Title:
FLUID TEMPERATURE MEASUREMENT
Document Type and Number:
WIPO Patent Application WO/2004/046672
Kind Code:
A1
Abstract:
A fluid temperature measurement probe, particularly for total temperature measurements in high temperature unsteady gas flows, such as in gas turbine engines. A pair of thin film resistance thermometers (6) and (7) are deposited on the probe to sense its surface temperature at respective locations and the structure of the probe is configured such that the regions into which heat diffuses from the respective locations have different thermal products. In this way the thin film elements (6) and (7) experience different heat transfer rates when exposed to the same fluid temperature. In the Figure (1) embodiment this is achieved by applying one of the elements (7) to the surface of a solid rod (2) of glass or ceramic and the other element (6) to a portion which has been machined to leave an air pocket (4) under a thin cylindrical wall (3) of the rod material. In use the probe is exposed only temporarily to the high temperature fluid and withdrawn again before reaching its softening temperature. The total temperature Tt of the fluid can be calculated from the expression Tt = Tw1 + q1(Tw2 - Tw1) / (q1 - q2), where Tw1, and Tw2 are the probe surface temperatures as measured by the respective thin film elements and q1 and q2 are the respective heat transfer rates experienced thereby, the latter derived from the respective surface temperature histories.
Inventors:
CHANA KAMALJIT SINGH (GB)
Application Number:
PCT/GB2003/004959
Publication Date:
June 03, 2004
Filing Date:
November 17, 2003
Export Citation:
Assignee:
QINETIQ LTD (GB)
CHANA KAMALJIT SINGH (GB)
CHANA KAMALJIT SINGH (GB)
International Classes:
G01K13/02; (IPC1-7): G01K7/18; G01K7/42; G01K13/02
Foreign References:
| GB2314164A | 1997-12-17 | |||
| US3776039A | 1973-12-04 |
Other References:
HOGG S I ET AL: "Wide bandwidth stagnation temperature measurements in vortical flows behind turbine vanes", INSTRUMENTATION IN AEROSPACE SIMULATION FACILITIES, 1997. ICIASF '97 RECORD., INTERNATIONAL CONGRESS ON PACIFIC GROVE, CA, USA 29 SEPT.-2 OCT. 1997, NEW YORK, NY, USA,IEEE, US, 29 September 1997 (1997-09-29), pages 389 - 400, XP010261258, ISBN: 0-7803-4167-8
S. G. MALLINSON ET AL.: "Gun tunnel flow calibration: defining input conditions for hypersonic flow computations", SHOCK WAVES, no. 10, 2000, pages 313 - 322, XP002270920
W. K. GEORGE ET AL: "An Evaluation of Analog and Numerical Techniques for Unsteady Heat Transfer Measurement with Thin-Film Gauges in Transient Facilities", EXPERIMANTAL THERMAL AND FLUID SCIENCE, no. 4, 1991, pages 333 - 342, XP002270921
S. G. MALLINSON ET AL.: "Gun tunnel flow calibration: defining input conditions for hypersonic flow computations", SHOCK WAVES, no. 10, 2000, pages 313 - 322, XP002270920
W. K. GEORGE ET AL: "An Evaluation of Analog and Numerical Techniques for Unsteady Heat Transfer Measurement with Thin-Film Gauges in Transient Facilities", EXPERIMANTAL THERMAL AND FLUID SCIENCE, no. 4, 1991, pages 333 - 342, XP002270921
Attorney, Agent or Firm:
Obee, Robert William (Cody Technology Park A4 Building, Room G016,
Ively Roa, Farnborough Hampshire GU14 0LX, GB)
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