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Research Papers

Boundary Layer Control on a Low Pressure Turbine Blade by Means of Pulsed Blowing

[+] Author and Article Information
Marion Mack

e-mail: marion.mack@unibw.de

Reinhard Niehuis

e-mail: reinhard.niehuis@unibw.de
University of the German,
Armed Forces Munich,
Institute of Jet Propulsion,
Neubiberg D-85577, Germany

Andreas Fiala

e-mail: Andreas.Fiala@mtu.de

Yavuz Guendogdu

e-mail: yavuz.guendogdu@mtu.de
MTU Aero Engines GmbH,
Dachauer Str. 665,
Munich D-80995, Germany

1Corresponding author.

Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received August 30, 2012; final manuscript received November 5, 2012; published online June 28, 2013. Editor: David Wisler.

J. Turbomach 135(5), 051023 (Jun 28, 2013) (8 pages) Paper No: TURBO-12-1182; doi: 10.1115/1.4023104 History: Received August 30, 2012; Revised November 05, 2012

The current work investigates the performance benefits of pulsed blowing with frequencies up to 10 kHz on a highly loaded low pressure turbine (LPT) blade. The influence of blowing position and frequency on the boundary layer and losses are investigated. Pressure profile distribution measurements and midspan wake traverses are used to assess the effects on the boundary layer under a wide range of Reynolds numbers from 50,000 to 200,000 at a cascade exit Mach number of 0.6 under steady as well as periodically unsteady inflow conditions. High-frequency blowing at sufficient amplitudes is achieved with the use of fluidic oscillators. The integral loss coefficient calculated from wake traverses is used to assess the optimum pressure ratio driving the fluidic oscillators. The results show that pulsed blowing with fluidic oscillators can significantly reduce the profile losses of the highly loaded LPT blade T161 with a moderate amount of air used in a wide range of Reynolds numbers under both steady and unsteady inflow conditions.

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References

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Figures

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Fig. 1

The High-Speed Cascade Wind Tunnel

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Fig. 2

The T161 cascade with fluidic oscillators

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Fig. 3

Implementation of oscillators inside the blade

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Fig. 4

Overview of blade with oscillators

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Fig. 5

Wake of T161 at ADP (Re = 200,000) with smooth surface and deactivated blowing, steady inflow

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Fig. 6

Oscillation frequencies for Re = 50,000, steady and unsteady inflow

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Fig. 7

Pressure distributions for Re = 50,000 for layout I and various R, steady inflow

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Fig. 8

Pressure distributions for Re = 200,000 and various R, layout I, steady inflow

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Fig. 9

Detail of pressure distributions for Re = 50,000 for both layouts and various R, steady inflow

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Fig. 10

Wake measurements for Re = 50,000 and various R, steady inflow

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Fig. 11

Aerodynamic turning for Re = 50,000 and various R, steady inflow

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Fig. 12

Wake measurements for Re = 90,000 and various R, steady inflow

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Fig. 13

Reduction of integral loss coefficient for various Re and R, layout I, steady inflow

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Fig. 14

Comparison of both layouts at optimum R, steady inflow

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Fig. 15

Comparison of pulsed blowing at optimum R with other boundary layer control methods, steady inflow

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Fig. 16

cp distributions for Re = 50,000 and various R, layout I, unsteady inflow

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Fig. 17

Reduction of integral loss coefficient for various Re and R, layout I, unsteady inflow

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Fig. 18

Comparison of both layouts at optimum R, unsteady inflow

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Fig. 19

Comparison of pulsed blowing at optimum R and other boundary layer control methods, unsteady inflow

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