston on the effective flow and force areas of a discharge valve of simplified geometry. Based on the results, a method is then proposed to evaluate the effective flow and force areas by considering the piston position. Results for the indicator diagram and valve dynamics obtained from the simulation of a reciprocating compressor shows the importance of the new method.
Influence of piston on effective areas of reed-type valves of small reciprocating compressors
Pereira, Evandro L.L. (author) / Deschamps, Cesar J. (author)
HVAC&R Research ; 17 ; 218-230
2011-04-08
13 pages
Article (Journal)
Electronic Resource
Unknown
Failure mechanisms of reed valves in refrigeration compressors
| British Library Online Contents | 1999
RECIPROCATING & SCREW AIR COMPRESSORS
Online Contents | 1998
Same source compressors and valves
| British Library Online Contents | 2002
A Simple Approach to Thermal Performance Analysis of Small Hermetic Reciprocating Compressors
| British Library Online Contents | 2001
A Simple Approach to Thermal Performance Analysis of Small Hermetic Reciprocating Compressors
| British Library Conference Proceedings | 2001