Large eddy simulation applied to reciprocating compressors

Rovaris, João B.; Deschamps, César J.

doi:10.1590/s1678-58782006000200010

Cited by 7 publications

(4 citation statements)

References 9 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured power consumption of Case 2 was the smallest because the buffer tank was placed immediately after the cylinder, effectively attenuating the pressure pulsation. The unevenness of pressure pulsation was calculated in equation (8), where the p max , p min and p ave is the maximum, minimum and average pressure in a cycle, and was 19.5%, 16.6%, and 25.6% in the three cases, as shown in Figure 8(b). d¼ p max À p min ð Þ =p ave (8) The influence of the discharge pipeline configuration on the pressure loss, as calculated in equation (9), where h open and h close are the opening angle and closing angle in the p-h diagrams, and the opening angle of the discharge valve is summarized in Table 3.…”

Section: Effect Of the Discharge Pipelinementioning

confidence: 99%

“…The unevenness of pressure pulsation was calculated in equation (8), where the p max , p min and p ave is the maximum, minimum and average pressure in a cycle, and was 19.5%, 16.6%, and 25.6% in the three cases, as shown in Figure 8(b). d¼ p max À p min ð Þ =p ave (8) The influence of the discharge pipeline configuration on the pressure loss, as calculated in equation (9), where h open and h close are the opening angle and closing angle in the p-h diagrams, and the opening angle of the discharge valve is summarized in Table 3. The largest predicted power loss, which occurred in Case 3, was 0.0345 MPa with a deviation of À12.66%.…”

Section: Effect Of the Discharge Pipelinementioning

confidence: 99%

“…For these reasons, to obtain optimum valve performance, it is necessary to predict the characteristics associated with valve dynamics and flow-through valves. 8 Some studies have focused on the mathematical description of valve dynamics without considering the flow field inside the cylinder and valves. Costagliola 9 developed a thermodynamic model of compressors based on energy conservation, in which the motion of the valve was simplified as a mass-spring system.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Zhao

Zhou

Jia

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

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.

show abstract

Section: Effect Of the Discharge Pipelinementioning

confidence: 99%

Section: Effect Of the Discharge Pipelinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Zhao

Zhou

Jia

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

show abstract

“…First attempts of numerical simulation of turbulent flows by means of RANS k − and k − ω models were carried out under low Re numbers ( [12] and [13]). More recently, some papers presents numerical results based on LES turbulent models for low Reynolds number 2.5×10 4 [14], or RANS turbulent models for higher Reynolds numbers 1.6×10 6 [15]. Finally, two-dimensional numerical cases that were experimental validated under specific experimental apparatus, although for very low Reynolds numbers, were presented in [16].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the turbulent fluid flow through valves. Geometrical aspects influence at different positions

Rigola

Aljure

Lehmkuhl

et al. 2015

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. The aim of this paper is to carry out a group of numerical experiments over the fluid flow through a valve reed, using the CFD&HT code TermoFluids, an unstructured and parallel object-oriented CFD code for accurate and reliable solving of industrial flows. Turbulent flow and its solution is a very complex problem due to there is a non-lineal interaction between viscous and inertial effects further complicated by their rotational nature, together with the three-dimensionality inherent in these types of flow and the non-steady state solutions. In this work, different meshes, geometrical conditions and LES turbulence models (WALE, VMS, QR and SIGMA) are tested and results compared. On the other hand, the fluid flow boundary conditions are obtained by means of the numerical simulation model of hermetic reciprocating compressors tool, NEST-compressor code. The numerical results presented are based on a specific geometry, where the valve gap opening percentage is 11% of hole diameter and Reynolds numbers given by the one-dimensional model is 4.22 × 10 5 , with density meshes of approximately 8 million CVs. Geometrical aspects related with the orifice's shape and its influence on fluid flow behaviour and pressure drop are analysed in detail, furthermore, flow results for different valve openings are also studied. IntroductionThe radial outflow between two coaxial disks is technologically important for different applications (radial diffusers, air bearings, valve reeds, etc.). In all these cases the flow is quite complex, presenting a pressure gradient that may be either positive or negative depending on radial location. Furthermore, turbulent flow is often encountered, thus, turbulence models are critical on the numerical resolution of this technological relevant application.The numerical results are obtained using the three dimensional, parallel, unstructured and object oriented code TermoFluids [1] using LES models, a high Reynolds number (close to real working conditions) and turbulent inlet flow. In fact, the present paper is an updated version of previous works [3] and [4] that used extruded meshes, low Reynolds numbers and did not use low Mach models [5].Experimental ([6] and [7]) and numerical ([10] and [11]) have been performed setting a basis to understand the physics underlying in the flow. First attempts of numerical simulation of turbulent flows by means of RANS k − and k − ω models were carried out under low Re numbers ([12] and [13]). More recently, some papers presents numerical results based on LES turbulent models for low Reynolds number 2.5×10 4 [14], or RANS turbulent models for higher Reynolds numbers 1.6×10 6 [15]. Finally, two-dimensional numerical cases that were experimental validated under specific experimental apparatus, although for very low Reynolds numbers, were presented in [16].From a compressor study viewpoint the fluid flow is composed by two different physics (entrance flow through a channel and a free jet through a surface)(see fig 1a). In that sense, the present paper is ...

show abstract

Valve fault detection for single-stage reciprocating compressors

Farzaneh–Gord

Khoshnazar

2016

Journal of Natural Gas Science and Engineering

View full text Add to dashboard Cite

Large eddy simulation applied to reciprocating compressors

Abstract: Large Eddy Simulation Applied to Reciprocating CompressorsThis paper considers the application of large-eddy simulation (LES)

Cited by 7 publications

References 9 publications

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

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

Numerical analysis of the turbulent fluid flow through valves. Geometrical aspects influence at different positions

Valve fault detection for single-stage reciprocating compressors

Contact Info

Product

Resources

About