RFCCD Microthuster Performance via Numerical Simulation

Alexeenko, Alina; Hrbud, Ivana

doi:10.2514/6.2008-962

Cited by 3 publications

(4 citation statements)

References 15 publications

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“…Both types of power consumption increase as a function of pressure and voltage as expected from earlier studies. 21,22 It is of note that the P f increases with applied potential much faster than P abs . The total absorbed power increases in a near linear fashion above potentials of approximately 75 V at which the discharges transition and will be discussed in more detail below.…”

Section: Plasma-neutral Heat Transfer Effectsmentioning

confidence: 99%

“…1 r ∂ ∂r kr ∂T ∂r +q = 0 (22) While k = f (T ), it is assumed constant at each timestep and thus can be removed from the derivative. When numerically solving for the temperature k becomes solely a function of radius, and is calculated using values from the previous timestep.…”

Section: Neutral Temperature Modelmentioning

confidence: 99%

“…Our previous work [21][22][23] investigated the effects of pressure and frequency on performance of a 50W RFCCD microthruster. This was done at a constant applied potential and inner radius corresponding to conditions similar to that in the experiments.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasma-Neutral Heat Transfer in Coaxial RF Argon Discharges

Alexeenko

Hrbud

2008

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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Section: Plasma-neutral Heat Transfer Effectsmentioning

confidence: 99%

Section: Neutral Temperature Modelmentioning

confidence: 99%

See 1 more Smart Citation

Plasma-Neutral Heat Transfer in Coaxial RF Argon Discharges

Alexeenko

Hrbud

2008

44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference &Amp;amp; Exhibit

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“…6,7 The PIC/MCC method is used to determine plasma characteristics within the coaxial discharge annulus. The argon collision model employed in the computations includes electron-neutral ionization, charge exchange, lumped excitation, and elastic scattering.…”

Section: Introductionmentioning

confidence: 99%

Resurrecting Limited War Theory

Nalls¹

2008

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information Operationsand Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY) 08-07-2008 REPORT TYPE Technical Paper DATES COVERED (From -To) TITLE AND SUBTITLE Experimental and Computational SPONSOR/MONITOR'S NUMBER(S) AFRL-RZ-ED-TP-2008-284 DISTRIBUTION / AVAILABILITY STATEMENTApproved for public release; distribution unlimited (PA #08272A). SUPPLEMENTARY NOTESFor presentation at the 26 th International Symposium on Rarefied Gas Dynamics, Kyoto, Japan, 21-25 July 2008. ABSTRACTA prototype RF plasma micro-thruster has been investigated numerically and experimentally. The experimental results were obtained on a thrust stand capable of micro-Newton resolution. Thrust and mass flow (hence specific impulse) were measured for an argon propellant at mass flows ranging from 0.4 to 5.5 mg/sec. An increase to the cold gas thrust of up to 20% was observed for a discharge frequency of 100 MHz and an input power of 70 W. Propulsive efficiency was seen to increase both experimentally and numerically for increasing mass flow and decreasing discharge frequency. Abstract. A prototype RF plasma micro-thruster has been investigated numerically and experimentally. The experimental results were obtained on a thrust stand capable of micro-Newton resolution. Thrust and mass flow (hence specific impulse) were measured for an argon propellant at mass flows ranging from 0.4 to 5.5 mg/sec. An increase to the cold gas thrust of up to 20% was observed for a discharge frequency of 100 MHz and an input power of 70 W. Propulsive efficiency was seen to increase both experimentally and numerically for increasing mass flow and decreasing discharge frequency.

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Numerical Investigation of Power Transmission Efficiency in a RF Plasma

Ashok

Alexeenko

2009

47th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Capacitively coupled radio frequency discharges are used in a variety of applications in which the power transmission efficiency of the discharge is an important performance parameter. While previous research addressed the discharge properties and discharge modeling, little analysis has been done on the dependence of the power transmission efficiency on main discharge paremeters such as applied voltage, operating frequency and pressure. To investigate the effects of a dual frequency waveform on the power transmission efficiency, Particle-InCell/Monte-Carlo Collison (PIC/MCC) methods are used to simulate RF co-axial plasma discharge. Plasma characteristics are studied for a range of operating pressures and radii, as electrode voltages were varied between 0, 100 and 250V. The investigation concludes that the addition of a RF power source to the outer electrode increase power transmission efficiency by about 100%. Power transmission efficiency increases with a decrease in radius and an increase in pressure, in general. Low-frequency high-voltage power source combination is found to generate a more efficient discharge than a high-frequency high-voltage power source.

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RFCCD Microthuster Performance via Numerical Simulation

Cited by 3 publications

References 15 publications

Plasma-Neutral Heat Transfer in Coaxial RF Argon Discharges

Plasma-Neutral Heat Transfer in Coaxial RF Argon Discharges

Resurrecting Limited War Theory

Numerical Investigation of Power Transmission Efficiency in a RF Plasma

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