Combustion characteristics of nanoaluminum, liquid water, and hydrogen peroxide mixtures
- The Pennsylvania State University, Department of Mechanical and Nuclear Engineering, University Park, PA 16801 (United States)
- The Pennsylvania State University, Division of Business and Engineering, Altoona, PA 16601 (United States)
- Purdue University, School of Mechanical Engineering, West Lafayette, IN 47907 (United States)
- Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
An experimental investigation of the combustion characteristics of nanoaluminum (nAl), liquid water (H{sub 2}O{sub (l)}), and hydrogen peroxide (H{sub 2}O{sub 2}) mixtures has been conducted. Linear and mass-burning rates as functions of pressure, equivalence ratio ({phi}), and concentration of H{sub 2}O{sub 2} in H{sub 2}O{sub (l)} oxidizing solution are reported. Steady-state burning rates were obtained at room temperature using a windowed pressure vessel over an initial pressure range of 0.24 to 12.4 MPa in argon, using average nAl particle diameters of 38 nm, {phi} from 0.5 to 1.3, and H{sub 2}O{sub 2} concentrations between 0 and 32% by mass. At a nominal pressure of 3.65 MPa, under stoichiometric conditions, mass-burning rates per unit area ranged between 6.93 g/cm{sup 2} s (0% H{sub 2}O{sub 2}) and 37.04 g/cm{sup 2} s (32% H{sub 2}O{sub 2}), which corresponded to linear burning rates of 9.58 and 58.2 cm/s, respectively. Burning rate pressure exponents of 0.44 and 0.38 were found for stoichiometric mixtures at room temperature containing 10 and 25% H{sub 2}O{sub 2}, respectively, up to 5 MPa. Burning rates are reduced above {proportional_to}5 MPa due to the pressurization of interstitial spaces of the packed reactant mixture with argon gas, diluting the fuel and oxidizer mixture. Mass burning rates were not measured above {proportional_to}32% H{sub 2}O{sub 2} due to an anomalous burning phenomena, which caused overpressurization within the quartz sample holder, leading to tube rupture. High-speed imaging displayed fingering or jetting ahead of the normal flame front. Localized pressure measurements were taken along the sample length, determining that the combustion process proceeded as a normal deflagration prior to tube rupture, without significant pressure buildup within the tube. In addition to burning rates, chemical efficiencies of the combustion reaction were determined to be within approximately 10% of the theoretical maximum under all conditions studied. (author)
- OSTI ID:
- 21081135
- Journal Information:
- Combustion and Flame, Vol. 154, Issue 3; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
Similar Records
High-nitrogen-metal complexes as burning-rate modifiers for the aluminum-water propellant system
Study of the H + O + M reaction forming OH{sup *}: Kinetics of OH{sup *} chemiluminescence in hydrogen combustion systems
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN PEROXIDE
SOLUTIONS
PRESSURE RANGE MEGA PA 01-10
COMBUSTION
ARGON
WATER
TEMPERATURE RANGE 0273-0400 K
INTERSTITIALS
ALUMINIUM
EFFICIENCY
PRESSURE RANGE KILO PA
STOICHIOMETRY
PRESSURE DEPENDENCE
PRESSURE RANGE MEGA PA 10-100
STEADY-STATE CONDITIONS
FLAMES
PRESSURIZATION
VELOCITY
COMBUSTION PROPERTIES
ABUNDANCE
Nanoaluminum
Burning rate