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research-article

EXPERIMENTAL AND NUMERICAL VERIFICATION OF AN OPTIMIZATION OF A FAST ROTATING HIGH PERFORMANCE RADIAL COMPRESSOR IMPELLER

[+] Author and Article Information
Martin Elfert

German Aerospace Center DLR Institute of Propulsion Technology Linder Hoehe, 51147 Cologne, Germany
martin.elfert@dlr.de

Anton Weber

German Aerospace Center DLR Institute of Propulsion Technology Linder Hoehe, 51147 Cologne, Germany
anton.weber@dlr.de

David Wittrock

German Aerospace Center DLR Institute of Propulsion Technology Linder Hoehe, 51147 Cologne, Germany
david.wittrock@dlr.de

Andreas Peters

German Aerospace Center DLR Institute of Propulsion Technology Linder Hoehe, 51147 Cologne, Germany
andreas.peters@dlr.de

Christian Voss

German Aerospace Center DLR Institute of Propulsion Technology Linder Hoehe, 51147 Cologne, Germany
christian.voss@dlr.de

Eberhard Nicke

German Aerospace Center DLR Institute of Propulsion Technology Linder Hoehe, 51147 Cologne, Germany
Eberhard.Nicke@dlr.de

1Corresponding author.

ASME doi:10.1115/1.4036357 History: Received January 24, 2017; Revised February 22, 2017

Abstract

Outgoing from a well-proven radial compressor design which has been extensively being tested in the past known as SRV4 impeller (Krain impeller), an optimization has been performed using the AutoOpti tool developed at DLR. The optimization package AutoOpti was applied to the redesign and optimization of a radial compressor stage with a vaneless diffusor. The optimization was performed for the SRV4 compressor geometry without fillets using a coarse structured mesh in combination with wall functions. In order to filter out the improvements of the new SRV5 radial compressor design, two work packages were conducted: The first one was the rig test to evaluate the 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 RANS simulations during the design process. The second work package comprises the 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 million cells allowing 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.

Copyright (c) 2017 by ASME
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