Accession Number : AD0674396

Title :   THE HEAT BARRIER,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Yeh,Wei

Report Date : 21 DEC 1967

Pagination or Media Count : 10

Abstract : In a discussion of the heat barrier, the author first explains how this heat is produced. He notes that the problem was first discovered by the Germans in their experiments with V-2 rockets. He then describes the methods used to solve the problem. There are essentially two approaches to carry away the heat: by absorption and by radiation. The absorption techniques include: (1) Cooling by convection; the aircraft or rocket has a double wall with a gas or a liquid cooling agent in between to absorb the heat; (2) Cooling by evaporation; liquid is ejected from tiny holes punched in the wall of the aircraft; (3) Cooling by conduction; a thick shield is used and the heat is conducted away; (4) The burnout device; a protective layer is mounted on the craft; high temperature melts and burns this layer or starts a chemical reaction which absorbs large quantities of heat. The radiation technique uses an insulator which has a high radiation power. (Author)

Descriptors :   (*REENTRY VEHICLES, *HEAT TRANSFER), THERMAL RADIATION, ABSORPTION, ATMOSPHERE ENTRY, AERODYNAMIC HEATING, COOLING, EVAPORATION, THERMAL INSULATION, HEAT SHIELDS, ROCKETS, ABLATION, CHINA

Subject Categories : Thermodynamics
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE