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Analytical grid generation for sliding vane machines and the numerical assessment of tip leakage flow.

Number: B2-114

Author(s) : YE F., BIANCHI G., TASSOU S. A., DENG J.

Summary

An essential step to perform Computational Fluid Dynamics (CFD) simulations in positive displacement machines is to develop algorithms for the discretization of the moving and deforming computational domain. This work presents a newly developed analytical grid generation methodology for sliding vane machines based on a user defined nodal displacement method. The proposed approach enables a broader range of sliding vane machines such as the ones with nor-circular housing and blade-offset arrangement for both single-acting and double-acting machines. A novel post-processing routine based on rotating monitoring planes was developed in ANSYS CFD-Post to track the leakage flows at the blade tip gaps. The proposed methodology has been tested on a vane expander for Organic Rankine Cycle applications and a rotary vane energy recovery device (RVERD) for seawater reverse osmosis desalination. Besides the experimental validation on the ORC test case, the volumetric efficiency with different blade tip gap size of the RVERD was eventually presented. When the blade tip clearance of the expander was between 10 and 50 μm, every 10 μm of the clearance contributed to a 6.1% increase of the filling factor. While for the RVERD with the blade tip clearance from 30 to 70 μm, every 10 μm of the clearance led to a 2.0% decrease of the volumetric efficiency.

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  • Original title: Analytical grid generation for sliding vane machines and the numerical assessment of tip leakage flow.
  • Record ID : 30028751
  • Languages: English
  • Subject: Technology
  • Source: 12th International Conference on Compressors and their Systems
  • Publication date: 2021/09
  • Document available for consultation in the library of the IIR headquarters only.

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