Accession Number : ADA302324

Title :   Description of the Insulation System for the Langley 0.3-Meter Transonic Cryogenic Tunnel.

Descriptive Note : Technical memo.,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Lawing, Pierce L. ; Dress, David A. ; Kilgore, Robert A.

PDF Url : ADA302324

Report Date : JAN 1985

Pagination or Media Count : 28

Abstract : The thermal insulation system of the Langley 0.3- Meter Transonic Cryogenic Tunnel is described. The insulation system is designed to operate from room temperature down to about 77.4K, the temperature of liquid nitrogen at 1 atmosphere. A detailed description is given of the primary insulation system which consists of glass fiber mats, a three-part vapor barrier, and a dry nitrogen positive-pressure purge system. Also described are several secondary insulation systems required for the test section actuators, and tunnel supports. An appendix briefly describes the original insulation system which is considered inferior to the one presently in place. The time required for opening and closing portions of the insulation system for modification or repair to the tunnel has been reduced, typically, from a few days for the original thermal insulating system to a few hours for the present system. (MM)

Descriptors :   *CRYOGENICS, *TRANSONIC FLOW, *THERMAL INSULATION, GLASS FIBERS, MACH NUMBER, LIQUID NITROGEN, REYNOLDS NUMBER, TRANSONIC WIND TUNNELS.

Subject Categories : Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE