Numerical Study of Customised Mesh for Twin Screw Vacuum Pumps

Lu, Yang; Kovačević, Ahmed; Read, Matthew; Basha, Nausheen

doi:10.3390/designs3040052

Cited by 7 publications

(3 citation statements)

References 18 publications

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“…Their function is to link meshes generated in SCORG TM and the Fluent parallel multiprocessor calculation framework. This is based on the integration for sliding vane machines developed by authors [25], and has been extended to the parallel framework for twin-screw machines [26][27][28].…”

Section: Interface With Fluentmentioning

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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Section: Interface With Fluentmentioning

confidence: 99%

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

Basha

Kovačević

Rane

2019

Designs

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“…Their pivotal contribution involved generating a structured moving mesh for a spindle compressor rotor, leveraging a rack-generation approach pioneered by Stosic et al [22]. This innovative grid-generation technique paved the way for CFD simulations and accurate performance predictions of spindle pumps and compressors [23,24]. Notably, it even enabled the observation and analysis of cavitation phenomena [25,26].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Simulation Methodologies for Spindle Pumps

Borriello,

Frosina,

Lucchesi

et al. 2024

Fluids

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This research conducts a comprehensive comparative analysis of simulation methodologies for spindle pumps, with a specific focus on steady-state CFD, transient-CFD, and lumped-parameter approaches. Spindle pumps, renowned for their reliability, efficiency, and low noise emission, play a pivotal role in Thermal Management for Battery Electric Vehicles, aligning with the automotive industry’s commitment to reducing pollutants and CO2 emissions. The study is motivated by the critical need to curtail energy consumption during on-the-road operations, particularly as the automotive industry strives for enhanced efficiency. While centrifugal pumps are commonly employed for such applications, their efficiency is highly contingent on rotational speed, leading to energy wastage in real-world scenarios despite high efficiency at the design point. Consequently, the adoption of precisely designed spindle pumps for thermal management systems emerges as a viable solution to meet evolving industry needs. Recognizing the profound impact of simulation tools on the design and optimization phases for pump manufacturers, this research emphasizes the significance of fast and accurate simulation tools. Transient-CFD emerges as a powerful Tool, enabling real-time monitoring of various performance indicators, while steady-CFD, with minimal simplifications, adeptly captures pressure distribution and machine leakages. Lumped-parameter approaches, though requiring effort in simulation setup and simplifying input geometry, offer rapid computational times and comprehensive predictions, including leakages, Torque, cavitation, and pressure ripple. Breaking new ground, this paper presents, for the first time in the literature, accurate simulation models for the same reference machine using the aforementioned methodologies. The results were rigorously validated against experiments spanning a wide range of pump speeds and pressure drops. The discussion encompasses predicted flow, Torque, cavitation, and pressure ripple, offering valuable insights into the strengths and limitations of each methodology.

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“…A significant body of work has also emerged in the study of composite material flywheel rotors, where investigators have developed finite element models to study stress distribution and validate their design hypotheses [6]. Notably, the importance of rotor mesh quality has been recognized, leading to the proposition of novel techniques to enhance it and minimize numerical diffusion in screw pumps with large helix angles [7]. Other researchers have dived into the realm of composite material rotors, shedding light on their characteristics and key design considerations.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Analysis and Heat Transfer Optimization of CFRP Rotor in Screw Vacuum Pumps

Xiao¹,

Wang²,

Zhang³

et al. 2023

IJHT

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The current study aims to mitigate the prevalent problems of excessive mass and energy usage in screw vacuum pump rotors, more specifically, the carbon fiber reinforced polymer (CFRP) rotors. An innovative approach of thermodynamic analysis was introduced to assess the performance of these rotors under specific operating conditions. This was coupled with a thermal-structural analysis and heat transfer optimization to provide a comprehensive perspective on the system's thermodynamic behavior. Examination of the patterns of deformation, stress distribution, and heat transfer characteristics revealed significant insights for rotor structure optimization. Of particular note was the pivotal role of the temperature field, which was found to be an influential determinant of the rotor's deformation, stress, and heat transfer, as discerned from a comparison between static, thermal-structural coupling, and thermodynamic analyses. The optimized rotor structure, while displaying increased deformation and stress due to reduced stiffness, was confirmed to adhere to the design and assembly prerequisites for rotors. In conclusion, this thermodynamic approach contributes novel insights into lightweight design and enhancement strategies for screw rotors, with implications for various practical engineering applications.

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Numerical Study of Customised Mesh for Twin Screw Vacuum Pumps

Cited by 7 publications

References 18 publications

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

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

Comparative Analysis of Simulation Methodologies for Spindle Pumps

Thermodynamic Analysis and Heat Transfer Optimization of CFRP Rotor in Screw Vacuum Pumps

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