Accession Number : AD0262039

Title :   RECOMBINATION OF HYDROGEN-AIR COMBUSTION PRODUCTS IN AN EXHAUST NOZZLE

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON D C

Personal Author(s) : LEZBERG,ERWIN A. ; LANCASHIRE,RICHARD B.

Report Date : AUG 1961

Pagination or Media Count : 1

Abstract : Thrust losses due to the inability of dissociated combustion gases to recombine in exhaust nozzles are of primary interest for evaluating the performance of hypersonic ramjets. Some results for the expansion of H-air combustion products are described. Combustion air was preheated up to 3300 R to simulate high-Mach-number flight conditions. Static-temperature measurements using the line reversal method and wall static pressures were used to indicate the state of the gas during expansion. Results indicated substantial departure from the shifting equilibrium curve beginning slightly downstream of the nozzle throat at stagnation pressures of 1.7 and 3.6 atmospheres. The results are compared with an approximate method for determining a freezing point using an over-all rate equation for the oxidation of H. (Author)

Descriptors :   *EXHAUST GASES, *EXHAUST NOZZLES, *JET PROPULSION, *RAMJET ENGINE NOZZLES, *RAMJET ENGINES, *THRUST, AIR, COMBUSTION CHAMBER GASES, DISSOCIATION, GAS FLOW, GASES, HYDROGEN, HYPERSONIC FLOW, INSTRUMENTATION, RECOMBINATION REACTIONS, THERMODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE