Propulsive Performance of Mechanically Activated Aluminum–Water Gelled Composite Propellant
15 Jan 2020-Journal of Propulsion and Power (American Institute of Aeronautics and Astronautics)-Vol. 36, Iss: 2, pp 294-301
TL;DR: In this article, the authors evaluated the propulsive performance of aluminum and water gelled composite propellant using polyacrylamide as a gelling agent for the first time.
Abstract: The present study deals with the evaluation of the propulsive performance of aluminum (Al)–water gelled composite propellant. Here, Al and water have been gelled using polyacrylamide as a gelling a...
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TL;DR: In this article , an organic/inorganic composite hydrogel was prepared by combining inorganic gellants hectorite and fumed silica with organic gellant agarose, respectively.
Abstract: Water can be used as oxidant in conjunction with metal particles to form metal–water propellant to increase the energy of propellant. For this application, water needs to be stored in form of solid and capable of becoming liquid when use. Stable and thixotropic hydrogel has good potential as water-retaining material and oxidant of metal-based propellant. In this study, we prepared organic/inorganic composite hydrogels by combining inorganic gellants hectorite and fumed silica with organic gellant agarose, respectively. The total content of the gellants can be reduced to less than 2% by adding agarose. The influence of agarose on water content, phase transition temperature, centrifugal stability and other basic physical properties of composite hydrogels were discussed. The results show that the composite hydrogels have better thixotropy and stability than pure inorganic hydrogels, and the gel–sol transformation can be realized by applying shear force or heating to the phase transition temperature. The composite hydrogels have good shear thinning ability and improved mechanical stability. Fumed silica/agarose hydrogels have better physical stability, while the thixotropy and shear thinning ability of hectorite/agarose hydrogels are better.
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TL;DR: In this paper, aluminum-water combustion was employed to synthesize alumina, along with possible co-generation of power, and the possible power generation for this method was estimated to be 6.37 MW per kg of aluminum.
TL;DR: Yamamoto et al. as discussed by the authors investigated the effect of electrical stimulation on the combustion behavior of a self-quenched solid propellant in a Rocker motor and found that the effect was negligible.
Abstract: No AccessTechnical NotesMicrothrusters’ Combustion Control Using Jellied Propellant Flowing Through an Orifice PlateYohji Yamamoto and Takeshi TachibanaYohji YamamotoNational Institute of Technology, Kitakyushu College, Kitakyushu 802-0985, Japan*Professor, Department of Creative Engineering; . Member AIAA.Search for more papers by this author and Takeshi TachibanaNational Institute of Technology, Kitakyushu College, Kitakyushu 802-0985, Japan†Specially Appointed Professor; also Professor Emeritus, Kyushu Institute of Technology, Kitakyushu 804-8550, Japan; . Senior Member AIAA.Search for more papers by this authorPublished Online:1 Feb 2023https://doi.org/10.2514/1.B38886SectionsRead Now ToolsAdd to favoritesDownload citationTrack citations ShareShare onFacebookTwitterLinked InRedditEmail About References [1] Qin Z., Wu J., Shen R. Q., Ye Y. H. and Wu L. 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Google Scholar Previous article FiguresReferencesRelatedDetails What's Popular Volume 39, Number 2March 2023 CrossmarkInformationCopyright © 2023 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-3876 to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp. KeywordsJellied PropellantCombustion ControlMicrothrusterOrifice PlateQuenchingAcknowledgmentThis work was supported by the Foundation for the Promotion of the Industrial Explosives Technology (Japan).PDF Received25 April 2022Accepted15 January 2023Published online1 February 2023
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TL;DR: In this article, the use of micron-sized aluminum (pyral, average particle size 3.66 µm) with a higher specific surface area was proposed as a good candidate to enhance the burn rate of the composite propellant.
Abstract: This paper proposes the use of micron-sized aluminum (pyral, average particle size 3.66 μm) with a higher specific surface area as a good candidate to enhance the burn rate of the composite propellant. Experiments were performed in the pressure range of 10 to 70 bar in a window bomb for measuring the burn rate. Comparison of these burn rate results with those obtained using micron- and nanosized aluminum found that the performance of pyral was in between that of micron- and nanosized aluminum. The reason for the high burn rates observed with pyral is due to the flake like appearance of pyral with a large specific surface area. It is argued that, if the specific surface area is large, then the thickness becomes the characteristic length scale. This ensures the heat release from the aluminum combustion to occur closer to the propellant surface as the thickness of pyral is in nanometers. Both the x-ray diffraction and heat of formation analyses indicated that pyral had higher purity than nanoaluminum, which...
24 citations
TL;DR: This paper is concerned primarily with providing an understanding only of the intrinsic performance capabilities of the propellants and the factors involved in selecting chemical propellants for use in heat engines of underwater missiles based only on the maximum performance available, performance figures on several candidate fuels, and means of carrying out the propellant reactions.
Abstract: T NUMBER of candidate propellants for use in propulsion of underwater missiles or torpedoes by means of a heat engine is possibly as great as is the number considered for use in rocketry. Also, in general, similar considerations apply in choosing the optimum system for a given application in either space or underwater applications. These include the important factor of performance capability, based on the intrinsic thermodynamics of the propellant, and practical considerations of suitability under use conditions. This paper is concerned primarily with providing an understanding only of the intrinsic performance capabilities of the propellants. In contrasting the processes involved in this country in the actual selection of propellants for underwater and rocket usage, it is notable that in underwater applications greater emphasis has been placed on practical considerations and that the attainment of a truly high performance capability generally has been relegated to a secondary role. In this regard, there has been a far greater tendency to apply "blue sky" techniques to achieve spectacular success in rocketry than has been true of underwater studies. In fact, quite often underwater propellant development waits on successful accomplishments in rocketry and, where possible, adapts these successes to torpedo use. Set forth are the factors involved in selecting chemical propellants for use in heat engines of underwater missiles based only on the maximum performance available, performance figures on several candidate fuels, and means of carrying out the propellant reactions.
23 citations
TL;DR: In this article, the propulsive characteristics of metal fuels in a hydro-combustion chamber are investigated in a thermodynamic approach using chemical equilibrium calculations, the thermo-chemistry of common metal fuels and water is studied and focused on magnesium.
23 citations
TL;DR: A review of metallised fuel-rich propellants (FRP) is presented in this article, which includes a discussion on the combustion mechanism and problem areas and probable remedial measures.
Abstract: This paper reviews the research work carried out in the field of metallised fuel-rich propellants (FRP). Limitations and merits of various potential metals (Al, Mg, B, Be, or Zr) as a component of FRP are discussed. The paper also includes a discussion on the combustion mechanism of metallised propellants, including problem areas and probable remedial measures. Zirconium and Ti appear to have potential to offer FRP with efficient combustion. Ideal performance is not achieved with current systems based on Al and B and further work is needed to develop FRP having all three desirable attributes, viz., ease of ignition, stable combustion and high specific impulse (I/sub sp/) in a single composition.
22 citations
TL;DR: In this paper, an experimental investigation was conducted to study the combustion characteristics of aluminum and water, gelled using polyacrylamide as gelling agent, and these propellants were tested for burn rates.
Abstract: An experimental investigation was conducted to study the combustion characteristics of aluminum and water, gelled using polyacrylamide as gelling agent. These propellants were tested for burn rates...
9 citations