Comparison of Models to Predict Low Engine Order Excitation in a High Pressure Turbine Stage
Jöcker, M. and Kessar, A. and Fransson, T. and Kahl, G. and Rehder, H.-J. (2003) Comparison of Models to Predict Low Engine Order Excitation in a High Pressure Turbine Stage. 10th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity in Turbomachines, Durham NC, USA, Sept. 7-11 2003, Durham, NC USA.
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The paper compares three numerical strategies to predict the aerodynamic rotor excitation sources of "Low Engine Order" (LEO) in a high-pressure turbine stage. Main focus is laid on methods to compute the stator exit flow. The aim is to evaluate computationally cheap approaches to avoid modelling the whole circumference of the stator. A single passage viscous strategy, a single passage inviscid linear blade movement strategy and a viscous multi passage sector strategy are compared and evaluated. The assessment of the prediction quality is made by comparison of the computed stator exit flow to experimental data. The main result is that only the global behaviour of the stator exit flow is estimated right, both level and amplitude of Mach number and pressure are computed with poor agreement to experiments. Future evaluations of the resulting rotor excitation pressure are needed to estimate the level of necessary agreement to give acceptable predictions of the low engine order forced response.
|Document Type:||Conference or Workshop Item (Paper)|
|Title:||Comparison of Models to Predict Low Engine Order Excitation in a High Pressure Turbine Stage|
|Keywords:||Low Engine Order (LEO) excitation, high pressure turbine stage, throat variation, stator exit flow field, comparison of numerical and experimental results, numerical strategies for LEO excitation prediction|
|Event Title:||10th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity in Turbomachines, Durham NC, USA, Sept. 7-11 2003|
|Event Location:||Durham, NC USA|
|Event Type:||international Conference|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L TT - Triebwerkstechnologien|
|DLR - Research theme (Project):||L - Turbine Technologies|
|Institutes and Institutions:||Institute of Propulsion Technology|
|Deposited By:||elib DLR-Beauftragter|
|Deposited On:||16 Sep 2005|
|Last Modified:||06 Jan 2010 13:23|
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