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Showing 1 to 16 of 16 for “"HTPB"”.
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The Flame Structure of AP /Htpb Sandwiches
The ultraviolet flame emissions observed in the experiments show a correspondence with the fuel-rich region of the flame, as determined with a Schvab-Zeldovich model. This is reasonable since the primary sources of ultraviolet emission in the 305--315 nm region, electronically excited OH and the CO …
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Oscillatory Behavior of Fine AP/HTPB Composite Propellants
… oscillatory combustion of wide distribution AP/HTPB composite propellants containing coarse AP and fuel-rich, fine-AP/HTPB pocket regions has been investigated experimentally and theoretically. These propellants are of special interest because they are similar to many wide distribution bi-modal …
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Combustion Studies of Laminate Propellants of AP and HTPB With UV/IR Imaging and Spectroscopic Diagnostics
A non-intrusive diagnostic technique of imaging spectroscopy has been developed and used to study vibrational-rotational transitions of HCl in order to measure associated temperatures at different locations in the gas phase and to test for thermal equilibrium. Experimental spectra have been …
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Two-Dimensional Modeling of AP/HTPB Utilizing a Vorticity Formulation and One-Dimensional Modeling of AP and ADN
… to examine the flame structure above an AP/HTPB composite propellant. This work was part of an ongoing effort to develop theoretically based, <em>a priori</em> combustion models. The improved numerical model for AP combustion utilizes a “universal” gas-phase kinetic mechanism previously …
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Solid fuel ramjet infrared signature
… (SFRJ). Solid fuels investigated were Plexiglas, HTPB, and HTPB with aluminum, silicon, boron carbide, and/or magnesium. They were tested at chamber pressures of 80-170 psia and with equivalence ratios between 0.3 and 1.4. With the plume emissivity set to 1.0, plume irradiance was found to …
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Degradation and stabilisation of diisocyanate cured polybutadiene
Hydroxyl terminated polybutadiene (HTPB) has been used as a rocket propellant binder which is required to be stored for at least twenty years. It is found that the excellent stress-strain characteristics of this propellant can be totally lost, during this long storage, due to the deterioration of …
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Design And Implementation Of An Emission Spectroscopy Diagnostic In A High-pressure Strand Burner For The Study Of Solid Propell
… together with Hydroxyl-Terminated-Polybutadiene (HTPB), a hydrocarbon polymer that is solidified using a curative after all components are homogeneously mixed. The other two propellants did not contain aluminum, but rather relied on the HTPB as a fuel source. The propellants without aluminum …
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Mechanical properties of energetic composites
… reports experiments performed on three cast RDX-HTPB composites, where quantifiable damage was introduced at high strain-rate using a Direct Impact Hopkinson Bar, and the resulting composite modulus was measured quasi-statically. The most abrupt decrease in modulus due to damage was measured for …
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Composite propellant combustion with low aluminum agglomeration
… polybutadiene (AP/HTPB) propellant formulation that results in low Al agglomeration, even at low pressures (1-30 atm). Variations in formulation—such as fine-AP/binder ratio, Al particle size, Al loading, coarse-AP size—are also examined. A fuel-rich, oxygenated …
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MULTI-SCALE MECHANICS OF COMPOSITE SANDWICH STRUCTURES WITH BIOLOGICALLY INSPIRED FIBER REINFORCED FOAM CORES: A POTENTIAL TEMPLATE FOR DEVELOPING MULTIFUNCTIONAL STRUCTURES
… and an adhesive of NH4Cl and ZnCl2 bound by HTPB and epoxy polymers. Very low power generation was demonstrated using the prototype batteries, however it was determined that the mechanical strength and energy absorbing capability were compromised, as expected from the model, indicating that …
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The development and implementation of a hybrid rocket motor thrust stand to investigate the relationship between combustion chamber pressure and graphite rocket nozzle erosion in hybrid rocket motors
… (HRMTS) was developed to perform test fires of a HTPB-N2O hybrid motor at chamber pressures between 2.07 MPa and 4.83 MPa. Supplementary research was carried out that explored hybrid motor injectors and their effects of combustion instabilities. Major milestones included, implementation of a new …
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Investigation of Fuel Geometry and Solid Fuel Combustion for Solid Fuel Ramjets
… (PMMA) and hydroxyl-terminated polybutadiene (HTPB). Investigations using two lab-scale SFRJs were conducted to determine the feasibility and performance impacts of implementing a cavity-style flame holder as a means of improving the flammability limits of a SFRJ. The results presented …
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Modifying burning rate and agglomeration size in aluminized composite solid propellants using mechanically activated metals
… are applied in propellant formulation with AP/HTPB. In order to quantify the effect of changing Mg percent. Burning rate is measured from videos captured for strand burning in windowed pressure vessel, also the agglomeration was capturing using special setup. The results showed that MA powder …
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Design And Fabrication Of A Full-featured Labscale Hybrid Rocket Engine
The design, development, integration and testing of a full-featured, Lab-Scale Hybrid Rocket Engine was not only envisioned to be the chosen method of putting student payloads into space, but to be an invaluable teaching resource. The subject of the present thesis is the analysis, design, …
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Rheology of Filled and Unfilled Polyurethanes for Reactive Extrusion-Based Applications
… between hydroxyl-terminated polybutadiene (HTPB) and isophorone diisocyanate (IPDI). When uncatalyzed at room temperature, full conversion takes place over the course of multiple weeks which necessitates an accelerated kinetic analysis. Hence, a combination of chemorheological and …