Investigation of interaction between thermodynamic processes and pressure pulsation based on transient CFD model of a reciprocating compressor

Abstract

This paper presents a transient computational fluid dynamics (CFD) model of a reciprocating compressor to study the interaction of the thermodynamic process and pressure pulsation. To realize the interaction between the thermodynamics and the pressure pulsation, the most difficult procedure lies in dealing with the valve motion and flow through the valve channel both precisely and effectively. Therefore, a discretization method for the flow channel of the ring valve to generate structured grids is proposed. Then, the subsequent model is embedded in the flow channel of the compressor model. User-defined functions are employed to calculate the independent velocity of each valve plate based on the real-time pressure differences across the valve plates. After verified, the influences of the discharge pipeline configuration, pressure ratio, and rotational speed were examined. The results of the numerical model agreed well with the experiment. The maximal deviation between predictions and experiments at the pressure ratio of 3 was 6.14% of indicated power. The maximum deviation increased to 7.42% at the rotational speed of 480 rpm. The results for the discharge pipeline configuration verified that the buffer tank directly following the nozzle of the compressor contributed greatly to attenuating the pressure pulsation. A fast Fourier transform analysis of pressure pulsation showed that at all speeds, the amplitudes were almost the same below the eighth harmonic, and then gradually increased for the higher harmonics.

Keywords

CFD reciprocating compressor thermodynamic process pressure pulsation valve motion

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References

Balduzzi

Tanganelli

Ferrara

, et al. Two-dimensional approach for the numerical simulation of large bore reciprocating compressors thermodynamic cycle. Appl Therm Eng 2018; 129: 490–501.

Stiaccini

Galoppi

Balduzzi

, et al. Analysis of valve-retainer orientation influence on a reciprocating compressor for natural gas vehicle refueling stations. J Natural Gas Sci Eng 2017; 38: 516–526.

Possamai

Fagotti

Application of computational fluid dynamics in reciprocating compressor design, American Society of Mechanical Engineers. Adv Energy Syst Div (Publ) AES 2001; 41: 71–78.

Negrão

COR

Erthal

Andrade

DEV

, et al. A semi-empirical model for the unsteady-state simulation of reciprocating compressors for household refrigeration applications. Appl Therm Eng 2011; 31: 1114–1124.

Wang

Xue

Feng

, et al. Experimental investigation on valve impact velocity and inclining motion of a reciprocating compressor. Appl Therm Eng 2013; 61: 149–156.

Zhang

Wang

, et al. A simulation study on the transient motion of a reciprocating compressor suction valve under complicated conditions. J Fail Anal Prev 2016; 16: 790–802.

Wang

, et al. Dynamic modeling and analysis of compressor reed valve based on movement characteristics. Appl Therm Eng 2019; 150: 522–531.

Rovaris

Deschamps

CJ.

Large eddy simulation applied to reciprocating compressors. J Braz Soc Mech Sci Eng 2006; 28: 208–215.

Costagiola

The theory of spring-loaded valves for reciprocating compressor. ASME J Appl Mech 1950; 17: 415–420.

10.

Morel T and Keribar R, Comprehensive Model of a Reciprocating Compressor Applicable to Component Design Issues. In: International Compressor Engineering Conference at Purdue, West Lafayette, USA, 1988.

11.

Matos FFS, Prata AT and Deschamps CJ. A numerical methodology for the analysis of valve dynamics. In: International compressor engineering conference at Purdue, West Lafayette, USA, 2000.

12.

Elson JP and Soedel W. A review of discharge and suction line oscillation research. In: International compressor engineering conference at Purdue, West Lafayette, USA, 1972.

13.

Matos FFS, Prata AT and Deschamps CJ. Numerical simulation of the dynamics of reed type valves. In: International compressor engineering conference at Purdue, West Lafayette, USA, 2002.

14.

Pereira ELL, Santos CJ, Deschamps CJ, et al. A simplified CFD model for simulation of the suction process of reciprocating compressors. In: International compressor engineering conference at Purdue, West Lafayette, USA, 2012.

15.

Rovaris JB, Deschamps CJ, Matos FFS, et al. A hybrid simulation methodology for reciprocating compressors IMechE. In: International conference on compressors and their systems at City University, London, UK, 2005, pp. 183–192.

16.

Dhar S, Ding H and Lacerda J. A 3-D transient CFD model of a reciprocating piston compressor with dynamic port flip valves. In: International compressor engineering conference at Purdue, West Lafayette, USA, 2016.

17.

Park

Jeong

WB.

Numerical and experimental study on the reduction of refrigerant pressure pulsation within compressor pipes. J Sound Vib 2019; 438: 506–519.

18.

Park

Bilal

Adams

DE.

Gas pulsation reductions in a multicylinder compressor suction manifold using valve-to-valve mass flow rate phase shifts. J Vib Acoust Trans ASME 2007; 129: 406–416.

19.

Cyklis

Hendla

Influence of real gas model on the simulation of pressure pulsation in the reciprocating compressor manifolds. Arch Thermodyn 2005; 26: 21–35.

20.

Chen

Xing

, et al. Investigation of characteristics of discharge pressure pulsation in a twin-screw refrigeration compressor. Proc IMechE, Part C: J Mechanical Engineering Science 2019; 233: 2206–2224.

21.

Isacco

Galoppi

Ferrari

, et al. A reciprocating compressor hybrid model with acoustic FEM characterization. Int J Refrig 2016; 63: 171–183.

22.

Sun

Zhao

Jia

, et al. Three-dimensional numerical simulation and experimental validation of flows in working chambers and inlet/outlet pockets of roots pump. Vacuum 2017; 137: 195–204.