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Abstract

Intermittent gas flow generates pressure oscillations in the twin-screw refrigeration compressorthat cause serious problems such as structural vibration and noise. In order to reducethe amplitude of this pressure pulsation, a pressure pulsation dampener (PPD) applied inthe discharge chamber of a twin screw refrigeration compressor was proposed based on thetheory of Helmholtz resonator. A mathematical model was developed to design an optimalPPD by incorporating the R134-oil mixture sound speed model and the pressure pulsationsimulation model. A comprehensive experimental study was then performed to validate themodel and evaluate the effect of key parameters such as oil flow rate and cavity volumeon attenuation performance of the PPD. Vibrational characteristics of the compressor equippedwith and without the PPD were also measured and compared. Under the design frequencyof 250 Hz, the vibrational acceleration of compressor under-chassis reduced by 36.2% to 41.1%when the compressor was fitted with the proposed PPD.

Item Type:	Article
Authors/Creators:	Wu, X and Xing, Z and Chen, W and Wang, X
Keywords:	twin-screw compressor, refrigeration, discharge chamber, pressure pulsation dampener
Journal or Publication Title:	International Journal of Refrigeration
Publisher:	Elsevier Sci Ltd
ISSN:	0140-7007
DOI / ID Number:	https://doi.org/10.1016/j.ijrefrig.2017.09.012
Copyright Information:	© 2017 Published by Elsevier Ltd.
Related URLs:	Google Scholar: Wang, X UTAS Profile: Wang, X
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