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International Journal of Rotating Machinery
Volume 2012, Article ID 564275, 13 pages
http://dx.doi.org/10.1155/2012/564275
Research Article

Reciprocating Compressor 1D Thermofluid Dynamic Simulation: Problems and Comparison with Experimental Data

1Dipartimento di Meccanica ed Energetica (DiME), UniversitĆ  Degli Studi di Napoli Federico II, 80125 Napoli, Italy
2FacoltĆ  di Ingegneria, UniversitĆ  Degli Studi di Napoli Federico II, 80125 Napoli, Italy

Received 9 February 2012; Revised 27 March 2012; Accepted 31 March 2012

Academic Editor: Ryo Amano

Copyright © 2012 A. Gimelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The authors here extend a 0D-1D thermofluid dynamic simulation approach to describe the phenomena internal to the volumetric machines, reproducing pressure waves’ propagation in the ducts. This paper reports the first analysis of these phenomena in a reciprocating compressor. The first part presents a detailed experimental analysis of an open-type reciprocating compressor equipped with internal sensors. The second part describes a 0D-1D thermofluid dynamic simulation of the compressor. Comparison of computed and measured values of discharge mass flow rate shows a good agreement between results for compression ratio š¯›½ < 5 . Then, to improve the model fitting at higher pressures, a new scheme has been developed to predict the blow-by through the ring pack volumes. This model is based on a series of volumes and links which simulate the rings’ motions inside the grooves, while the ring dynamics are imposed using data from the literature about blow-by in internal combustion engines. The validation is obtained comparing experimental and computing data of the two cylinder engine blowby. After the validation, a new comparison of mass flow rate on the compressor shows a better fitting of the curves at higher compression ratio.