Multiphase Flow Analysis in an Oil-injected Twin Screw Compressor

Basha, Nausheen; Rane, Sham; Kovačević, Ahmed

doi:10.11159/icmfht18.132

Cited by 11 publications

(4 citation statements)

References 9 publications

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“…Further to this, authors conducted investigation using CFD solver Ansys CFX to compare the inhomogeneous Euler-Euler approach, and homogeneous model. The homogeneous approach resulted in lower flow and power predictions than the Eulerian-Eulerian model [16]. However, the calculation time of the homogeneous model was shorter than non-homogeneous model.…”

Section: Introductionmentioning

confidence: 91%

Analysis of Oil-Injected Twin-Screw Compressor with Multiphase Flow Models

Basha

Kovačević

Rane

2019

Designs

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Growing demands for energy are motivating researchers to conduct in-depth analysis of positive displacement machines such as oil-injected screw compressors which are frequently used in industrial applications like refrigeration, oil and gas and air compression. The performance of these machines is strongly dependent on the oil injection. Optimisation of oil has a great energy saving potential by both increasing efficiency and reducing other impacts on the environment. Therefore, a three-dimensional, transient computational fluid dynamics study of oil injection in a twin-screw compressor is conducted in this research. This study explores pseudo single-fluid multiphase (SFM) models of VOF (Volume of Fluid) and a mixture for their capability to predict the performance of the oil-injected twin screw compressor and compare this with the experimental values. SCORGTM (Screw Compressor Rotor Grid Generator) is used to generate numerical grids for unstructured solver Fluent with the special interface developed to facilitate user defined nodal displacement (UDND). The performance predictions with both VOF and mixture models provide accurate values for power consumption and flow rates with low deviation between computational fluid dynamics (CFD) and the experiment at 6000 RPM and 7.0 bar discharge pressure. In addition, the study reflects on differences in predicting oil distribution with VOF, mixture and Eulerian-Eulerian two-fluid models. Overall, this study provides an insight into multiphase flow-modelling techniques available for oil-injected twin-screw compressors comprehensively accounting for the details of oil distribution in the compression chamber and integral compressor performance.

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Section: Introductionmentioning

confidence: 91%

Analysis of Oil-Injected Twin-Screw Compressor with Multiphase Flow Models

Basha

Kovačević

Rane

2019

Designs

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“…Our solver is based on an expansion model in an isolated single working space of the screw expander, which is derivative of the adiabatic law with the assumption of a working medium consisting of two separate phases, namely compressible gas (air) and incompressible liquid (oil). In the pure expansion phase (between injection and discharging) it can be written as (9) where is the volume of the working space changing during the expansion, is the corresponding pressure, is the inlet pressure, is the volume of the working space at the moment of closing the inlet port, is the total volume of the injected incompressible oil to the working space and is the heat capacity ratio. Detailed studies of the associated phenomena affecting the pressure in the working space (propagation of expansion waves, losses due to friction, centrifugal forces, etc.)…”

Section: Mathematical Model Of Expansion Processmentioning

confidence: 99%

“…Multiphase flow requires a further increase in computing capacity. The most common approaches for solving multiphase flow using CFD solvers are the Euler-Euler (gas and liquid are interpenetrating continuous media) and Euler-Lagrangian (gas is a continuous medium and liquid is dispersed phase) approaches [9].…”

Section: D and 3d Cfd Analysesmentioning

confidence: 99%

Experimental and numerical analysis of an oil-flooded air screw expander

et al. 2021

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This article describes the results of a project whose task is to research and develop a screw expander through the inversion of a screw compressor. The article summarizes aspects of the construction of an experimental device that works with an oil-flooded air screw expander. The expander was subjected to experimental and numerical analysis, the results of which are presented in the article. Numerical analysis to examine the expansion process is performed both on the basis of the analytical geometric description of the working chamber of the expander and on the basis of the geometry obtained from a 3D scan of a real machine. The results of experimental and numerical analysis will be used to integrate an oil-flooded screw expander into an energy unit for the use of low-potential heat, for example in ORC systems.

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“…Each grid represents a set of control points (coordinates) through which the mesh nodes has to pass during the simulation. Several examples of this approach can be found in the literature, including applications to screw machines [36][37][38][39], root machines [40,41], and scroll machines [28,31,42,43].…”

Section: Introductionmentioning

confidence: 99%

Structured Mesh Generation and Numerical Analysis of a Scroll Expander in an Open-Source Environment

et al. 2020

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The spread of the organic rankine cycle applications has driven researchers and companies to focus on the improvement of their performance. In small to medium-sized plants, the expander is the component that has typically attracted the most attention. One of the most used types of machine in this scenario is the scroll. Among the other methods, numerical analyses have been increasingly exploited for the investigation of the machine’s behaviour. Nonetheless, there are major challenges for the successful application of computational fluid dynamics (CFD) to scrolls. Specifically, the dynamic mesh treatment required to capture the movement of working chambers and the nature of the expanding fluids require special care. In this work, a mesh generator for scroll machines is presented. Given few inputs, the software described provides the mesh and the nodal positions required for the evolution of the motion in a predefined mesh motion approach. The mesh generator is developed ad hoc for the coupling with the open-source CFD suite OpenFOAM. A full analysis is then carried out on a reverse-engineered commercial machine, including the refrigerant properties calculations via CoolProp. It is demonstrated that the proposed methodology allows for a fast simulation and achieves a good agreement with respect to former analyses.

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Multiphase Flow Analysis in an Oil-injected Twin Screw Compressor

Cited by 11 publications

References 9 publications

Analysis of Oil-Injected Twin-Screw Compressor with Multiphase Flow Models

Analysis of Oil-Injected Twin-Screw Compressor with Multiphase Flow Models

Experimental and numerical analysis of an oil-flooded air screw expander

Structured Mesh Generation and Numerical Analysis of a Scroll Expander in an Open-Source Environment

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