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Results for “Low Thrust”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Multi-Objective Reinforcement Learning for Low-Thrust Transfer Design between Periodic Orbits
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Multi-Objective Low-Thrust Trajectory Optimization With Robustness to Missed Thrust Events
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Efficient Computation of Optimal Low Thrust Perturbed Orbit Transfers
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Low-thrust Transfers to Candidate Near-rectilinear Halo Orbits Facilitated by Invariant Manifolds
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Multi-objective Reinforcement Learning for Low-thrust Transfer Design Between Libration Point Orbits
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Exploring the Low-Thrust Transfer Design Space in an Ephemeris Model via Multi-Objective Reinforcement Learning
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Biowaste resistojet propellant system biological and functional analysis, task 3
Exhaust flow contamination aspects of the biowaste resistojet are studied by evaluating effects of operating pressure, temperature and composition. Biowaste propellant mixtures considered are comprised of: (1) The Sabatier reactor effluent; (2) the effluent of the cabin carbon dioxide molecular sieve; and (3) water and water vapor from various sources. Results show that plume shapes of resistojet thrusters in the 25 to 100 mlb range exhibit greater apex angles for a given density contour than a scaled inviscid jet. Operation at low thrust, low pressure and high temperature accentuates this pluming due to viscous effects in the nozzle flow. Since the biowaste resistojet effluent is traveling at high velocity in the plume away from the aircraft it is found to be a superior method of damping than the ambient venting.
The Selection of Propellers for High Thrust at Low Airspeed
Problem of improving thrust at low speeds is primarily one of reducing angle of attack of operation of sections to improve L/D or reducing blade helix angle. An analysis, based on recent propeller data, is presented for determining improvements in thrust or efficiency which could be obtained by increased number of blades, increased blade width, increased diameter, dual rotation, and two-speed gearing. All methods were found very effective, particularly two-speed gearing.