每年出版 6 期
ISSN 打印: 2150-766X
ISSN 在线: 2150-7678
Indexed in
COMBUSTION OF PTFE-BORON COMPOSITIONS FOR PROPULSION APPLICATIONS
摘要
An experimental study was conducted to evaluate the potential of solid fuels based on PTFE and boron mixtures for hybrid rocket motor applications. Specifically, a processing technique based on sintering was studied to determine the viability of these fuels. Sintering of the fuels provided reasonable mechanical properties to allow for exploration of these fuels without the addition of performance-robbing ingredients. Linear regression rates of sintered and unsintered fuels were collected in a diffusion flame setting with gaseous oxygen as the oxidizing component demonstrating that the sintering process had no effect. This family of fuels has shown that they will not combust at atmospheric pressure unless pure oxygen is present. However, sintered fuels with boron loadings greater than or equal to 25% by weight do self-propagate at atmospheric pressure once ignited in the presence of oxygen, whereas unsintered fuels do not self-propagate unless they have boron loadings greater than or equal to 30% by weight. At pressures up to 12 MPa, fuels containing 10% by weight boron would not self-propagate in a nitrogen atmosphere, whereas fuels containing 20% boron would self-propagate at pressures greater than about 5.7 MPa. Preliminary lab-scale rocket motor firings demonstrate the viability of a hybrid rocket based on PTFE and boron mixtures. In addition, they demonstrate that the regression rates of these fuels show dependencies on pressure and possibly oxidizer flow rate as well. Thermochemical analysis suggests that these fuels offer a significant performance benefit in terms of density impulse, while also presenting a significant technological challenge due to excessively high flame temperatures for some mixtures.
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Connell Terrence L., Risha Grant A., Yetter Richard A., Roberts Colin W., Young Gregory, Boron and Polytetrafluoroethylene as a Fuel Composition for Hybrid Rocket Applications, Journal of Propulsion and Power, 31, 1, 2015. Crossref
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Young Gregory, Roberts Colin W., Stoltz Chad A., Ignition and Combustion Enhancement of Boron with Polytetrafluoroethylene, Journal of Propulsion and Power, 31, 1, 2015. Crossref
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Young Gregory, Hromisin Scott, Loeffler Sam, Connell Terrence L., Effect of Oxidizer Type on Solid Fuel Combustion, Journal of Propulsion and Power, 36, 2, 2020. Crossref
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Valluri Siva Kumar, Schoenitz Mirko, Dreizin Edward, Boron-Metal Fluoride Reactive Composites: Preparation and Reactions Leading to Their Ignition, Journal of Propulsion and Power, 35, 4, 2019. Crossref
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Young Gregory, Connell Terrence L., Fennell Kyle, Possehl Steve, Baier Michael, Examining Port Geometry/Solid Loading for Additively Manufactured Fuels in Hybrid Rockets, Journal of Propulsion and Power, 37, 2, 2021. Crossref
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Finn Matthew T., Chaloux Brian L., Epshteyn Albert, Exploring the Effects of Reaction Conditions on Morphology and Stability of Sonochemically Generated Ti–Al–B Fuel Powders, Energy & Fuels, 34, 9, 2020. Crossref
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Lebedeva E. A., Astaf’eva S. A., Istomina T. S., Modification of Boron Powders Used in Energy-Saturated Materials, Russian Journal of Physical Chemistry B, 16, 2, 2022. Crossref
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Mursalat Mehnaz, Schoenitz Mirko, Dreizin Edward L., Effect of particle morphology on reactivity, ignition and combustion of boron powders, Fuel, 324, 2022. Crossref