Analysis and numerical modeling of a 20W microwave electrothermal thruster

En Yu Gao, Sven G. Bilen, Shu Xing Yang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The microwave electrothermal thruster (MET) is an electric propulsion device that uses an electromagnetic resonant cavity within which free-floating plasma is ignited and sustained in a propellant gas. The thrust is generated when the heated propellant gas is exhausted out of a gas-dynamic nozzle. For an empty cavity without any perturbing regions-e.g., dielectric regions or antenna regions-it is fairly straightforward to accurately calculate the cavity's resonant frequency and describe the electric field intensity distribution within the cavity. However, actual METs do contain perturbing regions, which means that analytical solutions are no longer possible to fully characterize the device. Hence, the numerical methods to simulate the electric field intensity and distribution within the resonant cavity were employed. The simulation results are that with the cap height increasing, the resonant frequency and electric field strength decrease, also increasing the permittivity of dielectric material causes decreasing the resonant frequency and electric field strength. A decrease in resonant frequency and maximum electric field strength, and an increase in resonant bandwidth, were observed with increasing antenna depth. Rounding an antenna of a given depth equals decreasing the depth.

Original languageEnglish (US)
Pages (from-to)324-330
Number of pages7
JournalJournal of Beijing Institute of Technology (English Edition)
Volume19
Issue number3
StatePublished - Sep 1 2010

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Microwaves
Electric fields
Natural frequencies
Cavity resonators
Antennas
Propellants
Electric propulsion
Gas dynamics
Gases
Nozzles
Numerical methods
Permittivity
Plasmas
Bandwidth

All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

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abstract = "The microwave electrothermal thruster (MET) is an electric propulsion device that uses an electromagnetic resonant cavity within which free-floating plasma is ignited and sustained in a propellant gas. The thrust is generated when the heated propellant gas is exhausted out of a gas-dynamic nozzle. For an empty cavity without any perturbing regions-e.g., dielectric regions or antenna regions-it is fairly straightforward to accurately calculate the cavity's resonant frequency and describe the electric field intensity distribution within the cavity. However, actual METs do contain perturbing regions, which means that analytical solutions are no longer possible to fully characterize the device. Hence, the numerical methods to simulate the electric field intensity and distribution within the resonant cavity were employed. The simulation results are that with the cap height increasing, the resonant frequency and electric field strength decrease, also increasing the permittivity of dielectric material causes decreasing the resonant frequency and electric field strength. A decrease in resonant frequency and maximum electric field strength, and an increase in resonant bandwidth, were observed with increasing antenna depth. Rounding an antenna of a given depth equals decreasing the depth.",
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Analysis and numerical modeling of a 20W microwave electrothermal thruster. / Gao, En Yu; Bilen, Sven G.; Yang, Shu Xing.

In: Journal of Beijing Institute of Technology (English Edition), Vol. 19, No. 3, 01.09.2010, p. 324-330.

Research output: Contribution to journalArticle

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AU - Bilen, Sven G.

AU - Yang, Shu Xing

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N2 - The microwave electrothermal thruster (MET) is an electric propulsion device that uses an electromagnetic resonant cavity within which free-floating plasma is ignited and sustained in a propellant gas. The thrust is generated when the heated propellant gas is exhausted out of a gas-dynamic nozzle. For an empty cavity without any perturbing regions-e.g., dielectric regions or antenna regions-it is fairly straightforward to accurately calculate the cavity's resonant frequency and describe the electric field intensity distribution within the cavity. However, actual METs do contain perturbing regions, which means that analytical solutions are no longer possible to fully characterize the device. Hence, the numerical methods to simulate the electric field intensity and distribution within the resonant cavity were employed. The simulation results are that with the cap height increasing, the resonant frequency and electric field strength decrease, also increasing the permittivity of dielectric material causes decreasing the resonant frequency and electric field strength. A decrease in resonant frequency and maximum electric field strength, and an increase in resonant bandwidth, were observed with increasing antenna depth. Rounding an antenna of a given depth equals decreasing the depth.

AB - The microwave electrothermal thruster (MET) is an electric propulsion device that uses an electromagnetic resonant cavity within which free-floating plasma is ignited and sustained in a propellant gas. The thrust is generated when the heated propellant gas is exhausted out of a gas-dynamic nozzle. For an empty cavity without any perturbing regions-e.g., dielectric regions or antenna regions-it is fairly straightforward to accurately calculate the cavity's resonant frequency and describe the electric field intensity distribution within the cavity. However, actual METs do contain perturbing regions, which means that analytical solutions are no longer possible to fully characterize the device. Hence, the numerical methods to simulate the electric field intensity and distribution within the resonant cavity were employed. The simulation results are that with the cap height increasing, the resonant frequency and electric field strength decrease, also increasing the permittivity of dielectric material causes decreasing the resonant frequency and electric field strength. A decrease in resonant frequency and maximum electric field strength, and an increase in resonant bandwidth, were observed with increasing antenna depth. Rounding an antenna of a given depth equals decreasing the depth.

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