An optimization has been performed on a well-proven radial compressor design known as the SRV4 impeller (the Krain impeller), which has been extensively tested in the past, using the autoopti tool developed at DLR's Institute of Propulsion Technology. This tool has shown its capability in several tasks, mainly for axial compressor and fan design as well as for turbine design. The optimization package autoopti was applied to the redesign and optimization of a radial compressor stage with a vaneless diffusor. This optimization was performed for the SRV4 compressor geometry without fillets using a relatively coarse structured mesh in combination with wall functions. The impeller geometry deduced by the optimization had to be slightly modified due to manufacturing constraints. In order to filter out the improvements of the new so-called SRV5 radial compressor design, two work packages were conducted: The first one was the manufacturing of the new impeller and its installation on a test rig to investigate the complex flow inside the machine. The aim was, first of all, the evaluation of a classical performance map and the efficiency chart achieved by the new compressor design. The efficiencies realized in the performance chart were enhanced by nearly 1.5%. A 5% higher maximum mass flow rate was measured in agreement with the Reynolds-averaged Navier–Stokes (RANS) simulations during the design process. The second work package comprises the computational fluid dynamics (CFD) analysis. The numerical investigations were conducted with the exact geometries of both the baseline SRV4 as well as the optimized SRV5 impeller including the exact fillet geometries. To enhance the prediction accuracy of pressure ratio and impeller efficiency, the geometries were discretized by high-resolution meshes of approximately 5 × 106 cells. For the blade walls as well as for the hub region, the mesh resolution allows a low-Reynolds approach in order to get high-quality results. The comparison of the numerical predictions and the experimental results shows a very good agreement and confirms the improvement of the compressor performance using the optimization tool autoopti.
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October 2017
Research-Article
Experimental and Numerical Verification of an Optimization of a Fast Rotating High-Performance Radial Compressor Impeller
M. Elfert,
M. Elfert
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
e-mail: martin.elfert@dlr.de
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
e-mail: martin.elfert@dlr.de
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A. Weber,
A. Weber
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
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D. Wittrock,
D. Wittrock
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
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A. Peters,
A. Peters
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
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C. Voss,
C. Voss
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
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E. Nicke
E. Nicke
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
Search for other works by this author on:
M. Elfert
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
e-mail: martin.elfert@dlr.de
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
e-mail: martin.elfert@dlr.de
A. Weber
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
D. Wittrock
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
A. Peters
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
C. Voss
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
E. Nicke
Institute of Propulsion Technology,
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
German Aerospace Center DLR,
Linder Hoehe,
Cologne 51147, Germany
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received January 24, 2017; final manuscript received February 22, 2017; published online May 9, 2017. Editor: Kenneth Hall.
J. Turbomach. Oct 2017, 139(10): 101007 (9 pages)
Published Online: May 9, 2017
Article history
Received:
January 24, 2017
Revised:
February 22, 2017
Citation
Elfert, M., Weber, A., Wittrock, D., Peters, A., Voss, C., and Nicke, E. (May 9, 2017). "Experimental and Numerical Verification of an Optimization of a Fast Rotating High-Performance Radial Compressor Impeller." ASME. J. Turbomach. October 2017; 139(10): 101007. https://doi.org/10.1115/1.4036357
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