BALANCE FOR MEASURING SKIN FRICTION IN THE PRESENCE OF HEAT TRANSFER
NAVAL ORDNANCE LAB WHITE OAK MD
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The development of a skin-friction balance to be used in a wind tunnel with heat-transfer conditions is described. The balance is a null-type device with a floating head element whose temperature can be maintained between 100K and 345K. This is accomplished with a cooled or heated jacket that is placed in direct contact with the friction element. At the desired element temperature the jacket is separated from the element and the shear-force data is taken. The balance was used in a Mach 5 supersonic flow with moderate heat- transfer rates. Shear forces ranging from 0.05 gmsq cm to 1 gmsq cm have been measured and higher ranges can be obtained by simply changing a coil spring.
- Test Facilities, Equipment and Methods
- Fluid Mechanics