Journal ArticleDOI
Radiative emission analysis of an expanding hydrogen arc plasma—II. Plume region diagnostics through radial emission
P.Victor Storm,Mark A. Cappelli +1 more
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TLDR
In this paper, a numerical and experimental investigation of axial emission of 1 and 5 kW radiatively-cooled hydrogen arcjet thrusters is presented, which consists of an integration of the 1-D radiative transfer equation along the arcjet centerline to predict the axial emissions spectral intensity.Abstract:
A numerical and experimental investigation of the axial emission of 1 and 5 kW radiatively-cooled hydrogen arcjet thrusters is presented. The numerical study consists of an integration of the 1-D radiative transfer equation along the arcjet centerline to predict the axial emission spectral intensity. The complete visible spectrum is modeled, taking into account graybody thermal emission from the cathode and plasma radiation from hydrogen atoms and free electrons. A collisional-radiative model is used to determine the atomic hydrogen line emission. The modeling results suggest the feasibility of determining the cathode temperature and the arc region electron number density from the measured axial emission spectrum. Experimental measurements of the axial emission spectra were performed at several operating conditions. The cathode temperature is found to be in the neighborhood of the tungsten cathode melting point and increases with arcjet power at a constant mass flow rate, suggesting an increase in the current density at the arc attachment point. The measured arc region electron number density is also found to increase with power, confirming an increasing arc current density with arcjet power. Relatively flat radial profiles of electron number density measured in the arc indicate the importance of diffusional transport processes.read more
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Journal ArticleDOI
Plasma Characterization With Terahertz Pulses
TL;DR: In this article, a terahertz (THz) time-domain spectroscopy system was proposed to simultaneously provide high time resolution and THz bandwidth coverage, which allows studying wide ranges of plasma density variations without incurring opacity.
Journal ArticleDOI
Excited state density distributions of h, c, c2, and ch by spatially resolved optical emission in a diamond depositing dc-arcjet reactor
TL;DR: In this paper, the authors used spatially resolved optical emission spectroscopy to investigate excited species in a dc-arcjet diamond depositing reactor and found all the excited species to be present in concentrations two or more orders of magnitude smaller than expected.
Journal ArticleDOI
Modeling Study on the Flow, Heat Transfer and Energy Conversion Characteristics of Low-Power Arc-Heated Hydrogen/Nitrogen Thrusters
TL;DR: In this paper, the authors investigated the effect of hydrogen content in propellants on the plasma flow, heat transfer and energy conversion characteristics of low-power arc-heated hydrogen/nitrogen thrusters (arcjets).
Journal ArticleDOI
Arcjet nozzle flow-field characterization by laser-induced fluorescence
P. Storm,Mark A. Cappelli +1 more
TL;DR: Laser-induced fluorescence of the Balmer-alpha (H(alpha)) transition of atomic hydrogen was performed within the nozzle of a 1-kW class radiatively cooled arcjet thruster operating on hydrogen and synthesized-hydrazine propellants, suggesting needed improvements in the modeling of the recombination chemistry.
Journal ArticleDOI
Flow Characterization of a Diamond-Depositing DC Arcjet by Laser-Induced Fluorescence.
TL;DR: Laser-induced fluorescence measurements of seeded nitric oxide and naturally occurring species in a diamond-depositing dc arcjet of hydrogen/argon/methane (0.8:1.0:0.005) at 25 Torr are used to determine the temperature and velocity fields in a gas jet.
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Book
CRC Handbook of Chemistry and Physics
TL;DR: CRC handbook of chemistry and physics, CRC Handbook of Chemistry and Physics, CRC handbook as discussed by the authors, CRC Handbook for Chemistry and Physiology, CRC Handbook for Physics,
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Axial emission measurements on a medium power hydrogen arcjet thruster
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