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Boundary-Layer Detection at Cryogenic Conditions Using Temperature Sensitive Paint Coupled with a Carbon Nanotube Heating Layer
External Online Source: doi:10.3390/s16122062
Author and Affiliation:
Goodman, Kyle Z.(Analytical Mechanics Associates, Inc., Hampton, VA, United States)
Lipford, William E.(NASA Langley Research Center, Hampton, VA, United States)
Watkins, Anthony Neal(NASA Langley Research Center, Hampton, VA, United States)
Abstract: Detection of flow transition on aircraft surfaces and models can be vital to the development of future vehicles and computational methods for evaluating vehicle concepts. In testing at ambient conditions, IR thermography is ideal for this measurement. However, for higher Reynolds number testing, cryogenic facilities are often used, in which IR thermography is difficult to employ. In these facilities, temperature sensitive paint is an alternative with a temperature step introduced to enhance the natural temperature change from transition. Traditional methods for inducing the temperature step by changing the liquid nitrogen injection rate often change the tunnel conditions. Recent work has shown that adding a layer consisting of carbon nanotubes to the surface can be used to impart a temperature step on the model surface with little change in the operating conditions. Unfortunately, this system physically degraded at 130 K and lost heating capability. This paper describes a modification of this technique enabling operation down to at least 77 K, well below the temperature reached in cryogenic facilities. This is possible because the CNT layer is in a polyurethane binder. This was tested on a Natural Laminar Flow model in a cryogenic facility and transition detection was successfully visualized at conditions from 200 K to 110 K. Results were also compared with the traditional temperature step method.
Publication Date: Dec 03, 2016
Document ID:
20170007914
(Acquired Dec 14, 2017)
Subject Category: COMPOSITE MATERIALS; AERODYNAMICS
Report/Patent Number: NF1676L-25732
Document Type: Journal Article
Publication Information: Sensors (e-ISSN 1424-8220); Volume 16; Issue 12; 2062
Publisher Information: MDPI AG
Contract/Grant/Task Num: WBS 109492.02.07.02.20
Financial Sponsor: NASA Langley Research Center; Hampton, VA, United States
Description: 17p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: BOUNDARY LAYERS; CARBON NANOTUBES; CRYOGENICS; HEATING; INFRARED IMAGERY; LIQUID NITROGEN; POLYURETHANE RESINS; TEMPERATURE SENSITIVE PAINTS; THERMOGRAPHY; BINDERS (MATERIALS); IMAGE CONTRAST; LAMINAR FLOW; REYNOLDS NUMBER; TRANSITION FLOW; TURBULENT FLOW
Availability Source: Other Sources
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