Performance Technology Program (PTP-S II). Volume V. Infrared Mapping of Boundary Layer Transition on a Slender Cone
Abstract
Surface heating was measured and boundary layer transition locations were deduced on a 7 deg half-angle cone model with a base diameter of 12.3 in. The tests were performed at Mach 8 in Tunnel B of the vonKarman Test Facility at Arnold Engineering Development Center. The objective of the current effort was to experimentally define transition onset, zone extent and shape for configurations with (a) preshaped noses, (b) roughness patches simulating antenna windows, (c) steps due to misaligned frusta, and (d) biconic frusta. The model was made of an epoxy material whose insulating and emissive properties facilitated data acquisition through the VKF infrared scanning camera. The IR data was digitized and converted to surface temperature values by means of an equation derived from the basic laws of radiation. Local heat transfer rates were then deduced from the temperature data under the assumption that the model's surface temperature history was that of a homogeneous, semi-infinite slab subjected to a constant heat transfer cooefficient. Comparisons of transition onset and end deduced from the IR system data are shown to compare favorably with data deduced from models instrumented with thermocouples or gardon heat gages. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1980
- Accession Number
- ADA108847
Entities
People
- A. Martellucci
- Francis J. Makowski