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Design Of A Ram Accelerator Mass Launch System
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723554728 Total Pages :208 pages Book Rating :4.5/5 (547 download)
Book Synopsis Design of a Ram Accelerator Mass Launch System by : National Aeronautics and Space Administration (NASA)
Download or read book Design of a Ram Accelerator Mass Launch System written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ram accelerator mass launch system has been proposed to greatly reduce the costs of placing acceleration-insensitive payloads into low earth orbit. The ram accelerator is a chemically propelled, impulsive mass launch system capable of efficiently accelerating relatively large masses from velocities of 0.7 km/sec to 10 km/sec. The principles of propulsion are based on those of a conventional supersonic air-breathing ramjet; however the device operates in a somewhat different manner. The payload carrying vehicle resembles the center-body of the ramjet and accelerates through a stationary tube which acts as the outer cowling. The tube is filled with premixed gaseous fuel and oxidizer mixtures that burn in the vicinity of the vehicle's base, producing a thrust which accelerates the vehicle through the tube. This study examines the requirement for placing a 2000 kg vehicle into a 500 km circular orbit with a minimum amount of on-board rocket propellant for orbital maneuvers. The goal is to achieve a 50 pct payload mass fraction. The proposed design requirements have several self-imposed constraints that define the vehicle and tube configurations. Structural considerations on the vehicle and tube wall dictate an upper acceleration limit of 1000 g's and a tube inside diameter of 1.0 m. In-tube propulsive requirements and vehicle structural constraints result in a vehicle diameter of 0.76 m, a total length of 7.5 m and a nose-cone half angle of 7 degrees. An ablating nose-cone constructed from carbon-carbon composite serves as the thermal protection mechanism for atmospheric transit. Aarnio, Michael and Armerding, Calvin and Berschauer, Andrew and Christofferson, Erik and Clement, Paul and Gohd, Robin and Neely, Bret and Reed, David and Rodriguez, Carlos and Swanstrom, Fredrick Unspecified Center NASA-CR-184748, NAS 1.26:184748 NGT-21-002-080...
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Book Synopsis Ram Accelerators by : Kazuyoshi Takayama
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Book Synopsis Ram Accelerators by : Kazuyoshi Takayama
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