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Title: Copper contamination effects on hydrogen-air combustion under SCRAMJET (supersonic combustion ramjet) testing conditions

Abstract

Two forms of copper catalytic reactions (homogeneous and heterogeneous) in hydrogen flames were found in a literature survey. Hydrogen atoms in flames recombine into hydrogen molecules through catalytic reactions, and these reactions which affect the timing of the combustion process. Simulations of hydrogen flames with copper contamination were conducted by using a modified general chemical kinetics program (GCKP). Results show that reaction times of hydrogen flames are shortened by copper catalytic reactions, but ignition times are relatively insensitive to the reactions. The reduction of reaction time depends on the copper concentration, copper phase, particle size (if copper is in the condensed phase), and initial temperature and pressure. The higher the copper concentration of the smaller the particle, the larger the reduction in reaction time. For a supersonic hydrogen flame (Mach number = 4.4) contaminated with 200 ppm of gaseous copper species, the calculated reaction times are reduced by about 9%. Similar reductions in reaction time are also computed for heterogeneous copper contamination. Under scramjet testing conditions, the change of combustion timing appears to be tolerable (less than 5%) if the Mach number is lower than 3 or the copper contamination is less than 100 ppm. The higher rate the Machmore » number, the longer the reaction time and the larger the copper catalytic effects. 7 tabs., 8 figs., 34 refs.« less

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (USA)
Sponsoring Org.:
USDOD
OSTI Identifier:
6126830
Report Number(s):
CONF-9011119-3
ON: DE91006545
DOE Contract Number:  
W-31109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 27. JANNAF combustion meeting, Cheyeene, WY (USA), 5-9 Nov 1990
Country of Publication:
United States
Language:
English
Subject:
08 HYDROGEN; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 33 ADVANCED PROPULSION SYSTEMS; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; ATOMS; RECOMBINATION; COPPER; CATALYTIC EFFECTS; HYDROGEN; COMBUSTION KINETICS; RAMJET ENGINES; SUPERSONIC TRANSPORT; COMPUTERIZED SIMULATION; HETEROGENEOUS CATALYSIS; HOMOGENEOUS CATALYSIS; MACH NUMBER; AIR TRANSPORT; CATALYSIS; CHEMICAL REACTION KINETICS; ELEMENTS; ENGINES; HEAT ENGINES; INTERNAL COMBUSTION ENGINES; KINETICS; METALS; NONMETALS; REACTION KINETICS; SIMULATION; TRANSITION ELEMENTS; TRANSPORT; VELOCITY; 083000* - Hydrogen- Combustion- (1990-); 080800 - Hydrogen- Properties & Composition; 400800 - Combustion, Pyrolysis, & High-Temperature Chemistry; 330103 - Internal Combustion Engines- Turbine; 320201 - Energy Conservation, Consumption, & Utilization- Transportation- Air & Aerospace

Citation Formats

Chang, S L, Lottes, S A, and Berry, G F. Copper contamination effects on hydrogen-air combustion under SCRAMJET (supersonic combustion ramjet) testing conditions. United States: N. p., 1990. Web.
Chang, S L, Lottes, S A, & Berry, G F. Copper contamination effects on hydrogen-air combustion under SCRAMJET (supersonic combustion ramjet) testing conditions. United States.
Chang, S L, Lottes, S A, and Berry, G F. Mon . "Copper contamination effects on hydrogen-air combustion under SCRAMJET (supersonic combustion ramjet) testing conditions". United States. https://www.osti.gov/servlets/purl/6126830.
@article{osti_6126830,
title = {Copper contamination effects on hydrogen-air combustion under SCRAMJET (supersonic combustion ramjet) testing conditions},
author = {Chang, S L and Lottes, S A and Berry, G F},
abstractNote = {Two forms of copper catalytic reactions (homogeneous and heterogeneous) in hydrogen flames were found in a literature survey. Hydrogen atoms in flames recombine into hydrogen molecules through catalytic reactions, and these reactions which affect the timing of the combustion process. Simulations of hydrogen flames with copper contamination were conducted by using a modified general chemical kinetics program (GCKP). Results show that reaction times of hydrogen flames are shortened by copper catalytic reactions, but ignition times are relatively insensitive to the reactions. The reduction of reaction time depends on the copper concentration, copper phase, particle size (if copper is in the condensed phase), and initial temperature and pressure. The higher the copper concentration of the smaller the particle, the larger the reduction in reaction time. For a supersonic hydrogen flame (Mach number = 4.4) contaminated with 200 ppm of gaseous copper species, the calculated reaction times are reduced by about 9%. Similar reductions in reaction time are also computed for heterogeneous copper contamination. Under scramjet testing conditions, the change of combustion timing appears to be tolerable (less than 5%) if the Mach number is lower than 3 or the copper contamination is less than 100 ppm. The higher rate the Mach number, the longer the reaction time and the larger the copper catalytic effects. 7 tabs., 8 figs., 34 refs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1990},
month = {1}
}

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