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Experimental Investigation of Turbine Leakage Flows on the 3D Flow Field and End Wall Heat Transfer

Rehder, Hans-Jürgen and Dannhauer, Axel (2006) Experimental Investigation of Turbine Leakage Flows on the 3D Flow Field and End Wall Heat Transfer. In: ASME-Paper GT2006-90173. ASME Turbo Expo 2006, 2006-05-08 - 2006-05-11, Barcelona, Spanien.

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Within a European research project the tip end wall region of LP turbine guide vanes with leakage ejection was investigated at DLR in Goettingen. For this purpose a new cascade wind tunnel with three large profiles in the test section and a contoured end wall was designed and built up, representing 50% height of a real low pressure turbine (LPT) stator and simulating the casing flow field of shrouded vanes. The effect of tip leakage flow was simulated by blowing air through a small leakage gap in the end wall just upstream of the vane leading edges. Engine relevant turbulence intensities were adjusted by an active turbulence generator mounted in the test section inlet plane. The experiments were performed with tangential and perpendicular leakage ejection and varying leakage mass flow rates up to 2%. Aerodynamic and thermodynamic measurement techniques were employed. Pressure distribution measurements provided information about the end wall and vane surface pressure field and its variation with leakage flow. Additionally streamline pattern (local shear stress directions) on the walls were detected by oil flow visualization. Downstream traverses with 5-hole pyramid type probes allow a survey of the secondary flow behavior in the cascade exit plane. The flow field in the near end wall area downstream of the leakage gap and around the vane leading edges was investigated using a 2D Particle Image Velocimetry (PIV) system. In order to determine end wall heat transfer distributions, the wall temperatures were measured by an infra-red camera system, while heat fluxes at the surfaces were generated with electric operating heating foils. It turned out from the experiments that distinct changes in the secondary flow behavior and end wall heat transfer mainly occur when the leakage mass flow rate is increased from 1% to 2%. Leakage ejection perpendicular to the main flow direction amplifies the secondary flow, in particular the horse-shoe vortex, whereas tangential leakage ejection causes a significant reduction of this vortex system. For high leakage mass flow rates the boundary layer flow at the end wall is strongly affected and seems to be highly turbulent, resulting in entirely different heat transfer distributions

Item URL in elib:https://elib.dlr.de/43736/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Experimental Investigation of Turbine Leakage Flows on the 3D Flow Field and End Wall Heat Transfer
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:11 May 2006
Journal or Publication Title:ASME-Paper GT2006-90173
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:shrouded turbine vane, tip leakage gap, leakage ejection, secondary flow field, end wall heat transfer
Event Title:ASME Turbo Expo 2006
Event Location:Barcelona, Spanien
Event Type:international Conference
Event Start Date:8 May 2006
Event End Date:11 May 2006
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E VG - Combustion and Gas Turbine Technologies (old)
DLR - Research area:Energy
DLR - Program:E VG - Combustion and Gas Turbine Technologies
DLR - Research theme (Project):E - Gasturbine (old)
Location: Göttingen
Institutes and Institutions:Institute of Propulsion Technology > Turbine
Deposited By: Klein, Stephanie
Deposited On:22 May 2006
Last Modified:24 Apr 2024 19:05

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