Wake-Wake Interactions and ITS Potential for Clocking in a Transonic High Pressure Turbine
Hummel, F. (2001) Wake-Wake Interactions and ITS Potential for Clocking in a Transonic High Pressure Turbine. In: The 46th ASME International Gas Turbine & Aeroengine Technical Congress, ASME TURBO EXPO 2001. ASME TURBO EXPO, New Orleans, 04-07. Juni 2001, New Orleans.
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Two-dimensional unsteady Navier-Stokes calculations of a transonic single stage high ressure turbine were carried out with emphasis on the flow field behind the rotor. Detailed validation of the numerical procedure with experimental data showed excellent agreement in both time-averaged and time-resolved flow quantities. The numerical time-step as well as the grid resolution allowed the prediction of the Karman vortex streets of both stator and rotor. Therefore the influence of the vorticity shed from the stator on the vortex street of the rotor is detectable. It was found that certain vortices in the rotor wake are enhanced while others are diminished by passing stator wake segments. A schematic of this process is presented. In the relative frame of reference the rotor is operating in a transonic flow field with shocks at the suction side trailing edge. These shocks interact with both rotor and stator wakes. It was found that a shock-modulation occurs in time and space due to the stator wake passing. In the absolute frame of reference behind the rotor a 50% variation in shock strength is observed according to the circumferential or clocking position. Furthermore a substantial weakening of the rotor suction side trailing edge shock in flow direction is detected in an unsteady flow simulation when compared to a steady state alculation which is caused by convection of upstream stator wake segments. The physics of the mentioned unsteady phenomena as well as their influence on design are discussed.
|Document Type:||Conference or Workshop Item (Paper)|
|Additional Information:||LIDO-Berichtsjahr=2001, monograph_id=2001-GT-0302,|
|Title:||Wake-Wake Interactions and ITS Potential for Clocking in a Transonic High Pressure Turbine|
|Journal or Publication Title:||The 46th ASME International Gas Turbine & Aeroengine Technical Congress, ASME TURBO EXPO 2001|
|Keywords:||high-pressure turbine, transonic, clocking|
|Event Title:||ASME TURBO EXPO, New Orleans, 04-07. Juni 2001|
|Event Location:||New Orleans|
|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 13:15|
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