CFD-based optimization of scroll compressor design and uncertainty quantification of the performance under geometrical variations

Cavazzini, Giovanna; Giacomel, Francesco; Ardizzon, Guido; Casari, Nicola; Fadiga, Ettore; Pinelli, Michele; Suman, Alessio; Montomoli, Francesco

doi:10.1016/j.energy.2020.118382

Cited by 26 publications

(11 citation statements)

References 23 publications

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“…To affect these phenomena and the consequences on the inlet mass flow rate, possible modification of the discharge port geometry needs to be considered during the scroll design. The relevance of the discharge port shape on the scroll performance is also deduced in the analysis of Cavazzini et al [29], but in their study, the root causes have not been identified.…”

Section: Discussionmentioning

confidence: 96%

“…It allows to define the complete meshing profiles (CMP) of the scroll, comprehensive of both the central and the peripheral profiles, simultaneously. This procedure was also adopted in [29] thanks to the reduced number of equations to handle in the scroll design optimization procedure. Since it allows to control the clearance volumes and the flank gaps, it perfectly fits even in this study.…”

Section: The Scroll Compressor Geometrymentioning

confidence: 99%

“…Hence, the scroll performance investigation by means of CFD allowed: (i) To analyze in more detail the inner fluid dynamics and (ii) to work on the identification of the factors affecting their performance [5]. Cavazzini et al [29] proposed, for the first time, a CFD-based optimization approach aimed at maximizing the efficiency of a scroll compressor, by the optimization of a selected number of design parameters. Their analysis highlighted the relevance of some design parameters over others.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Inner Fluid-Dynamics of Scroll Compressors and Comparison between CFD Numerical and Modelling Approaches

Cavazzini¹,

Giacomel²,

Benato³

et al. 2021

Advances in Energy Research

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Scroll compressors are widely adopted machines in both refrigeration systems and heat pumps. However, their efficiency is basically poor and constitutes the main bottleneck for improving the overall system performance. In fact, due to the complex machine fluid dynamics, scroll design is mainly based on theoretical and/or semi-empirical approaches. Designs strategies that do not guarantee an in-depth analysis of the machine behavior can be supplemented with a Computation Fluid Dynamics (CFD) approach. To this purpose, in the present work, the scroll compressor inner fluid dynamics is numerically analyzed in detail using two CFD software and two different modelling strategies for the axial gap. The analysis of the fluid evolution within the scroll wraps reveals unsteady phenomena developing during the suction and discharge phases, amplified by the axial clearance with negative impact on the main fluid flow (e.g., −13% of average mass flow rate for an axial gap of 30 µ) and on the scroll performance (e.g., +26% of average absorbed power for an axial gap of 30 µ). In terms of accuracy, the k-ε offers good performance on the estimation of average quantities but proves to be inadequate for capturing the complexity of the unsteady phenomena caused by the axial gap (e.g., −19% of the absorbed power in case of perfect tip seal). The need for Advances in Energy Research: 2 nd Edition 3 www.videleaf.com considering specific geometric details in design procedures is highlighted, and guidelines on the choice of the most suitable numerical model are provided depending on the analysis needs.

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Section: Discussionmentioning

confidence: 96%

Section: The Scroll Compressor Geometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the Inner Fluid-Dynamics of Scroll Compressors and Comparison between CFD Numerical and Modelling Approaches

Cavazzini¹,

Giacomel²,

Benato³

et al. 2021

Advances in Energy Research

View full text Add to dashboard Cite

show abstract

“…Like other limaçon machine embodiments, this new design can be used as expanders, compressors, and potentially pumps. Cavazzini et al [5] adopted topology optimization, which combines the particle swarm method with the computational fluid dynamics, to determine the geometric parameters that can maximize the machine efficiency of the scroll compressor. The authors discovered that the compressor performance is more sensitive to the variation of three parameters, which are the size of the discharge port, the number of coils, and the radius of orbiting scroll.…”

Section: Introductionmentioning

confidence: 99%

On the Design of a Class of Rotary Compressors Using Bayesian Optimization

Phung

Sultan

2021

Machines

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The optimization process of compressors is usually regarded as a ‘black-box’ problem, in which the mathematical form underlying the relationship between design parameters and the design objective is impractical and costly to be obtained. To solve the ‘black-box’ problem, Bayesian optimization has been proven as an accurate and efficient method. However, the application of such a method in the design of compressors is rarely discussed, particularly no work has been reported in terms of the positive displacement type compressor. Therefore, this paper aims to introduce the Bayesian optimization to the design of positive displacement compressors through the optimization process of the novel limaçon compressor. In this paper, a two-stage optimization process is presented, in which the first stage optimizes the geometric parameters as per design requirements and the second stage focuses on revealing an optimum setting of port geometries that improves machine performance. A numerical illustration is offered to prove the validity of the presented approach.

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“…Fadiga et al [19] proposed a special grid generation method based on the open source CFD software OpenFOAM, which can quickly generate a fluid domain grid that matches the working fluid, so that the grid can make the scroll machinery's working area match well with the fluid working medium. Cavazzini et al [20] combined CFD and PSO (particle swarm optimization) algorithms and found that the radius of gyration, the number of scroll teeth, and the size of the exhaust port all have an impact on the output characteristics of the scroll compressor. Rak et al [21] found that the Nusselt numbers calculated using CFD deviate from the values obtained by the formula due to the consideration of the influence of heat transfer and leakage on the scroll compressor in the calculation process.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis and Test Research of PEMFC Oil-Free Positive Displacement Compressor for Vehicle

2021

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In order to study the matching characteristics of the positive displacement air compressor and the PEMFC (proton exchange membrane fuel cells), air supply subsystem, the basic operating performance parameters of the scroll and single-screw air compressors were analyzed with the focus on the oil-free double-wrap scroll compressor. According to the thermodynamic model and three-dimensional unsteady-state numerical simulation, the variation of the temperature, pressure, and velocity was obtained. Besides, under the rated operating condition of the compressor, the inlet and outlet mass flow rate of the fluid in the working chamber with the orbiting angle of the crank was achieved. Based on the built test platform, the actual working process of scroll and screw compressors was analyzed. This study indicates that the volume flow can be significantly increased by improving the speed of the positive displacement compressor. Based on the experimental measurement, when the height of the scroll tooth of the scroll compressor increases by 5 mm, the volume flow of the prototype SC2 increases by 0.17 m3/min and the exhaust temperature is reduced by 13 °C at the rated speed.

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CFD-based optimization of scroll compressor design and uncertainty quantification of the performance under geometrical variations

Cited by 26 publications

References 23 publications

Analysis of the Inner Fluid-Dynamics of Scroll Compressors and Comparison between CFD Numerical and Modelling Approaches

Analysis of the Inner Fluid-Dynamics of Scroll Compressors and Comparison between CFD Numerical and Modelling Approaches

On the Design of a Class of Rotary Compressors Using Bayesian Optimization

Performance Analysis and Test Research of PEMFC Oil-Free Positive Displacement Compressor for Vehicle

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