An experimental technique for the measurement of flow total temperature in a turbine facility is demonstrated. Two thin film heat transfer gases located at the stagnation point of fused quartz substrates are operated at different temperatures in order to determine the flow total temperature. With this technique, no assumptions regarding the magnitude of the convective heat transfer coefficient are made. Thus, the probe can operate successfully in unsteady compressible flows of arbitrary composition and high free-stream turbulence levels without a heat transfer law calibration. The operation of the total temperature probe is first demonstrated using a small wind tunnel facility. Based on results from the small wind tunnel tests, it appears that the probe total temperature measurements are accurate to within ±1 K. Experiments using the probe downstream of a high-pressure turbine stage are than described. Both high and low-frequency components of the flow total temperature can be accurately resolved with the present technique. The probe measures a time-averaged flow total temperature that is in good agreement with thermocouple measurements made downstream of the rotor. Frequencies as high as 182 kHz have been detected in the spectral analysis of the heat flux signals from the total probe. Through comparison with fast-response aerodynamic probe measurements, it is demonstrated that the current measurement location, the total temperature fluctuations arise mainly due to the isentropic extraction of work by the turbine. The present total temperature probe is demonstrated to be an accurate, robust, fast-response device that is suitable for operation in a turbomachinery environment.

Issue Section:
Research Papers
Topics:
High pressure (Physics), Temperature measurement, Turbines, Probes, Temperature, Flow (Dynamics), Heat transfer, Wind tunnels, Calibration, Compressible flow, Convection, Emission spectroscopy, Flow measurement, Fluctuations (Physics), Gases, Heat flux, Quartz, Rotors, Signals, Spectroscopy, Thermocouples, Thin films, Turbomachinery, Turbulence
1.
Ainsworth
R. W.
,
Allen
J. L.
, and
Batt
J. J.
,
1995
, “
The Development of Fast Response Aerodynamic Probes for Flow Measurements in Turbomachinery
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
117
, pp.
625
–
634
.
2.
Alday, J., Osborne, D. J., Morris, M. B., Ng, W., and Gertz, J., 1993, “Flow Randomness and Tip Losses in Transonic Rotors,” ASME Paper No. 93-GT-189.
3.
Buttsworth, D. R., 1997, “A Finite Difference Routine for the Solution of Transient One Dimensional Heat Conduction Problems With Varying Thermal Property and Curvature Effects,” Department of Engineering Science, University of Oxford, Report.
4.
Buttsworth, D. R., and Jones, T. V., 1996, “A Fast-Response Total Temperature Probe for Unsteady Compressible Flows,” ASME Paper No. 96-GT-350; ASEM Journal of Engineering for Gas Turbines and Power, in press.
5.
Goodisman
M. I.
,
Oldfield
M. L. G.
,
Kingcombe
R. C.
,
Jones
T. V.
,
Ainsworth
R. W.
, and
Brooks
A. J.
,
1992
, “
An Axial Turbobrake
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
114
, pp.
419
–
425
.
6.
Giles
M. B.
,
1988
, “
Calculation of Unsteady Wake/Rotor Interaction
,”
J. Prop. and Power
, Vol.
4
, No.
4
, pp.
356
–
362
.
7.
Hilditch, M. A., Fowler, A., Jones, T. V., Chana, K. S., Oldfield, M. L. G., Ainsworth, R. W., Hogg, S. I., Anderson, S. J., and Smith, G. C., 1994, “ Installation of a Turbine Stage in the Pyestock Isentropic Light Piston Facility,” ASME Paper No. 94-GT-277.
8.
Hilditch, M. A., Smith, G. C., Anderson, S. J., Channa, K. S., Jones, T. V., Ainsworth R. W., and Oldfield, M. L. G., 1995, “Unsteady Measurements in an Axial Flow Turbine,” AGARD PEP 85th Symposium, May 1995, Derby, U.K.
9.
Jones, T. V., Oldfield, M. L. G., and Arts, T., 1993, “Transient Cascade Testing” Advanced Methods for Cascade Testing, C. Hirsch, ed., AGARDograph 328.
10.
Ng
W. F.
, and
Epstein
A. H.
,
1983
, “
High-Frequency Temperature and Pressure Probe for Unsteady Compressible Flows
,”
Rev. Sci. Instrum.
, Vol.
54
, No.
12
, pp.
1678
–
1683
.
11.
Oldfield, M. L. G., Burd, H. J., and Doe, N. G., 1982, “Design of Wide-Band-width Analogue Circuits for Heat Transfer Instrumentation in Transient Wind Tunnels,” Proc. 16th Symp. of International Centre for Heat and Mass Transfer, Hemisphere Publishing, pp. 233–257.
12.
Smout, P. D., and Cook, S. C., 1996, “Simple Instrumentation Rake Designs for Gas Turbine Engine Testing,” ASME Paper No. 96-GT-32.
13.
Suryavamshi
N.
,
Lakshminarayana
B.
, and
Prato
J.
,
1998
, “
Aspirating Probe Measurements of the Unsteady Total Temperature Field Downstream of an Embedded Stator in a Multistage Axial Flow Compressor
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
120
, pp.
156
–
169
.
14.
Van Zante
D. E.
,
Suder
K. L.
,
Strazisar
A. J.
, and
Okiishi
T. H.
,
1995
, “
An Improved Aspirating Probe for Total-Temperature and Total-Pressure Measurements in Compressor Flows
,”
ASME JOURNAL OF TURBOMACHINERY
, Vol.
117
, pp.
642
–
649
.
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