Methods for measuring convection flux in the R2 and R3 wind tunnels at Chalais-Meudon - Current implementation and future developments
Abstract
The principles, advantages, and disadvantages of the three convection-flux measurement methods employed in the R2 and R3 gust wind tunnels at Chalais-Meudon are discussed. While the calorimetric method has the advantages of high precision and the use of thermocouples which do not require calibration, it is not suitable for studying unsteady phenomena or thin surfaces. While offering flexibility, low cost, and great detail, the thermosensitive painting visualization method does not permit the visualization of certain zones and cannot measure exchange coefficients which are less than about 0.005 W/sq cm per K. The surface-temperature method, which makes possible the study of extremely fast phenomena, is illustrated with examples such as the measurement of the stagnation enthalpy in a plasma-generating wind tunnel.
- Publication:
-
Colloque d'Aerodynamique Appliquee
- Pub Date:
- October 1987
- Bibcode:
- 1987aeap.coll.....C
- Keywords:
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- Aerothermodynamics;
- Convective Heat Transfer;
- Heat Measurement;
- Wind Tunnel Tests;
- Calorimeters;
- Engine Design;
- Hypersonic Flight;
- Paints;
- Temperature Sensors;
- Instrumentation and Photography