Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor

Abstract

In this paper, characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor are investigated. A thermodynamic model is developed and validated using data from a comprehensive experimental study. This validated model is then applied to investigate effects of key parameters including condensing temperature, compressor rotational speed, super-feed pressure, part-load operation, and design parameters on the discharge pressure pulsation. The results showed that the discharge pressure pulsation was mainly due to periodic variations of mass and energy flow from the working volumes to the discharge chamber. As the condensing temperature increased or decreased from the design condition, the compressor was in either over- or undercompression leading to an increase in the amplitude of the pressure pulsation. The gas super-feed pressure could increase the pressure pulsation at condensing temperatures below the design value and reduce the pressure pulsation at condensing temperatures above the design value. The analysis also demonstrated that the pressure pulsation was lower at part-load conditions. However, the compressor rotational speed increased both the amplitude and frequency of the pressure pulsation. Theoretical analysis of design parameters indicated that a large discharge volume with a high number of lobes could lower the pressure pulsation. These analyses provide useful information for the compressor design and optimization.

Keywords

Twin-screw compressor refrigeration pressure pulsation thermodynamic model

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References

Stosic

Smith

Kovacevic

. Optimisation of screw compressors. Appl Therm Eng 2003; 23: 1177–1195.

Bianchi

Kennedy

Zaher

et al.

Numerical modeling of a two-phase twin-screw expander for Trilateral Flash Cycle applications. Int J Refrig 2018; 88: 248–259.

Koai K and Soedel W. Gas pulsation in screw compressors – part 1: determination of port flow and interpretation of periodic volume source. In: Proc. 10th international compressor engineering conference, Purdue, USA, 1990, pp.369–377.

Koai K and Soedel W. Gas pulsation in screw compressors – part 2: dynamics of discharge system and its interaction with port flow. In: Proc. 10th international compressor engineering conference, Purdue, USA, 1990, pp.378–387.

Andrews RW and Jones JD. Noise source identification in semi-hermetic twin screw compressors. In: Proc. 10th international compressor engineering conference, Purdue, USA, 1990, pp.825–834.

Tanttari J. On twin-screw compressor gas pulsation noise. In: Proc. 29th international congress and exhibition on noise control engineering, France, 2000.

Sangfors B. Computer simulation of gas-flow noise from twin-screw compressors. In: International conference on compressor and their systems, London, 1999, pp.707–716.

Sangfors B. Modeling, measurement and analysis of gas-flow generated noise from twin screw compressors. In: Proc. 15th international compressor engineering conference, Purdue, USA, 2000, pp.971–978.

Gavric L and Badie-Cassagnet A. Measurement of gas pulsations in discharge and suction lines of refrigerant compressors. In: Proc. 15th international compressor engineering conference, Purdue, USA, 2000, pp.627–634.

10.

Xing

Peng

et al.

Simulation of discharge pressure pulsation within twin screw compressors. Proc IMechE, Part A: J Power and Energy 2004; 218: 257–264.

11.

Mujic E, Kovacevic A, Stosic N, et al. The influence of the discharge port shape on screw compressor performance and gas pulsation. In: Proc. 19th international compressor engineering conference, Purdue, USA, 2008.

12.

Mujic

Kovacevic

Stosic

et al.

The influence of port shape on gas pulsation in a screw compressor discharge chamber. Proc IMechE, Part E: J Process Mechanical Engineering 2008; 222: 211–223.

13.

Xing

Chen

et al.

Performance investigation of a pressure pulsation dampener applied in the discharge chamber of a twin screw refrigeration compressor. Int J Refrig 2018; 85: 70–84.

14.

Srinivas

Padmanabhan

. Computationally efficient model for refrigeration compressor gas dynamics. Int J Refrig 2002; 25: 1083–1092.

15.

Min

. Pressure calculation in a compressor cylinder by a modified new Helmholtz modelling. J Sound Vib 2001; 243: 775–796.

16.

Jeong

Chung

Akbar

et al.

Numerical analysis on various models of pressure snubbers in the hydrogen gas compressing system. J Mech Sci Technol 2008; 22: 761–769.

17.

Hayashi

Kaneko

. Pressure pulsations in piping system excited by a centrifugal turbomachinery taking the damping characteristics into consideration. J Fluids Struct 2014; 45: 216–234.

18.

Papes

Degroote

Vierendeels

. Development of a thermodynamic low order model for a twin screw expander with emphasis on pulsations in the inlet pipe. Appl Therm Eng 2016; 103: 909–919.

19.

Xing Z, Peng X and Shu P. Development and application of a software package for the design of twin screw compressor. In: Proc. 11th international compressor engineering conference, Purdue, USA, 2000.

20.

Xing

et al.

Effects of lubricating oil on the performance of a semi-hermetic twin-screw compressor. Appl Therm Eng 2017; 112: 340–351.

21.

Lin Z. Gas-liquid two-phase flow and boiling heat transfer. Xi’an: Xi’an Jiaotong University Press, pp.176–182.

22.

Chen

Xing

Shen

et al.

Thermal modeling for the motor in semi-hermetic screw refrigeration compressors under part-load conditions. Int J Refrig 2013; 36: 1874–1882.

23.

Mujic E. A numerical and experimental investigation of pulsation induced noise in screw compressors. Diss. City University, 2009.

24.

Xing

Shu

. Theoretical and experimental study on indicator diagram of twin screw refrigeration compressor. Int J Refrig 2004; 27: 331–338.

25.

Chen

Xing

Tang

et al.

Theoretical and experimental investigation on the performance of screw refrigeration compressor under part-load conditions. Int J Refrig 2011; 34: 1141–1150.