Near-Field Measurement and Modeling Results for Flight-Type Arcjet: Hydrogen Atom

Autor:	Yoshifumi Gotoh, Iain D. Boyd, Teresa A. Moore, Ideo Masuda, Mark W. Crofton
Rok vydání:	2001
Předmět:	Materials science Hydrogen business.industry Nozzle Aerospace Engineering chemistry.chemical_element Near and far field Plume Arcjet rocket Laser linewidth Optics chemistry Space and Planetary Science Direct simulation Monte Carlo Atomic physics business Doppler broadening
Zdroj:	Journal of Spacecraft and Rockets. 38:417-425
ISSN:	1533-6794 0022-4650
Popis:	Hydrogen atoms were probed in the near-e eld plume of a 1.8-kW e ight-type arcjet thruster, using two-photon laser-induced e uorescence. The arcjet was operated on an N 2/H2 gas mix simulating hydrazine decomposition products. Thevelocity distributionsof Hatoms were used to obtain theirtranslational temperatures. Comparisons of the laser-induced e uorescence signal intensity, radial linewidth, and derived density distribution with direct simulation Monte Carlo results were in good agreement except near the nozzle exit plane. A relatively weak signal was observed near the exit plane, while the maximum signal was unexpectedly obtained 0.8 cm downstream. Fluorescence quenching, linewidth variation, and self-absorption effects are proposed to account for most of the discrepancy in signal intensity. The results improve the knowledge of near-e eld e ow parameters for the arcjet and ultimately enhance the accuracy and understanding of predicted plume impingement torques and other arcjet plume phenomenology on spacecraft.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::dbff61b656f8049f72ef0e2ad02afdde https://doi.org/10.2514/2.3700 Zobrazit plný text záznamu