NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
A theoretical study of non-adiabatic surface effects for a model in the NTF cryogenic wind tunnelA theoretical analysis was made of the severity and effect of nonadiabatic surface conditions for a model in the NTF cryogenic wind tunnel. The nonadiabatic condition arises from heaters that are used to maintain a constant thermal environment for instrumentation internal to the model. The analysis was made for several axi-symmetric representations of a fuselage cavity, using a finite element heat conduction code. Potential flow and boundary layer codes were used to calculate the convection condition for the exterior surface of the model. The results of the steady state analysis show that it is possible to maintain the surface temperature very near the adiabatic value, with the judicious use of insulating material. Even for the most severe nonadiabatic condition studied, the effects on skin friction drag and displacement thickness were only marginally significant. The thermal analysis also provided an estimate of the power required to maintain a specified cavity temperature.
Document ID
19850026039
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Macha, J. M. (Texas A&M Univ. College Station, TX, United States)
Pare, L. A. (Texas A&M Univ. College Station, TX, United States)
Landrum, D. B. (Texas A&M Univ. College Station, TX, United States)
Date Acquired
September 5, 2013
Publication Date
January 1, 1985
Publication Information
Publisher: NASA
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.26:3924
NASA-CR-3924
TR-83-4975-02
Accession Number
85N34352
Funding Number(s)
PROJECT: RTOP 505-31-53-10
CONTRACT_GRANT: NAG1-417
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available