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  • PROPULSION SYSTEMS  (4)
  • FLUID MECHANICS  (2)
  • SPACECRAFT PROPULSION AND POWER  (1)
  • 1970-1974  (7)
  • 1
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    Electrostatic Propulsion Beam Divergence Effects on Spacecraft Surfaces. Volume 2, Addendum 1: Ion Time-of-flight Determinations of Doubly to Singly Ionized Mercury Ion Ratios from a Mercury Electron Bombardment Discharge (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The analysis of ion exhaust beam current flow for multiply charged ion species and the application to propellant utilization for the thruster are discussed. The ion engine in use in the experiments is a twenty centimeter diameter electromagnet electron bombardment engine. The experimental technique to determine the multiply charged ion abundance ratios using ion time of flight is described. An analytical treatment of the discharge action in producing various ion species has been carried out.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-131841 , TRW-11985-6002-RU-01-VOL-2-ADD
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Experimental study of nozzle wall boundary layers at Mach numbers 20 to 47 (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The nozzle wall boundary layer of an M-50 helium tunnel was investigated with pitot pressure, total temperature, skin friction, and wall heat transfer measurements at five stations and hot wire measurements at two stations. The results indicated that the boundary layer was turbulent with a thick viscous sublayer. Pressure gradients were observed across the boundary layer; the effect of these gradients on the equations of motion are discussed. The direct skin friction measurements were higher than expected from empirical predictions; the Reynolds analogy factors however were lower than expected. Hot wire measurements indicated mass flow fluctuations as large as 80 percent of the local mean mass flow at the edge of the viscous sublayer with a maximum value relative to the edge mass flow of about 15 percent at gamma about equal to 0.8.
    Keywords: FLUID MECHANICS
    Type: NASA-TN-D-6965 , A-4359
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Solar electric propulsion/instrument/subsystems interaction study (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The interactive effects between a solar electric propulsion system and an electrically propelled scientific spacecraft were examined. The operation of the ion thrusters may impact upon the acquisition and interpretation of data by the science payload of the spacecraft. The effluents from the operation of the electric propulsion unit may also impact upon the operation of the various subsystems of the vehicle. Specific interactive effects were isolated where meaningful levels of interaction may occur. The level of impact upon elements of the science payload and other affected subsystems is examined, and avenues for the reduction or elimination of impact are defined.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-114732 , TRW-22878-6007-RU-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Charged particle measurements on a 30-CM diameter mercury ion engine thrust beam (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Measurements of both thrust ions and charge exchange ions were made in the beam of a 30 centimeter diameter electron bombardment mercury ion thruster. A qualitative model is presented which describes magnitudes of charge exchange ion formation and motions of these ions in the weak electric field structure of the neutralized thrust beam plasma. Areas of agreement and discrepancy between observed and modeled charge exchange properties are discussed.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA-CR-148293 , TRW-25781-6001-RU-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Electrostatic propulsion beam divergence effects on spacecraft surfaces, volume 3 (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Tests were conducted to determine the effects of electrostatic propulsion beam divergence effects on spacecraft surfaces. The subjects discussed are: (1) sensitive surfaces on the ATS 6 spacecraft, (2) the cesium ion source and testing facility, (3) cesium ion effects on thermophysical properties, and (4) simulated charge-exchange ion exposure. The compatibility of the ATS 6 ion engine experiment with the engineering subsystems and other experiments aboard the ATS 6 spacecraft was analyzed.
    Keywords: PROPULSION SYSTEMS
    Type: NASA-CR-136933 , TRW-11985-6003-RU-00
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Ion time-of-flight determinations of doubly to singly ionized mercury ion ratios from a mercury electron bombardment discharge (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Doubly to singly charged mercury ion ratios in electron bombardment ion thruster exhaust beams have been determined as functions of bombardment discharge potential, thrust beam current, thrust beam radial position, acceleration-deceleration voltage ratio, and propellant utilization fraction. A mathematical model for two-step ionization processes has been derived, and calculated ion ratios are compared to observed ratios. Production of Hg(++) appears to result primarily from sequential ionization of Hg(+) in the discharge. Experimental and analytical results are presented, and design, construction, and operation features of an electrostatic deflection ion time-of-flight analyzer for the determination of the above-mentioned ratios are reviewed.
    Keywords: PROPULSION SYSTEMS
    Type: AIAA PAPER 73-1055 , Electric Propulsion Conference; Oct 31, 1973 - Nov 02, 1973; Lake Tahoe, NV
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Nozzle wall boundary layers at Mach numbers 20 to 47 (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Nozzle wall hypersonic boundary layers in helium tunnel, presenting skin friction measurements and heat transfer rates
    Keywords: FLUID MECHANICS
    Type: AIAA PAPER 71-161 , AEROSPACE SCIENCES MEETING; Jan 25, 1971 - Jan 27, 1971; NEW YORK, NY
    Format: text
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    NASA TECHNICAL REPORTS
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