Heating requirements and nonadiabatic surface effects for a model in the NTF (National Transonic Facility) cryogenic wind tunnel
A theoretical study has been made of the severity of nonadiabatic surface conditions arising from internal heat sources within a model in a cryogenic wind tunnel. Local surface heating is recognized as having an effect on the development of the boundary layer, which can introduce changes in the flow about the model and affect the wind tunnel data. The geometry was based on the NTF Pathfinder I wind tunnel model. A finite element heat transfer computer code was developed and used to compute the steady state temperature distribution within the body of the model, from which the surface temperature distribution was extracted. Particular three dimensional characteristics of the model were represented with various axisymmetric approximations of the geometry. This analysis identified regions on the surface of the model susceptible to surface heating and the magnitude of the respective surface temperatures. It was found that severe surface heating may occur in particular instances, but could be alleviated with adequate insulating material. The heat flux through the surface of the model was integrated to determine the net heat required to maintain the instrumentation cavity at the prescribed temperature. The influence of the nonadiabatic condition on boundary layer properties and on the validity of the wind tunnel simulation was also investigated. 20 refs., 12 figs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Lockheed Missiles and Space Co., Sunnyvale, CA (USA); National Aeronautics and Space Administration, Langley AFB, VA (USA). Langley Research Center
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5110256
- Report Number(s):
- SAND-88-1061C; CONF-880592-2; ON: DE88009253
- Resource Relation:
- Conference: 15. AIAA aerodynamic testing conference, San Diego, CA, USA, 18 May 1988
- Country of Publication:
- United States
- Language:
- English
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