Author: J. M. Macha
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 64
Book Description
A 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.
A Theoretical Study of Non-adiabatic Surface Effects for a Model in the NTF Cryogenic Wind Tunnel
Author: J. M. Macha
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 64
Book Description
A 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.
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 64
Book Description
A 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.
A Theoretical Study of Non-adiabatic Surface Effects for a Model in the NTF Cryogenic Wind Tunnel
Author: John Michael Macha
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 64
Book Description
Publisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 64
Book Description
Cryogenic Wind Tunnels: A Comprehensive, Annotated Bibliography
Author: Marie H. Tuttle
Publisher:
ISBN:
Category : Low temperature engineering
Languages : en
Pages : 146
Book Description
Publisher:
ISBN:
Category : Low temperature engineering
Languages : en
Pages : 146
Book Description
NASA Technical Memorandum
Theoretical Study of Nonadiabatic Boundary-layer Stabilization Times in a Cryogenic Wind Tunnel for Typical Stainless-steel Wing and Fuselage Models
Author: Charles B. Johnson
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 48
Book Description
Publisher:
ISBN:
Category : Heat
Languages : en
Pages : 48
Book Description
Scientific and Technical Information Output of the Langley Research Center for Calendar Year 1985
Scientific and Technical Aerospace Reports
Airborne Lidar Experiments at the Savannah River Plant
Author: William B. Krabill
Publisher:
ISBN:
Category : Aerial photographs in botany
Languages : en
Pages : 776
Book Description
Publisher:
ISBN:
Category : Aerial photographs in botany
Languages : en
Pages : 776
Book Description
Energy Research Abstracts
Monthly Catalogue, United States Public Documents
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1208
Book Description
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1208
Book Description