Propellants
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. An Optimized Hybrid Rocket Motor for the SARA Platform Reentry System
Abstract: This paper has described a system design process, based on a multidisciplinary optimization technique, of a conceptual optimized hybrid propellant rocket motor. The proposed engine could be a technological option for the reentry maneuvering system of the Brazilian recoverable satellite (SARA), which was designed by the Brazilian Institute of Aerona
J. Aerosp. Technol. Manag.. Publicado em: 2012-09
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14. Water Influence in Poly(epichlorohydrin) Synthesis: An Intermediate to Energetic Propellants
Abstract: Poly(epichlorohydrin) was synthesized using anhydrous and hydrate stannic chloride, separately, as initiator. Reactions were conducted in the presence of a diolat 70°C. Polymers were characterized by Fourier Transform Infrared I Spectroscopy (FT-IR), differential scanning calorimetry (DSC), gel permeation chromatography (GPC), and hydroxyl value d
J. Aerosp. Technol. Manag.. Publicado em: 2012-03
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15. Performance evaluation of commercial copper chromites as burning rate catalyst for solid propellants
Abstract: Copper chromites are well known as burning rate catalysts for the combustion of composite solid propellants, used as a source of energy for rocket propulsion. The propellant burning rate depends upon the catalyst characteristics such as chemical composition and specific surface area. In this work, copper chromite samples from different suppliers we
J. Aerosp. Technol. Manag.. Publicado em: 2010-12
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16. Synthesis and characterization of GAP/BAMO copolymers applied at high energetic composite propellants
Abstract: The main objective of these studies was the synthesis and characterization of new energetic binders and their use in some propellant formulations. Following the working plan elaborated, the synthesis and characterization of the following compounds has been done successfully: GAP; energetic Monomer BAMO; energetic Binders; copolymer GAP/PolyBA
J. Aerosp. Technol. Manag.. Publicado em: 2010-12
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17. Preliminary analysis of hybrid rockets for launching nanosats into LEO
This work determines the preliminary mass distribution of hybrid rockets using 98% H2O2 and solid paraffin mixed with aluminum as propellants. An iterative process is used tocalculate the rocket performance characteristics and to determine the inert mass fractionfrom given initial conditions. It is considered a mission to place a 20 kg payload into a 300 km
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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18. Welding of AA1050 aluminum with AISI 304 stainless steel by rotary friction welding process
Abstract: The purpose of this work was to assess the development of solid state joints of dissimilar material AA1050 aluminum and AISI 304 stainless steel, which can be used in pipes of tanks of liquid propellants and other components of the Satellite Launch Vehicle. The joints were obtained by rotary friction welding process (RFW), which combines the heat g
J. Aerosp. Technol. Manag.. Publicado em: 2010-12
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19. Studies on compatibility of energetic materials by thermal methods
Abstract: The chemical compatibility of explosives, pyrotechnics and propellants with those materials is studied to evaluate potential hazards when in contact with other materials during production, storage and handling. Compatibility can be studied by several thermal methods as DSC (differential scanning calorimetry), TG (Thermogravimetry), VST (Vacuum stab
J. Aerosp. Technol. Manag.. Publicado em: 2010-04
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20. ADN - The new oxidizer around the corner for an environmentally friendly smokeless propellant
Abstract: The search for a smokeless propellant has encouraged scientists and engineers to look for a chlorine-free oxidizer as a substitute for AP (ammonium perchlorate). Endeavors seemed to come to an end when ADN (ammonium dinitramide) appeared in the West in the early 1990s. Although some drawbacks soon became apparent by that time, the foremost obstacle
J. Aerosp. Technol. Manag.. Publicado em: 2009-12
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21. Experimental investigation of a hybrid rocket for satellites and spacecrafts using paraffin and N2O4 as propellants / Investigação experimental de um propulsor híbrido para satélites e veículos espaciais usando parafina e N2O4 como propelentes
Foi realizada uma investigação experimental de um propulsor híbrido de 70 N de empuxo usando parafina sólida (C_20H_42) e tetróxido de nitrogênio (N_2O_4) como propelentes, a uma pressão de câmara de 25 bar. Uma vez que a parafina não apresenta ação hipergólica com o N_2O_4, a ignição do motor foi realizada mediante a injeção de uma pequena q
Publicado em: 2009
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22. Estudos do fenomeno de difusão de plastificantes em propelente composito a base de polibutadiero hidroxilado utilizado em motores foguete / A study of diffusion of plasticizer in a solid propellant based on hydroxyl-terminated polybutadiene
Os propelentes compósitos à base de polibutadieno líquido hidroxilado (PBLH) utilizados na produção dos motores foguete a propelente sólido (MFPS), desenvolvidos no Instituto de Aeronáutica e Espaço (IAE), podem sofrer alterações em suas propriedades físicas devido ao processo de difusão de plastificantes entre as interfaces das camadas de propel
Publicado em: 2009
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23. Estudo da decomposição térmica de propelente sólido compósito de baixa emissão de fumaça
The thermal decomposition of hydroxyl-terminated polybutadiene (HTPB)/ammonium nitrate (AN) based propellants, so called smokeless formulations, and raw materials were investigated by differential scanning calorimetry (DSC) and thermogravimetry (TG). The thermoanalytical profile of different components and of propellant were evaluated and the Arrhenius param
Química Nova. Publicado em: 2008
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24. Tempo de vida útil de propelentes base-simples
The purpose of this work was to determine the safe shelf life of single-base propellants. The kinetic parameters relative to the consumption of the stabilizer diphenylamine (DPA) added to the propellant were determined as a function of the storage and ageing time. High Performance Liquid Chromatography (HPLC) with spectrophotometric detection was used to det
Química Nova. Publicado em: 2008