Title

Comparison Of Relative Costs Of Thermal Analysis Methods For Hypersonic Vehicle Compartments

Date

1961

Index Abstract

Contrails and DTIC condensed

Photo Quality

Not Needed

Report Number

WADD TR 60-768

Creator

Malcolm, John R.

Slack, Robert L.

Corporate Author

Boeing Airplane Company

Laboratory

Aeronautical Accessories Laboratory

Extent

201

Identifier

AD0267059

AD0267059

Access Rights

OTS

Distribution Classification

1

Contract

AF 33(616)-6339

DoD Project

6146

DoD Task

60753

DTIC Record Exists

Yes

Distribution Change Authority Correspondence

None

Report Availability

Full text available

Date Issued

1961-07

Abstract

In order to design the cooling systems of re-entry vehicles, judgment must b exercised in selecting the appropriate method for determining the transient heat transfer through complex structure into manned and equipment compartments. The accuracy must be consistent with the available calendar time, manpower and dollar cost in making this judgment. The heat flow can be determined analytically by several computing methods and experimentally by several laboratory testing methods.
This report presents the results of a study to examine the relationships between accuracy and cost in manhours, calendar time and dollars, in determining this transient heat flow for two hypothetical re-entry vehicles.
Accuracy and cost information were obtained for analytical methods: hand calculations, digital computers, differential analyzers, and passive element analogues; and for experimental methods: various size panels, half and full size vehicles, and vehicle compartments. Results are presented as curves of accuracy as a function of cost.
For the problems of this study, a general heat transfer digital computer program provides the most accuracy for the least cost. The other computing techniques rank in the following order: differential analyzer, passive element analogue, and hand calculations. The differential analyzer is the best method for parameter studies where a large number of runs is expected.
Experimental methods cannot compete with analytical methods in dollar cost, calendar time, or manhours. However, by obtaining material thermal properties experimentally, confidence can be increased in analytical solutions.

Subject

Air Conditioning Equipment

Heat Transfer

Hypersonic Vehicles

Mathematical Analysis

Reentry Vehicles

Test Methods

Aerodynamic Heating

Cooling

Costs

Materials

Measurement

Thermal Conductivity

Publisher

Wright-Patterson Air Force Base, OH : Aeronautical Systems Division, Air Force Systems Command, United States Air Force

Distribution Conflict

No

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Format

1 online resource