To solve the problems associated with micron-sized aluminum (Al), including sintering, agglomeration, and slag deposition during combustion of aluminized propellants, aluminum–lithium (Al-Li) alloy, prepared by introducing a small amount Li (1.0 wt.%) into Al, was used in place Al. Then, ignition characteristics single Al-Li alloy particles were investigated detail using self-built experimental apparatus multiple characterization methods. The probability, delay time, flame propagation rate,...

Abstract The development of efficient and earth‐abundant water‐splitting electrocatalysts is great importance for energy conversion storage technologies. In this study, surface‐activated amorphous Fe x B catalysts, Fe–B–O@Fe 2 Fe–B–O@FeB , are synthesized remarkable activity the oxygen evolution reaction (OER) achieved, e.g., delivering a current density 10 mA cm −2 at overpotential 260 mV with Tafel slope 57.9 dec −1 OER in alkaline electrolyte. Iron oxide/hydroxide oxidized borate species...

Nanosizing and alloying of aluminum (Al) promisingly improve ignition combustion performance Al-based propellants. To aim this, lased-induced characteristics micro/nano-Al aluminum@nickel (Al@Ni) alloy powders at elevated pressures (0.1–3.0 MPa) were investigated the pressure effect on these was correspondingly evaluated. Comparative results demonstrate that nanosizing significantly shorten delay total burn time pressures, with reduction 98.04% 52.28% 1.0 MPa for nano-Al Al@Ni compared to...

It is vital to measure combustion temperature define models accurately. For single fuel particles in powder-fueled ramjets, their size distribution ranges from submicron submillimeter, and burn time short millisecond order. Moreover, the radiation intensity of different types significantly oscillated with several orders magnitude. Current measurement technology facing this challenge. This paper proposes a highly spatiotemporal resolved pyrometry by coupling single-point photomultiplier tube...

Abstract To improve the ignition and combustion performance of aluminum, complementary metal is introduced into it to form binary alloy like Al−Mg, Al−Ti, Al−Zr Al−Li. This paper mainly investigated preparation, characterization, ignition, characteristics Al−Mg powder. Melt atomization technique was used produce spherical powder containing 20 % mass content Mg composition. The crystalline structure, morphology, element distribution, thermal were characterized by XRD, TEM, SEM, EDS, TG‐DSC....

n-Decane-based nanofluid fuels could be one of the most promising alternative as aviation kerosene for aerospace application. However, physical and heat-transfer properties n-decane-based nanofuels have been rarely studied, influence concentration nanoparticles on evaporation characteristics has sparsely investigated. This paper investigated graphite/n-decane emphasized effect adding graphite nanoplatelets (GNPs) these characteristics. It was found that there are a linear increase density...

The mixed aerosols formed by fly ash and ammonium sulfate have a vital impact on the scattering characteristics of atmosphere. This paper proposes to investigate an individual optically levitated aerosol using coupled laser levitation measuring apparatus. were first prepared characterized multiple techniques. results demonstrated that particles completely encapsulated crystals rough porous surface ash, resembling “core-shell” structure. Moreover, columnar exhibit highest regularity when...

Aluminum/tetrahydrodicyclopentadiene/oleic acid (Al/JP-10/OA) nanofluid fuel is considered a potential for aircraft powered by aviation turbine engines. However, an optimized formula Al/JP-10/OA system inducing secondary atomization and micro-explosion effect improving the burning performance needs to be developed. With this aim, in work, combustion characteristics of pure JP-10, JP-10/OA, JP-10/Al, were experimentally tested, comparative analysis was conducted. Specifically, influence...

Al-Mg-Li ternary alloy particles can be a promising metal additive to replace aluminum in solid propellants improve combustion efficiency by reducing agglomeration during combustion. In this paper, was prepared and its basic physical chemical characterization parameters were obtained SEM-EDS, ICP-AES, XRD analysis. The ignition characteristics of single under different pressures investigated using self-developed experimental setup. process flame structure significantly affected the...

This paper presents a comparative study on the laser-induced ignition and combustion characteristics between nanometer-sized aluminum (nano-Al) micron-sized (micro-Al) powder stacks. Six different sizes of Al powders (56.0 nm, 74.4 93.4 nm for nano-Al 2.9 μm, 6.1 10.8 μm micro-Al) were selected to conduct experiments, at same operation conditions in static air flow with atmospheric temperature pressure 55% relative humidity. The results demonstrated that delay time is much lower than...

Abstract This paper presents the experiments and numerical calculations on laser‐induced ignition of single micron‐sized aluminum particle in an atmospheric pressure air flow at low Reynolds number. Experimental results demonstrate that radiation intensity particle, during ignition, experiences first sharp rising, stable equilibrium second steep rising stages. A simplified analytical model was built numerically solved. Numerical show three distinctive stages represent heating, melting...

The n-decane fuel/n-decane-based nanofluid fuel could be one of the most promising alternative fuels as aviation kerosene for aerospace application. This paper proposes Al/n-decane with surfactant sorbitan monooleate (SP-80) and investigates size effect Al nanoparticle (SA, 56.0 nm; SB, 74.4 nm,; SC, 93.4 nm) on its dispersion stability, physical properties, electrostatic breakup performance. Dynamic light scattering (DLS) measurements numerical calculations particle collision demonstrate...

Hydrogen peroxide (H2O2) can be considered as a sterilant or green propellant. For common use in industrial application, spray is an effective method to form fine H2O2 droplets. In this paper, electrostatic atomization based on the configuration of needle ring electrodes proposed produce by minimizing its surface tension. The breakup performances ligaments improved increasing electric field intensity, reducing nozzle size, and adjusting suitable volume flow rate. smallest average diameter...