Accession Number : AD0467688

Title :   RESEARCH LEADING TO THE DEVELOPMENT OF A HYDROGEN-AIR FIRE AND EXPLOSION DETECTION SYSTEM FOR AEROSPACE VEHICLES.

Descriptive Note : Technical rept., 15 Apr-15 Dec 64,

Corporate Author : THIOKOL CHEMICAL CORP DENVILLE NJ REACTION MOTORS DIV

Personal Author(s) : Hill, Kenneth ; Hornstein, Bernard ; Michaelis, T.

Report Date : JUN 1965

Pagination or Media Count : 79

Abstract : Previous work demonstrated that timely detection of hydrogen-air deflagrations in aerospace vehicle environments is best based upon detection of OH band radiation (UV) from the reaction zone. The main goal of the present work was to determine to what extent this principle could be applied in a practical system to provide timely, reliable, and useful detection of incipient deflagration hazards in flight vehicles under all hazardous operational conditions. Ideally this system would not only detect a hazardous reaction but also evaluate the degree of hazard through quantitative electronic processing of the early time history of the radiation from the reaction zone. In this connection a series of simulated leak tests, with ignition occurring in partially mixed, non-homogeneous hydrogen-air systems proved that the time rate of growth of radiation and pressure were highly variable and depended not upon gross stoichiometry but primarily upon the relative positions of leak and ignition source, leak rate and orientation, and chamber geometry which govern the degree of mixing obtained at the time of ignition. (Author)

Descriptors :   *AEROSPACE CRAFT, *FIRES, *DETECTION, *EXPLOSIONS, HYDROGEN, FEASIBILITY STUDIES, ULTRAVIOLET RADIATION, HYDROXIDES, DEFLAGRATION, AIR, SIMULATION, MODELS, COMBUSTION CHAMBERS, PHOTOMULTIPLIER TUBES, INTERFERENCE, SOLAR RADIATION, WIRING DIAGRAMS, DETECTORS, FIRE SAFETY.

Distribution Statement : APPROVED FOR PUBLIC RELEASE