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A theoretical account of the piston influence on effective flow and force areas of reciprocating compressor valves.

Number: pap. n. C1, 1359

Author(s) : PEREIRA E. L. L., DESCHAMPS C. J.

Summary

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 small gap left in the cylinder clearance when the piston is close to the top dead center. In addition to that, such a flow may even affect the size of recirculating flow regions in the discharge port and on the valve seat. In the present study, a CFD model is employed to analyze the influence of the piston on the effective flow and force areas of a simplified geometry of discharge valve. Based on the results, a method is then proposed to evaluate effective flow and force areas by considering the piston position.

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Pages: 7 p.

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Details

  • Original title: A theoretical account of the piston influence on effective flow and force areas of reciprocating compressor valves.
  • Record ID : 30001317
  • Languages: English
  • Source: 2010 Purdue Conferences. 20th International Compressor Engineering Conference at Purdue.
  • Publication date: 2010/07/12

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