In the present paper, an experimental investigation of the effects of rim seal purge flow on the performance of a highly loaded axial turbine stage is presented. The test configuration consists of a one-and-a-half stage, unshrouded, turbine, with a blading representative of high pressure (HP) gas turbines. Efficiency measurements for various purge flow injection levels have been carried out with pneumatic probes at the exit of the rotor and show a reduction of isentropic total-to-total efficiency of 0.8% per percent of injected mass flow. For three purge flow conditions, the unsteady aerodynamic flow field at rotor inlet and rotor exit has been measured with the in-house developed fast response aerodynamic probe (FRAP). The time-resolved data show the unsteady interaction of the purge flow with the secondary flows of the main flow and the impact on the radial displacement of the rotor hub passage vortex (HPV). Steady measurements at off-design conditions show the impact of the rotor incidence and of the stage flow factor on the resulting stage efficiency and the radial displacement of the rotor HPV. A comparison of the effect of purge flow and of the off-design conditions on the rotor incidence and stage flow factor shows that the detrimental effect of the purge flow on the stage efficiency caused by the radial displacement of the rotor HPV is dominated by the increase of stage flow factor in the hub region rather than by the increase of negative rotor incidence.
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April 2015
Research-Article
Experimental Investigation of Purge Flow Effects on a High Pressure Turbine Stage
K. Regina,
K. Regina
1
Laboratory for Energy Conversion,
Department of Mechanical
and Process Engineering,
e-mail: regina@lec.mavt.ethz.ch
Department of Mechanical
and Process Engineering,
ETH Zurich
,Sonneggstrasse 3
,Zurich CH-8092
, Switzerland
e-mail: regina@lec.mavt.ethz.ch
1Corresponding author.
Search for other works by this author on:
A. I. Kalfas,
A. I. Kalfas
Department of Mechanical Engineering,
e-mail: akalfas@auth.gr
Aristotle University of Thessaloniki
,Thessaloniki GR-54124
, Greece
e-mail: akalfas@auth.gr
Search for other works by this author on:
R. S. Abhari
R. S. Abhari
Laboratory for Energy Conversion,
Department of Mechanical
and Process Engineering,
e-mail: abhari@lec.mavt.ethz.ch
Department of Mechanical
and Process Engineering,
ETH Zurich
,Sonneggstrasse 3
,Zurich CH-8092
, Switzerland
e-mail: abhari@lec.mavt.ethz.ch
Search for other works by this author on:
K. Regina
Laboratory for Energy Conversion,
Department of Mechanical
and Process Engineering,
e-mail: regina@lec.mavt.ethz.ch
Department of Mechanical
and Process Engineering,
ETH Zurich
,Sonneggstrasse 3
,Zurich CH-8092
, Switzerland
e-mail: regina@lec.mavt.ethz.ch
A. I. Kalfas
Department of Mechanical Engineering,
e-mail: akalfas@auth.gr
Aristotle University of Thessaloniki
,Thessaloniki GR-54124
, Greece
e-mail: akalfas@auth.gr
R. S. Abhari
Laboratory for Energy Conversion,
Department of Mechanical
and Process Engineering,
e-mail: abhari@lec.mavt.ethz.ch
Department of Mechanical
and Process Engineering,
ETH Zurich
,Sonneggstrasse 3
,Zurich CH-8092
, Switzerland
e-mail: abhari@lec.mavt.ethz.ch
1Corresponding author.
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF TURBOMACHINERY. Manuscript received August 6, 2014; final manuscript received August 14, 2014; published online October 28, 2014. Editor: Ronald Bunker.
J. Turbomach. Apr 2015, 137(4): 041006 (8 pages)
Published Online: October 28, 2014
Article history
Received:
August 6, 2014
Revision Received:
August 14, 2014
Citation
Regina, K., Kalfas, A. I., and Abhari, R. S. (October 28, 2014). "Experimental Investigation of Purge Flow Effects on a High Pressure Turbine Stage." ASME. J. Turbomach. April 2015; 137(4): 041006. https://doi.org/10.1115/1.4028432
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