Experimental study of colloid annular thrusters

Daley, Howard L.; Mahoney, John F.; Perel, Julius; Sherman, A.; Yahiku, A. Y.

doi:10.2514/6.1970-1112

Cited by 1 publication

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“…The specific charge of the emitted species is defined as (7) where is the particle charge, its mass, and is the propellant density. In a colloid thruster, it is desired to increase as much as possible the specific charge because this implies larger specific impulse values for a fixed potential drop (8) Therefore, the engine should use as little flowrate as possible, down to , the minimum flowrate at which steady-sate operation can be sustained [4] (9)…”

Section: Introductionmentioning

confidence: 99%

A Micro-Fabricated Linear Array of Electrospray Emitters for Thruster Applications

Velásquez–García

Akinwande

Martı́nez-Sánchez

2006

J. Microelectromech. Syst.

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This paper reports the design, fabrication, and experimental characterization of an internally fed linear array of electrospray emitters intended for space propulsion applications. The engine uses doped formamide as propellant and operates in the single-Taylor-cone droplet emission regime. The engine implements the concept of hydraulic and electrodynamic flow rate matching to achieve electrical control. The engine uses a set of meso-scaled silicon deflection springs to assemble the hydraulics to the electrodes, allowing to decouple the corresponding process flows. The micro-fabrication of the engine is described and novel technologies that were developed are reported. Experimental results that demonstrate cumulative uniform and steady operation are provided. Current-flowrate characteristics of the engine are in agreement with a reduced-order model. Experimental data demonstrating the low divergence of electrospray emitter arrays operated in the single Taylor Cone is in qualitative agreement with a reduced-order mode that assumes the absence of a thermalized tail in the plume.[1420]Index Terms-Electrical flow control, electrospray array, propulsion, spring deflection system, three-dimensional (3-D).

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Section: Introductionmentioning

confidence: 99%