Research Papers

Turbine Efficiency Measurement System for the QinetiQ Turbine Test Facility

[+] Author and Article Information
Paul F. Beard, Thomas Povey

Department of Engineering Science, University of Oxford, Parks Road, Oxfordshire, OX1 3PJ, UK

Kamaljit S. Chana

 QinetiQ Ltd., Cody Technology Park, Ively Road, Farnborough, GU14 0LX, UK

J. Turbomach 132(1), 011002 (Sep 11, 2009) (13 pages) doi:10.1115/1.3066271 History: Received July 16, 2007; Revised October 09, 2008; Published September 11, 2009

A turbine efficiency measurement system has been developed and installed on the turbine test facility (TTF) at QinetiQ Farnborough. The TTF is an engine-scale short-duration (0.5s run time) rotating transonic facility, which can operate as either single stage (HP vane and rotor) or 112 stage (HP stage with IP or LP vane). The current MT1 HP stage is highly loaded and unshrouded and is therefore relevant to current design trends. Implementation of the efficiency measurement system forms part of the EU Turbine Aero-Thermal External Flows (TATEF II) program. The following aspects of the efficiency measurement system are discussed in this paper: mass-flow rate measurement, power measurement by direct torque measurement, turbine inlet and exit area traverse measurement systems, computation of efficiency by mass weighting, and uncertainty analysis of the experimentally determined turbine efficiency. The calibration of the mass-flow rate and torque measurement systems are also discussed. Emphasis was placed on the need for a low efficiency precision uncertainty, so that changes in efficiency associated with turbine inlet temperature distortion and swirl can be resolved with good accuracy. Measurements with inlet flow distortion form part of the TATEF II program and will be the subject of forthcoming publications.

Copyright © 2010 by American Society of Mechanical Engineers
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Figure 1

The QinetiQ turbine test facility

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Figure 2

Enthalpy-entropy chart showing a turbine expansion under adiabatic and nonadiabatic conditions

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Figure 3

TTF working section

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Figure 4

Strain gauge torque measurement system

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Figure 5

Strain gauge Wheatstone bridge circuit

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Figure 6

Torque calibration facility

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Figure 7

TTF strain gauge torque system calibration data

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Figure 8

MT1 shaft torque

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Figure 9

MT1 shaft torque with inlet total pressure

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Figure 10

TTF pump tube contraction and mass-flow rate instrumentation

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Figure 11

CFD prediction of static pressure on the pump tube contraction wall

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Figure 13

Π1 as a function of time for 44 experiments and best fit line

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Figure 12

Schematic of mass-flow rate blowdown calibration (not to scale)

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Figure 14

Bias error and standard deviation as a function of time

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Figure 15

Pump tube contraction effective area versus Reynolds number and Mach number

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Figure 16

Pump tube contraction mass-flow rate for ten runs

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Figure 17

MT1 stage mass-flow rate



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