Intermittent gas flow generates pressure oscillations in the twin-screw refrigeration compressor that cause serious problems such as structural vibration and noise. In order to reduce the amplitude of this pressure pulsation, a pressure pulsation dampener (PPD) applied in the discharge chamber of a twin screw refrigeration compressor was proposed based on the theory of Helmholtz resonator. A mathematical model was developed to design an optimal PPD by incorporating the R134-oil mixture sound speed model and the pressure pulsation simulation model. A comprehensive experimental study was then performed to validate the model and evaluate the effect of key parameters such as oil flow rate and cavity volume on attenuation performance of the PPD. Vibrational characteristics of the compressor equipped with and without the PPD were also measured and compared. Under the design frequency of 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:	Refereed Article
Keywords:	twin-screw compressor, refrigeration, discharge chamber, pressure pulsation dampener
Research Division:	Engineering
Research Group:	Mechanical Engineering
Research Field:	Energy Generation, Conversion and Storage Engineering
Objective Division:	Energy
Objective Group:	Energy Conservation and Efficiency
Objective Field:	Energy Conservation and Efficiency not elsewhere classified
Author:	Wang, X (Associate Professor Xiaolin Wang)
ID Code:	123577
Year Published:	2018
Deposited By:	Engineering
Deposited On:	2018-01-11
Last Modified:	2018-05-14
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