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  • 1
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    Technology development of a biowaste resistojet, volume 1 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The materials research effort conducted in support of a NASA-sponsored biowaste resistojet development program is summarized. The resistojet concept under development is the concentric tube design wherein the final pass of the gases through the thruster is through the resistance heated center tube. To produce high specific impulses, this center tube must operate at very high temperatures and it is this element that is most critical in the design. Because of the corrosive nature of the biowaste gases at high temperature, and because of the limited data available for many potential materials, the subject materials study was conducted.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-112149
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Performance of a 10 mlb biowaste resistojet. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Description of the thrusting performance of a 10-mlb thrust, concentric-tubes biowaste resistojet, which was life tested on hydrogen and ammonia propellants for 8000 hours. Thrusting performance is presented for H2, H2O, CH4, and CO2 as well as typical biopropellant mixtures CO2-CH4, H2O-CH4 and CO2-H2O. Using Pt-Ir alloy heater tubes, 235 and 575 seconds were obtained for water and hydrogen propellants. Overall total power efficiencies were 66%, which includes losses for a preevaporator close-coupled for the water tests. Vibration to 1.0 sq q/Hz with an overall G rms of 36, shock at 30 g's and acceleration to 8 g's simulating a launch were passed by the thrustor.
    Keywords: PROPULSION SYSTEMS
    Type: SAE PAPER 710769 , Society of Automotive Engineers, National Aeronautic and Space Engineering and Manufacturing Meeting; Sept. 28-30, 1971; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Technology Development of a Biowaste Resistojet, Volume 2 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The thruster development effort of the biowaste resistojet program is reported. Under this program, several variations of the concentric tube resistojet were built and tested. Because of the corrosive nature of the biowaste gases available for propellants, thruster effort was concentrated on the use of noble metals (platinum and its alloys) for the critical center tube heating element. This tube must operate at high temperatures. Initially the biowaste gases were projected to be CO2, CH4, H2O or H2 with only very small amounts of O2 or N2. However, during 1971, results from experimental life support tests indicated that the oxygen content would probably be in the range from 0.5 to 1.0%. To achieve the desired high specific impulses, metal temperatures as high as 1700 K (3060 R) were considered desirable goals. The first thruster, designated Mark 1, employed the alloy platinum-rhodium for the center tube. Although this material was oxidation resistant and had high strength relative to pure platinum, experimental materials tests showed that this alloy suffered from carbonyl reactions when tested on pure CO2. These reactions resulted in a depletion of rhodium and significantly weakened the tubes. The next series of thrusters were designated Mark 2 and employed platinum-iridium for the center tubes.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-112150
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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