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Deterministic Stress Modeling for Multistage Compressor Flowfields

Stollenwerk, Stefan and Kügeler, Edmund (2013) Deterministic Stress Modeling for Multistage Compressor Flowfields. ASME Turbo Expo 2013, 03. Jun. - 07. Jun. 2013, San Antonio, Texas, USA.

PDF (GT2013-94860)


Unsteadiness is one of the main characteristics in turbomachinery flows. Local unsteady changes in static pressure must exist within a turbomachine in order for that machine to exchange energy with the fluid. The primary reason for unsteady effects lies in the interaction between moving and stationary bade rows. The industrial design process of aero-engines and gas turbines is still based on Reynolds-averaged Navier-Stokes (RANS) techniques where the coupling of blade rows is carried out by mixing-planes. However, this methodology does not cover deterministic unsteadiness in an adequate way. For standard aero-optimization, detailed unsteadiness is not essential to the designer of turbomachines but rather its effect on the time averaged solution. The time averaged deterministic unsteadiness can be expressed in terms of deterministic stresses. The paper presents two different modeling strategies for deterministic stresses that constitute an improvement of the conventional steady mixing-plane approach. Whilst one of the presented models operates with deterministic flux terms based on preliminary unsteady simulations, the other one, a novel transport model for deterministic stress, is a stand-alone approach based on empirical correlations and a wide range of numerical experiments. A 4.5 stage transonic compressor is analyzed regarding blade row interaction effects and their impact on the time averaged solution. The two models are applied to the compressor and their solutions are compared to conventional mixing-plane, time accurate and experimental data. The results for the speedline, the wake shapes, the radial distributions and the rotor blade loadings show that the deterministic stress models strongly improve the RANS solution towards the time accurate and the experimental methods.

Item URL in elib:https://elib.dlr.de/82872/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Deterministic Stress Modeling for Multistage Compressor Flowfields
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Stollenwerk, Stefanstefan.stollenwerk (at) dlr.deUNSPECIFIED
Kügeler, EdmundEdmund.Kuegeler (at) dlr.deUNSPECIFIED
Date:June 2013
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Turbomachinery, CFD, Unsteady interaction, Numerical methods, Deterministic stress
Event Title:ASME Turbo Expo 2013
Event Location:San Antonio, Texas, USA
Event Type:international Conference
Event Dates:03. Jun. - 07. Jun. 2013
HGF - Research field:Aeronautics, Space and Transport, Energy
HGF - Program:Aeronautics, Efficient Energy Conversion and Use (old)
HGF - Program Themes:Propulsion Systems (old), Power Plants (old)
DLR - Research area:Aeronautics, Energy
DLR - Program:L ER - Engine Research, E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):L - Fan and Compressor Technologies (old), E - Gasturbine (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Stollenwerk, Stefan
Deposited On:24 Jun 2013 07:58
Last Modified:31 Jul 2019 19:41

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