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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07 May 1990
TL;DR: In this paper, the effect of an arcjet plume on the performance of onboard reflector antennas is studied and the trajectory, phase, amplitude, and polarization of the high-frequency ray field transmitted through the plume are numerically computed based on the laws of geometrical optics.
Abstract: The effect of an arcjet plume on the performance of onboard reflector antennas is studied. The arcjet plume is modeled as an inhomogeneous scatterer with a smoothly varying refractive index. The spatial distribution of the refractive index is related to the measured electron density data based on the cold plasma model. Since the plume size of interest is more than several wavelengths in extent, geometrical optics is used to calculate the microwave propagation through the plume. The trajectory, phase, amplitude, and polarization of the high-frequency ray field transmitted through the plume are numerically computed based on the laws of geometrical optics. Once the ray optics field transmitted through the plume on the near-field aperture is found, the far-field pattern of the antenna can be calculated by a ray-tube integration scheme. Results obtained with the proposed method are presented. >
9 citations
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27 Jun 2013
9 citations
TL;DR: In this paper, the dependence of growth rate and quality of diamond films on input power to the plasma torch was investigated using a d.c. arcjet chemical vapor deposition (CVD) system, and the results were analyzed considering the kinetics of gas activation taking place in the CVD process.
9 citations
23 Jun 2008
TL;DR: In this paper, the electromagnetic flow control was numerically investigated to clarify the electromagnetic effects measured in a one-kilowatt argon arcjet windtunnel, and it was found that an uniform pre-ionized flow assumption was unacceptable to reproduce the measured electromagnetic drag increase because the strong Hall effect in the flow dissipates the circumferential current.
Abstract: The electromagnetic flow control was numerically investigated to clarify the electromagnetic effects measured in a one-kilowatt argon arcjet windtunnel. As a result, an uniform pre-ionized flow assumption was found to be unacceptable to reproduce the measured electromagnetic drag increase because the strong Hall effect in the flow dissipates the circumferential current. Contrastingly, in the simulation using an artificial pre-ionized flow with a distinct insulative plume boundary, a strong Hall electric field is induced and the flow is electromagnetically controllable through E×B drift. To verify this result, a one-kilowatt class arcjet windtunnel is solved instead of such an artificial plume environment using the Naiver-Stokes equations with thermochemical nonequilibrium and steady magnetohydrodynamic equations. As a result, the simulated arcjet plume has a strong electroconductive non-uniformity in the radial direction, and this non-uniformity was found to activate a strong Hall electric field and the resulting electromagnetic flow control even if the Hall parameter is over 40.
9 citations
TL;DR: In this paper, a successful attempt has been made to gain optical access to the inside of an arcjet nozzle without changing internal thruster design or affecting performance characteristics, and both fiber optics and small open holes have been used for emission spectroscopy of a small, confined, high-temperature plasma source.
Abstract: A successful attempt has been made to gain optical access to the inside of an arcjet nozzle without changing internal thruster design or affecting performance characteristics. Both fiber optics and small open holes have been used for emission spectroscopy of a small, confined, high-temperature plasma source. The plasma was found to be in a highly nonequilibrium state, with electron excitation temperatures more than double the rotational or vibrational temperatures.
8 citations