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Research Papers

Experimentally Observed Unsteady Work at Inlet to and Exit From an Axial Flow Turbine Rotor

[+] Author and Article Information
Martin G. Rose

ILA, Uni-Stuttgart,
Stuttgart D-70569, Germany
e-mail: rose@ila.uni-stuttgart.de

Philipp Jenny

LEC-ETHZ,
Zurich CH-8092, Switzerland

Jochen Gier

MTU Aero Engines,
Munchen D-80995, Germany

Reza S. Abhari

LEC-ETHZ,
Zurich CH-8092, Switzerland

Contributed by the International Gas Turbine Institute of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received June 29, 2012; final manuscript received December 11, 2012; published online September 13, 2013. Editor: David Wisler.

J. Turbomach 135(6), 061017 (Sep 13, 2013) (8 pages) Paper No: TURBO-12-1095; doi: 10.1115/1.4023460 History: Received June 29, 2012; Revised December 11, 2012

World literature has introduced the aerodynamic importance of unsteadiness in turbines. In particular, the unsteady static pressure field determines the work of the machine. The unsteadiness can redistribute the total pressure in a cascade with wake interaction. It has been shown that differences in work between wake and free stream can act to rectify the wakes and boost efficiency. In this paper, fast response aerodynamic probe (FRAP) data are used to study the nature of the unsteady work in the flow at entry to and exit from a rotating turbine blade. The topic is addressed experimentally, theoretically, and computationally. It is found at both rotor inlet and exit that upstream wakes influence the unsteady work distribution. The relationship between the unsteady work in the absolute frame, the relative frame, and the momentum of the fluid circumferentially is derived and verified experimentally. Computational results (unsteady Reynolds-averaged Navier–Stokes (URANS)) are compared to the experimental results: reasonable agreement is found at rotor exit, but significant differences at rotor inlet are found. The computational fluid dynamics (CFD) has failed to capture the von Karman vortices and has dramatically lower levels of unsteady work. The experimental unsteady work distribution suggests possible effects of wake bending and vortex instability.

Copyright © 2013 by ASME
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References

Figures

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Fig. 1

Normalized static pressure from FRAP probe at rotor inlet time-averaged in the absolute frame

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Fig. 2

Normalized absolute total pressure from FRAP probe time-averaged in the absolute frame at rotor inlet

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Fig. 3

Normalized static pressure from four-hole pneumatically averaged probe at rotor inlet

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Fig. 4

Normalized static pressure time-averaged in the relative frame of reference at rotor inlet

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Fig. 5

Normalized ∂p/∂t)rel time-averaged in the absolute frame of reference at rotor inlet

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Fig. 6

Normalized ∂p/∂t)abs time-averaged in the relative frame at rotor inlet

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Fig. 7

Normalized ∂p/∂rθ time-averaged in the relative frame at rotor inlet

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Fig. 8

Normalized static pressure time-averaged in the absolute frame at rotor exit

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Fig. 9

Normalized static pressure time-averaged in the rotating frame of reference at rotor exit

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Fig. 10

Normalized relative total pressure time-averaged in the rotating frame of reference at rotor exit

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Fig. 11

Normalized ∂p/∂t)rel time-averaged in the absolute frame of reference at rotor exit

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Fig. 12

Normalized ∂p/∂t)abs time-averaged in the rotating frame of reference at rotor exit

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Fig. 13

Normalized ∂p/∂rθ time-averaged in the absolute frame at rotor exit

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Fig. 14

CFD-predicted, normalized, time-averaged static pressure in the absolute frame at rotor inlet

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Fig. 15

Normalized ∂p/∂t)rel from CFD time-averaged in the absolute frame at rotor inlet

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Fig. 16

Normalized ∂p/∂t)abs from CFD time-averaged in the rotating frame of reference at rotor exit

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