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Surge margin optimization of centrifugal compressors using a new objective function based on local flow parameters

Ratz, Johannes and Leichtfuss, Sebastian and Beck, Maximilian and Schiffer, Heinz-Peter and Fröhlig, Friedrich (2019):
Surge margin optimization of centrifugal compressors using a new objective function based on local flow parameters.
In: 13th European Turbomachinery Conference, Lausanne, Switzerland, April 8-12, 2019, [Online-Edition: http://www.euroturbo.eu/publications/proceedings-papers/etc2...],
[Conference or Workshop Item]

Abstract

Nowadays, 3D-CFD design optimization of centrifugal compressors in terms of surge margin is one major unresolved issue. On that account, this paper introduces a new kind of objective function. The objective function is based on local flow parameters present at the design point of the centrifugal compressor. A centrifugal compressor with vaned diffuser is considered to demonstrate the performance of this approach. By means of a variation of the beta angle distribution of impeller and diffuser blade, 73 design variations are generated and several local flow parameters are evaluated. Finally, the most promising flow parameter is transferred into an objective function and an optimization is carried out. It is shown that the new approach deliver similar results as a comparable optimization with a classic objective function using two operating points for surge margin estimation, but with less computational effort since no second operating point near surge needs to be considered.

Item Type: Conference or Workshop Item
Erschienen: 2019
Creators: Ratz, Johannes and Leichtfuss, Sebastian and Beck, Maximilian and Schiffer, Heinz-Peter and Fröhlig, Friedrich
Title: Surge margin optimization of centrifugal compressors using a new objective function based on local flow parameters
Language: English
Abstract:

Nowadays, 3D-CFD design optimization of centrifugal compressors in terms of surge margin is one major unresolved issue. On that account, this paper introduces a new kind of objective function. The objective function is based on local flow parameters present at the design point of the centrifugal compressor. A centrifugal compressor with vaned diffuser is considered to demonstrate the performance of this approach. By means of a variation of the beta angle distribution of impeller and diffuser blade, 73 design variations are generated and several local flow parameters are evaluated. Finally, the most promising flow parameter is transferred into an objective function and an optimization is carried out. It is shown that the new approach deliver similar results as a comparable optimization with a classic objective function using two operating points for surge margin estimation, but with less computational effort since no second operating point near surge needs to be considered.

Divisions: 16 Department of Mechanical Engineering
16 Department of Mechanical Engineering > Institute of Gas Turbines and Aerospace Propulsion (GLR)
Event Title: 13th European Turbomachinery Conference
Event Location: Lausanne, Switzerland
Event Dates: April 8-12, 2019
Date Deposited: 15 Feb 2019 14:16
Official URL: http://www.euroturbo.eu/publications/proceedings-papers/etc2...
Identification Number: ETC2019-212
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