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| Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
|---|---|
| Author | Buttsworth, D. R. Jones, T. V. Chana, K. S. |
| Copyright Year | 1997 |
| Abstract | An experimental technique for the measurement of flow total temperature in a turbine facility is demonstrated. Two thin film heat transfer gauges 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 ± 1K. Experiments using the probe downstream of a high pressure turbine stage are then 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 temperature probe. Through comparison with fast-response aerodynamic probe measurements, it is demonstrated that at 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. |
| Sponsorship | International Gas Turbine Institute |
| File Format | |
| ISBN | 9780791878712 |
| DOI | 10.1115/97-GT-407 |
| Volume Number | Volume 4: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award |
| Conference Proceedings | ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition |
| Language | English |
| Publisher Date | 1997-06-02 |
| Publisher Place | Orlando, Florida, USA |
| Access Restriction | Open |
| Subject Keyword | Spectroscopy Temperature Turbulence Emission spectroscopy Wind tunnels Rotors Thermocouples Flow measurement Turbomachinery Calibration Quartz Flow (dynamics) Gages Convection Heat flux Temperature measurement Thin films High pressure (physics) Fluctuations (physics) Signals Probes Turbines Heat transfer Compressible flow |
| Content Type | Text |
| Resource Type | Article |
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