Heat Transfer Measurements Using Infra-Red Thermography in Rarefied Flows
DEFENCE RESEARCH AGENCY FARNBOROUGH (UNITED KINGDOM) AEROSPACE DIV
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Tests have been carried out in the Defence Research Agency Low Density Wind Tunnel to determine the heat transfer rate on a flat plate and a series of sharp slender cones. The tests were carried out in the transitional rarefied flow regime. An infrared scanning camera system was used to determine surface temperatures and hence heat transfer rate. Data were compared with two analytical theories and one existing set of data. Results show that the IR system is at least as good at determining heat transfer rates as a thermocouple technique and has better spatial resolution. The technique is also sensitive enough to detect changes in the state of the flow over the surface of models.