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Experimental and Numerical Verification of an Optimization of a Fast Rotating High- Performance Radial Compressor Impeller

Elfert, Martin and Weber, Anton and Wittrock, David and Peters, Andreas and Voss, Christian and Nicke, Eberhard (2017) Experimental and Numerical Verification of an Optimization of a Fast Rotating High- Performance Radial Compressor Impeller. ASME Journal of Turbomachinery, 139 (10), pp. 101007-1. American Society of Mechanical Engineers (ASME). DOI: 10.1115/1.4036357 ISSN 0889-504X

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Abstract

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.

Item URL in elib:https://elib.dlr.de/112368/
Document Type:Article
Title:Experimental and Numerical Verification of an Optimization of a Fast Rotating High- Performance Radial Compressor Impeller
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Elfert, Martinmartin.elfert (at) dlr.deUNSPECIFIED
Weber, Antonanton.weber (at) dlr.deUNSPECIFIED
Wittrock, Daviddavid.wittroch (at) dlr.deUNSPECIFIED
Peters, Andreasandreas.peters (at) dlr.deUNSPECIFIED
Voss, Christianchristian.voss (at) dlr.deUNSPECIFIED
Nicke, Eberhardeberhard.nicke (at) dlr.deUNSPECIFIED
Date:9 October 2017
Journal or Publication Title:ASME Journal of Turbomachinery
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:139
DOI :10.1115/1.4036357
Page Range:pp. 101007-1
Editors:
EditorsEmail
Hall, KennethASME Journals
Publisher:American Society of Mechanical Engineers (ASME)
Series Name:Journal of Turbomachinery
ISSN:0889-504X
Status:Published
Keywords:radial compressor design, centrifugal compressor, numerical flow simulation, CFD, TRACE, numerical optimization, AutoOpti, experimental verification, compressor chart analysis
HGF - Research field:Energy
HGF - Program:Energy Efficiency, Materials and Resources
HGF - Program Themes:Efficient and Flexible Power Plants
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Gas Turbine (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Fan and Compressor
Deposited By: Elfert, Martin
Deposited On:16 May 2017 10:42
Last Modified:08 Mar 2018 18:53

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