Coaxial surface thermocouples - Analytical and experimental considerations for aerothermal heat-flux measurement applications
Abstract
Practices regarding the use of coaxial surface thermocouples are evaluated and the application of the finite difference code is appraised in terms of heat-transfer measurement. Analytical data are presented regarding temperature histories for different coaxial sensor set-ups by means of a finite-element model of the thermocouples. Heat-flux data are generated from the analytical temperature histories with a finite-difference heat-conduction code. An experimental application of varying time periods and different thermocouple lengths is presented and the results are compared to the analytical work. The effective time period of use for the thermocouples is found to be extended beyond that of the semiinfinite solid time constraints. The results also demonstrate that the coaxial sensor can be applied effectively in a number of configurations and not exclusively when it is the length of the model wall.
- Publication:
-
36th International Instrumentation Symposium
- Pub Date:
- 1990
- Bibcode:
- 1990isa..symp..203K
- Keywords:
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- Aerothermodynamics;
- Conductive Heat Transfer;
- Heat Flux;
- Thermocouples;
- Computer Programs;
- Finite Difference Theory;
- Instrumentation and Photography