Topic
Arcjet rocket
About: Arcjet rocket is a research topic. Over the lifetime, 1121 publications have been published within this topic receiving 9687 citations. The topic is also known as: Arcjet.
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01 Jul 1996
12 citations
01 Jul 1992
TL;DR: In this article, the use of laser-induced fluorescence to obtain spatially resolved measurements of propellant velocities and temperatures in electric thruster plumes is discussed, with emphasis on two innovations of the technique, namely simultaneous recording of the optogalvanic signal in a hollow cathode lamp for the purpose of calibrating Doppler shifts, and two-beam multiplexing to allow the measurement of two velocity components at once.
Abstract: The use of laser-induced fluorescence to obtain spatially resolved measurements of propellant velocities and temperatures in electric thruster plumes is discussed, with emphasis on two innovations of the technique, namely simultaneous recording of the optogalvanic signal in a hollow cathode lamp for the purpose of calibrating Doppler shifts, and two-beam multiplexing to allow the measurement of two velocity components at once. It is also shown how information on plume fluctuations can be obtained from the multiplxed LIF data. The techniques are demonstrated on the plume from a low power arcjet, operated on argon, and its extension to the measurement of ion velocities in electrostatic ion thrusters and stationary plasma thrusters is discussed.
12 citations
TL;DR: In this paper, two different approaches are presented to predict the cathode sheath potential for a 1-kW hydrazine arcjet operating at 10 A, 50 mg/s.
Abstract: We present two different approaches to predict the cathode sheath potential necessary to account for the total voltage in a 1-kW hydrazine arcjet operating at 10 A, 50 mg/s. The first approach is a jump condition cathode sheath model, which treats the cathode surface conditions and properties at the sheath edge. The input of the sheath model includes attachment area and the temperature at the cathode, and the near-cathode bulk plasma properties, which are obtained from a nonequilibrium arcjet model. The sheath potential from the sheath model is approximately -30 V for a pure tungsten cathode with 2 x 10 -8 m 2 attachment area, and 3680 K cathode tip temperature. The second approach is a detailed nonneutral plasma cathode sheath model, which employs Poisson's equation to calculate the charge distribution in the sheath and Saha's equilibrium equation to calculate species densities in the ionization region. The sheath voltage, electron temperature, and electron number density predictions from the two cathode models agree well. However, the cathode surface electric field differs by a factor of 10 or more
12 citations
12 citations