Numerical and Experimental Analysis of Transient Flow in Roots Blower
| Autor: | A. Leto, Christoph Bruecker, Ahmed Kovacevic, M. Ghavami, Gursharanjit Singh, S. H. Sun |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
0209 industrial biotechnology
Computer science Turbulence business.industry Internal flow TL 02 engineering and technology Mechanics Computational fluid dynamics Vortex Physics::Fluid Dynamics 020303 mechanical engineering & transports 020901 industrial engineering & automation 0203 mechanical engineering Positive displacement meter Particle image velocimetry Vector field TJ business Gas compressor |
| ISSN: | 1757-8981 |
| Popis: | The performance of rotary positive displacement machines highly depends on the operational clearances. It is widely believed that computational fluid dynamics (CFD) can help understanding internal leakage flows. Developments of grid generating tools for analysis of leakage flows by CFD in rotary positive displacement machines have not yet been fully validated. Roots blower is a good representative of positive displacement machines and as such is convenient for optical access in order to analyse internal flows. The experimental investigation of flow in optical roots blower by phase-locked PIV (Particle Image Velocimetry) performed in the Centre for Compressor Technology at City, University of London provided the velocity field suitable for validation of the simulation model. This paper shows the results of the three-dimensional CFD transient simulation model of a Roots blower with the dynamic numerical grids generated by SCORG and flow solution solved in ANSYS CFX flow solver to obtain internal flow patterns. The velocity fields obtained by simulation agree qualitatively with the experimental results and show the correct main flow features in the working chamber. There are some differences in the velocity magnitude and vortex distribution. The flow field in roots blower is highly turbulent and three-dimensional. The axial clearances should be included, and the axial grids should be refined in the simulation method. The paper outlines some directions for future simulation and experimental work. The work described in this paper is a part of the large project set to evaluate characteristics of the internal flow in rotary positive displacement machines and to characterize leakage flows |
| Databáze: | OpenAIRE |
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