3D CFD Analysis of an Oil Injected Twin Screw Expander

Papeš, Iva; Degroote, Joris; Vierendeels, Jan

doi:10.1115/imece2013-64224

Cited by 9 publications

(3 citation statements)

References 9 publications

(9 reference statements)

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“…Based on the simulation analysis of the three-dimensional CFD model of the screw expander, Papes I [19] studied the mass flow of four types of leakage channels. Dr. Hesse et al [20] researched the heat transfer between gas and rotors and leakage flows through the clearances by CFD model of screw compressor simulation analysis.…”

Section: Computer-assisted Application In Leakage Researchmentioning

confidence: 99%

Overview of the Development and Application of the Twin Screw Expander

et al. 2020

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With the development of society, the energy crisis has become increasingly prominent, which greatly affects the sustainable development of the economy of various countries. Industrial energy consumption accounts for more than 70% of China’s total energy consumption, of which more than 50% is converted to industrial waste heat, and recyclable waste heat resources account for about 60% of the total waste heat resources, while China’s current utilization rate of industrial waste heat only reaches about 30%. The development of renewable energy and recovery of low-grade waste heat in industry is the key to solve the problem. As a type of volumetric expander with full flow expansion, the screw expander is extensively applied in the industrial waste heat recovery and geothermal energy generation industry because of its effective utilization of low enthalpy energy. Improving the performance of the screw expander as the core, the paper concludes and summarizes the research status of the leakage, rotor geometry, sealing and lubrication, processing and manufacturing, which can affect the performance of the screw expander. In addition, it also introduces the application status and potential utilization of screw expander.

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Section: Computer-assisted Application In Leakage Researchmentioning

confidence: 99%

Overview of the Development and Application of the Twin Screw Expander

et al. 2020

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“…Although this modelling gives an indication of distributed oil droplets, the effects of rotation or compression cycle are neglected and the results do not always look as expected. Eulerian-Eulerian modelling with Fluent has been explored by Papes et al, but the simulation results have not been validated experimentally nor mass balance was shown [20]. Therefore, further exploration is required with SFM models to obtain a stable and reliable approach towards modelling of oil injection within twin-screw compressors.…”

Section: Introductionmentioning

confidence: 99%

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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“…For instance, Vande Voorde and Vierendeels [6], using the same domain decomposition strategy, developed numerical procedure to produce grids through solution of a Laplace potential equation and achieve better cell orthogonality. These developed grids were applied to study the mass flow rate through leakages in an oil injected expander in ANSYS FLUENT along with User Defined Functions (UDF) for handling the grid movement with varying time step and Eulerian multiphase model [7]. However, the results from the model were not validated with the experimental data.…”

Section: Introductionmentioning

confidence: 99%

Multiphase Flow Analysis in an Oil-injected Twin Screw Compressor

Basha¹,

Rane²,

Kovačević³

2018

Proceedings of the 3rd World Congress on Momentum, Heat and Mass Transfer

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Oil injected twin screw compressors are widely used in industry for gas compression because of their high volumetric efficiency and reliability. The injected oil has a significant influence on the performance of these compressors. Only an optimum quantity of oil supply would give best performance at a specified operating condition. Therefore, it is essential to determine the distribution of oil in the working chamber and thereby the compressor's performance. Using Computational Fluid Dynamics (CFD) to solve two-phase flow in deforming domains is numerically challenging due to the complex interactions between air and oil in rotating machines. In this paper, two Eulerian-Eulerian multiphase models have been investigated. Namely, inhomogeneous and homogeneous model with free surface modelling have been investigated for their stability, oil-air distribution and accuracy of compressor performance results. Deforming rotor mesh needed for the simulation is generated by SCORG TM grid generator while two-phase transient flow is solved with ANSYS CFX solver. Results obtained from the simulation have been compared with the measured data of mass flow rate of gas, indicated power and temperatures. Inhomogeneous model predicts data closer to the experimental results and an expected distribution of oil in the rotor tip clearances. For a high mesh deformation of a working domain in twin screw compressor, the inhomogeneous approach also provides better stability of the solver, but this is at an added cost of calculation time. In future, better initialisation and solver parameters with oil droplet characterisation will be required to further improve the model.

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3D CFD Analysis of an Oil Injected Twin Screw Expander

Abstract: Small scale Organic

Cited by 9 publications

References 9 publications

Overview of the Development and Application of the Twin Screw Expander

Overview of the Development and Application of the Twin Screw Expander

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

Multiphase Flow Analysis in an Oil-injected Twin Screw Compressor

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