Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Solid propellants"”.
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Thermomechanical Meso-Scale Modeling of Combustion of Heterogeneous Solid Propellants
In the final part of this dissertation, the coupled thermomechanical and propellant surface regression solver is further enhanced through addition of fluid-phase equations for transport of chemical species and temperature. A simple three-step kinetics model is used to describe the complex reactions …
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Exploration and Development of Electrically Controllable Gel and Solid Propellants
Electrically controllable propellants (ECPs) provide a new method to increase the control and functionality of rocket motors in particular solid rockets. Traditional solid rockets do not have the capability to modify the burning rate on demand during operation, which greatly limits operational …
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Measurement and Modeling of Pressure -Driven Transient Burning of Solid Propellants
… models, applicable to fine oxidizer composite propellants, are examined. The ""surface accumulation model"" supposes that components accumulate in a layer at the surface. Each component reaches an equilibrium concentration inversely proportional to its burning rate. The ""double reaction layer …
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Comparison of Cation-Anion Oxidizer Pairings in Electrically Controllable Solid Propellants
Electrically controllable solid propellants are an area of interest as a viable solution to the lack of throttle-ability in solid propellant rocket motors. Existing studies have focused on propellants compositions using hydroxyl-ammonium nitrate, ammonium nitrate, or lithium perchlorate as …
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Methods and analyses for evaluation of erosive burning in solid propellants
… models for erosive burning in composite propellants were reviewed. The experimental techniques which were cited in the literature for the measurement of erosive burning were also reviewed. Only the high-speed motion picture technique was found to have resolution sufficiently high to …
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Modifying burning rate and agglomeration size in aluminized composite solid propellants using mechanically activated metals
… reduction techniques are important field in solid propellant industry, Large agglomeration results in excessive two phase losses. Tailored composite particles has been applied to tailor aluminum particle ignition and combustion. In this research, mechanical activated aluminum magnesium …
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Theoretical Studies in Two-Phase Flow Prior to the Transition to Detonation in Granular Solid Propellants
… describing reactive two-phase flow through a gas-solid mixture is presented based upon either the concept of continuum mixture or the concept of separated-flow continuum. The resulting governing equations are solved by the method of finite differences. Details of two distinct numerical methods to …
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Data Reduction Procedure for an Experimental Method of Measuring the Velocity-Coupled Response Function of Solid Propellants
… of the velocity-coupled response function of solid-propellants from experimentally measured pressure data. The proposed velocity-coupled response function measurement apparatus consists of an end-burner combustor where the propellant sample is oscillated in a direction normal to the flow in …
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Design And Implementation Of An Emission Spectroscopy Diagnostic In A High-pressure Strand Burner For The Study Of Solid Propell
… spectroscopy to monitor combustion products of solid rocket propellant combustion can potentially yield valuable data about reactions occurring within the volatile environment of a strand burner. This information can be applied in the solid rocket propellant industry. The current study details …
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Development of low-thrust solid rocket motors for small, fast aircraft propulsion
… current UAV propulsion technologies do not meet. Solid propellant rocket motors could be used, but must be re-engineered to operate at much lower thrust and for much longer burn times than conventional small solid rocket motors. This imposes unique demands on the motor and propellant. This work …
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Combustion signatures of various energetic metal powders in a shock tube experiment
Metal additives are used in explosives and solid propellants in order to increase the energetic output and effectiveness of the explosives or fuel. Aluminum has been the primary solid fuel additive to solid fuel to improve the combustive properties of propellants. Several other metals are being …
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Development, modeling and testing of a slow-burning solid rocket propulsion system
… do not meet. To meet this need, a slow-burning solid rocket motor has been developed. Such motors require slow-burning solid propellants with tailorable burn rate. This thesis reports experimental results and combustion theory for a slow-burning solid propellant. It also describes a rocket motor …
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Characterization of a green electric solid propellant for electric propulsion
<p>"Electric solid propellants are advanced solid chemical rocket propellants that can be controlled (ignited, throttled and extinguished) through the application and removal of an electric current. These propellants are also being considered for use in ablative pulsed plasma thruster and multimode …
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Examination of the small scale slow cookoff behavior of a cast modified double base propellant
… measurements of thermally stimulated propellants can be used to improve predictive modelling and safe handling and storage procedures. The primary decomposition products of CMDB were examined using mass spectrometry for stable gas phase species and broadband absorption spectroscopy for …
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Microwave enhancement of energetic materials combustion through gas-phase flame interactions
… to all types of energetic materials, including propellants and pyrotechnics. Thus, a new robust method is needed to control energetic materials' energy release. This work explores microwave interactions with energetic material multiphase flames through interaction with the gas-phase of an …
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Towards Electrical Control Over Rocket Propellant Combustion
… performance of various propulsion systems. In solid rocket motors, active burn rate modulation has the potential to enable throttling. In spacecraft propulsion systems, electrolysis of propellants may provide a means to reduce energy requirements and eliminate the need for expensive catalysts. …
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Investigation of Fuel Geometry and Solid Fuel Combustion for Solid Fuel Ramjets
Solid fuel ramjets (SFRJs) are a simple means of sustaining supersonic flight. The utilization of solid fuels eliminates the need for moving parts or liquid delivery systems, and the solid fuels are typically inert, resulting in minimal handling requirements compared to solid propellants. …
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Particle packings and microstructure modeling of energetic materials
This dissertation explores the use of packings of frictionless hard particles as models of the microstructure of particulate heterogeneous materials. In the first part of this dissertation, we present the current mathematical framework used for understanding the properties of particle packings, as …