Abstract

This paper describes the measurement and postprocessing of turbulence data. The experiments were carried out in a two-stage, two-spool transonic turbine test rig at the Institute for Thermal Turbomachinery and Machine Dynamics at the Graz University of Technology, which includes relevant purge and turbine rotor tip leakage flows. The test setup consists of a high-pressure turbine (HPT) stage, a turbine vane frame (TVF) with turning struts and splitters, and a counter-rotating low-pressure turbine (LPT) to allow engine realistic measurements. Time-resolved area traverse measurements have been performed for three different operating conditions in three measurement planes downstream of the HPT rotor, which enable the measurement of the turbulence quantities at the TVF inlet and outlet as well as the LPT outlet. The turbulence quantities are evaluated using triaxial- and single hot-film probes by means of Constant-Temperature-Anemometry, and their results were validated with five-hole probe (FHP) measurements. Ensemble- and time-averaging, as well as Fourier transforms, were applied for data reduction. It is shown how the turbulence intensity and integral length scale vary over different purge flowrates (PFR). The acquired measurement data illustrate that the interaction of the ejected purge flow with mean flow enhances the turbulent mixing in the secondary flow structures at the TVF inlet and TVF outlet, respectively. Furthermore, the flow downstream of the LPT rotor is affected by TVF and LPT rotor secondary flow structures, which are identified as high turbulence regions. These regions strongly depend on the purge flowrate. These results acquired under engine realistic rig flow conditions enable a deeper understanding of the relationship between loss and turbulence quantities and will help improve the application of computational fluid dynamics turbulence models to turbomachinery modeling.

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References

1.
Camp
,
T. R.
, and
Shin
,
H. W.
,
1995
, “
Turbulence Intensity and Length Scale Measurements in Multistage Compressors
,”
ASME J. Turbomach.
,
117
(
1
), pp.
38
46
.
2.
Xiao
,
X.
, and
Lakshminarayana
,
B.
,
2001
, “
Detailed 3D LDV Measurement of Flow Field Near End Wall Inside a Turbine Rotor
,”
37th Joint Propulsion Conference and Exhibit
,
Salt Lake City, UT
,
July 8 –11
.
3.
Behre
,
S.
,
Kluxen
,
R.
,
Jaschke
,
P.
, and
Yavuz
,
G.
,
2015
, “
Development of Turbulence Intensity and Integral Length-Scale in a 1.5 Stage Axial Flow Turbine
,”
International Gas Turbine Congress
,
Tokyo, Japan
.
4.
Porreca
,
L.
,
Hollenstein
,
M.
,
Kalfas
,
A. I.
, and
Abhari
,
R. S.
,
2007
, “
Turbulence Measurements and Analysis in a Multistage Axial Turbine
,”
J. Propul. Power
,
23
(
1
), pp.
227
234
.
5.
Merli
,
F.
,
Hafizovic
,
A.
,
Krajnc
,
N.
,
Schien
,
M.
,
Peters
,
A.
,
Heitmeir
,
F.
, and
Goettlich
,
E.
,
2024
, “
Unsteady Investigation of Intermediate Turbine Ducts Under the Influence of Purge Flows
,”
ASME J. Turbomach.
,
146
(
5
), p.
051014
.
6.
Tennekes
,
H.
, and
Lumley
,
J.
,
1972
,
A First Course in Turbulence
,
Massachusetts Institute of Technology Press
,
Cambridge, MA
.
7.
Torbergsen
,
L. E.
, and
Krogstad
,
P-Ä
,
1998
, “
Axisymmetric Contraction of Fully Developed Pipe Flow, Melbourne, Australia
,”
13th Australasian Fluid Mechanics Conference
,
Melbourne, Australia
,
Dec. 13–18
.
8.
Neumayer
,
F.
,
Kulhanek
,
G.
,
Pirker
,
H.
,
Jericha
,
H.
,
Seyr
,
A.
, and
Sanz
,
W.
,
2001
, “
Operational Behavior of a Complex Transonic Test Turbine Facility
,” ASME Paper No. GT2000-489,
New Orleans, LA
,
June 4–7
.
9.
Steiner
,
M.
,
Zerobin
,
S.
,
Bauinger
,
S.
,
Heitmeir
,
F.
, and
Göttlich
,
E.
,
2017
, “
Development and Commissioning of a Purge Flow System in a Two Spool Test Facility
,”
12th European Conference on Turbomachinery
,
Stockholm, Sweden
,
April 03–07
.
10.
Bearman
,
P. W.
,
1971
, “
Corrections for the Effect of Ambient Temperature Drift on Hot-Wire Measurements in Incompressible Flow
,” DISA.
11.
Hösgen
,
C.
,
Behre
,
S.
,
Hönen
,
H.
, and
Jeschke
,
P.
,
2016
, “
Analytical Uncertainty Analysis for Hot-Wire Measurements
,”
Turbomachinery Technical Conference & Exposition
,
Seoul, South Korea
,
June 13–17
.
12.
Lengani
,
D.
,
Santner
,
C.
,
Spataro
,
R.
, and
Göttlich
,
E.
,
2012
, “
Analysis Tools for the Unsteady Interactions in a Counter-Rotating Two-Spool Turbine rig
,”
Exp. Therm. Fluid. Sci.
,
42
, pp.
248
257
.
13.
Taylor
,
G. I.
,
1938
, “
The Spectrum of Turbulence
,”
Proc. R. Soc. A
,
164
(
919
), pp.
476
490
.
14.
Hinze
,
J. O.
,
1975
,
Turbulence
,
McGraw-Hill
,
New York
.
15.
Lumley
,
J. L.
, and
Newman
,
G. R.
,
1977
, “
The Return to Isotropy of Homogeneous Turbulence
,”
J. Fluid Mech.
,
82
(
1
), pp.
161
178
.
16.
Sanz
,
W.
,
Zerobin
,
S.
,
Egger
,
M.
,
Bader
,
P.
,
Pieringer
,
P.
,
Göttlich
,
E.
, and
Heitmeir
,
F.
,
2018
, “
Steady CFD Simulation of a High Pressure Turbine Rotor With Hub and Shroud Purge Flow
,”
ASME Turbo Expo
,
Oslo, Norway
,
June 11–15
.
17.
Zerobin
,
S.
,
Peters
,
A.
,
Bauinger
,
S.
,
Ramesh
,
A. B.
,
Steiner
,
M.
,
Heitmeir
,
F.
, and
Göttlich
,
E.
,
2018
, “
Aerodynamic Performance of Turbine Center Frames With Purge Flows—Part I: The Influence of Turbine Purge Flow Rates
,”
ASME J. Turbomach
,
140
(
6
), p.
061009
.
18.
Pope
,
S. B.
,
2000
,
Turbulent Flows
,
Cambridge University Press
,
Cambridge, UK
.
19.
Krajnc
,
N.
,
Merli
,
F.
,
Hafizovic
,
A.
,
Peters
,
A.
, and
Göttlich
,
E.
,
2022
, “
Numerical Investigation of a Turning Vane Frame for Co-and Counter-Rotating Configuration
,”
ASME Turbo Expo 2022
,
Rotterdam, The Netherlands
,
June 13–17
.
20.
Merli
,
F.
,
Hafizovic
,
A.
,
Krajnc
,
N.
,
Peters
,
A.
,
Göttlich
,
E.
, and
Heitmeir
,
F.
,
2022
, “
Aerodynamic Assessment of Turbine Center Frames and Turbine Vane Frames Under the Influence of Purge Flows
,”
ASME Turbo Expo 2022
,
Rotterdam, The Netherlands
,
June 13–17
.
21.
Lebedev
,
V. P.
,
Lemanov
,
V. V.
,
Misyura
,
S. Y.
, and
Terekhov
,
V. I.
,
1994
, “
Effect of Flow Acceleration and Initial Turbulence Level on Velocity Fluctuations
,”
Fluid Dyn.
,
28
(
5
), pp.
624
629
.
22.
Ames
,
F. E.
, and
Plesniak
,
M. W.
,
1997
, “
The Influence of Large-Scale, High-Intensity Turbulence on Vane Aerodynamic Losses, Wake Growth, and the Exit Turbulence Parameters
,”
ASME J. Turbomach.
,
119
(
2
), pp.
182
192
.
23.
Lumley
,
J. L.
,
1979
, “
Computational Modeling of Turbulent Flows
,”
Adv. Appl. Mech.
,
18
, pp.
123
176
.
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