NDLI: Investigation of a repetitive pulsed electrothermal thruster

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Investigation of a repetitive pulsed electrothermal thruster

Content Provider	NASA Technical Reports Server (NTRS)
Author	Tidman, D. A. Goldstein, S. A. Winsor, N. K. Burton, R. L. Fleischer, D.
Copyright Year	1986
Description	A pulsed electrothermal (PET) thruster with 1000:1 ratio nozzle is tested in a repetitive mode on water propellant. The thruster is driven by a 60J pulse forming network at repetition rates up to 10 Hz (600W). The pulse forming network has a .31 ohm impedance, well matched to the capillary discharge resistance of .40 ohm, and is directly coupled to the thruster electrodes without a switch. The discharge is initiated by high voltage breakdown, typically at 2500V, through the water vapor in the interelectrode gap. Water is injected as a jet through a .37 mm orifice on the thruster axis. Thruster voltage, current and impulse bit are recorded for several seconds at various power supply currents. Thruster to power ratio is typically T/P = .07 N/kW. Tank background pressure precludes direct measurement of exhaust velocity which is inferred from calculated pressure and temperature in the discharge to be about 14 km/sec. Efficiency, based on this velocity and measured T/P is .54 + or - .07. Thruster ablation is zero at the throat and becomes measurable further upstream, indicating that radiative ablation is occurring late in the pulse.
File Size	1529033
Page Count	59
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870007445
Archival Resource Key	ark:/13960/t3130rt0t
Language	English
Publisher Date	1986-08-21
Access Restriction	Open
Subject Keyword	Spacecraft Propulsion And Power Electric Propulsion Exhaust Velocity Water Injection Nozzle Flow Liquid Rocket Propellants Pulsed Jet Engines Propulsive Efficiency Electrothermal Engines Ablation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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