Abstract
Development of a high-performing hybrid rocket system that employs 90% hydrogen peroxide and 3-D printable thermoplastic materials is reported. Traditionally, high-grade peroxide has been employed as a monopropellant using noble-metal catalysts to initiate thermal decomposition. Catbeds beds are expensive, heavy, and contribute no propulsive mass to the system. Catbeds exhibit limited operational lifetimes, and are often rendered inactive due to the high temperatures of thermal decomposition.
Highlights
The market for commercially designed and manufactured small spacecraft has grown enormously during the last decade, technology development has mostly centered on spacecraft bus design and miniaturization of sensor components
Hydrogen peroxide solutions with mass concentrations greater than 95% -- often referred to as high test peroxide (HTP) -- have been used extensively for propulsion applications [20]
Thermal decomposition of H2O2 using arcignition system. In this approach the peroxide flow is pre-lead by a small flow of gaseous oxygen injected into a combustion chamber lined with the 3-D printed acrylonitrile butadiene styrene (ABS) fuel
Summary
The market for commercially designed and manufactured small spacecraft has grown enormously during the last decade, technology development has mostly centered on spacecraft bus design and miniaturization of sensor components. This results is precisely the pressure ratio (1500 kPa/2500 kPa) at threshold where the Nammo motor transitions from "monopropellant" to "hybrid" combustion mode. Pressure using the De Laval flow equations, (b) Chamber pressure, (c) GOX, peroxide, nozzle exit, and fuel massflow rates, (d) Cumulative and instantaneous specific impulse values as calculated using both measured and calculated thrust levels, (e) Input power and energy levels, and (f) The oxidizer and total massflux through the fuel port. When the nozzle exit is opened to a 25:1 expansion ratio, the Isp grows to greater than 300 s, or about 30% higher than achieved under the actual test conditions
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