Accession Number : AD0277801

Title :   RESEARCH ON GAS SCINTILLATIONS FROM IONISING RADIATIONS

Corporate Author : AIR FORCE OFFICE OF SCIENTIFIC RESEARCH ARLINGTON VA

Personal Author(s) : NICHOLLS,R.W.

Report Date : 31 MAY 1962

Pagination or Media Count : 1

Abstract : DESCRIPTORS: *Combustio - Reaction kinetics, *Nitrogen compounds - Detonation, *Hydrogen Ignition, *Oxygen - Ignition. Oxides, Pres sure, Explosions, Temperature, Kinetic theory, Decomposition, Liquid rocket propellants, Low pressure research, Theory, Gases, Analysis, Test equipment, Test methods, Mathematical analysis, Fluid mechanics. The detonability of N2O was investigated. Detonation could not be achieved for initial pressures to 300 psig at 40 C initial temp rature nor for initial pressures to 500 psig at 230 C initial temperature. Explosion limits were determined for pure N2O between atmospheric pressure and approximately 48 atm initial pressure when an exploding wire was employed to add energy to the gas in a bomb. Kinetics studies of N2O were conducted at 863, 896 and 925 K for initial pressures ranging from 250 to 555 psia. The reaction is primarily first order. Because of a spontaneous explosion at 925 K, the mechanism appears more complicated than just a simple first-order reaction. Ignition temperatures of H2-O2 mixtures at atmospheric pressure were determined in a diaphragmless shock tube. For a 30% fuel concentration mixture, the lowest observed ignition temperature was 654 K wi h an ignition lag of 211 microsec. The shortest time delay was 36 microsec with an ignition temperature of 846 K. With a stoichiometric mixture, the lowest ignition temperature was 757 K. A glass vacuum system was constructed to study reactions at ultra low pressures. Pressures down to 8 x 10 to the -9 mm Hg were obtained. (Author)

Descriptors :   ELECTRON TRANSITIONS, ION BEAMS, PLASMAS(PHYSICS)

Distribution Statement : APPROVED FOR PUBLIC RELEASE