Carbon nanotubes for nano particle field extraction thruster
Since the nanoparticles are charged electrostatically rather than ionized as in ion or Hall thrusters, greater reliability and efficiency can be achieved. Unfortunately, not much information has been released on how it manages to transport particles to the charging pad. The prefix refers to their method of particle transportation, a wet-nanoFET uses liquid whereas a dry does not. While a liquid is the easiest way to transport the particles, it can form tiny cones Taylor cones and charged droplets colloids , which severely affect a nanoFET's ability to fine tune its thrust. This results in a modular and geometrically scaleable propulsion system, from watts to megawatts, allowing the decoupling of thruster design from spacecraft design. This phenomenon provides the dry-NanoFET design with added flexibility to tune its performance. Posted: Mar 26, Nanotechnology propulsion technology for space exploration Nanowerk Spotlight Most of today's rocket engines rely on chemical propulsion. While slot orifice geometries may be easier to microfabricate than large numbers of circular orifices, the trade-off must be evaluated between manufacturing ease and the reduction in the maximum allowable charging electric field relative to an array of circular orifices. He has been interviewed for radio, professional organizations. Real rocket scientists though are actively researching new forms of space propulsion systems.
It can produce more thrust while using less power and fuel than any other electronic thrust system. While a liquid is the easiest way to transport the particles, it can form tiny cones Taylor cones and charged droplets colloidswhich severely affect a nanoFET's ability to fine tune its thrust.
This is mainly because cylindrical particles gain much more charge than spherical particles, as they stand on end when being charged.
A new EP concept proposes to utilize electrostatically charged and accelerated nanoparticles as propellant. The very low and highly controllable thrust levels provided by various electric propulsion technologies enable a new category of missions which otherwise would not be possible.
Much of the engine is etched directly onto a wafer-thin piece of silicon via micro-electromechanical systems technologies, known as MEMS, that are more commonly used in the semiconductor industry. Initially, non-conductive liquids with low surface tension and viscositysuch as cSt silicon oil, were found to be able to withstand a large electro-magnetic field without forming colloids.
From Equation 4such high internal efficiencies associated with nanoFET translate to thrust-to-power ratios, particularly at low Isp, that are greater than state-of-the-art EP thrusters. This phenomenon provides the dry-NanoFET design with added flexibility to tune its performance.
For low-Isp, high thrust-to-power maneuvers, nanoFET would outperform arcjets by achieving greater thrust for the same power.
Particle accelerator thruster
The system is also very flexible with regard to the size and type of particles that can be used. This phenomenon provides the dry-NanoFET design with added flexibility to tune its performance. To start, it transports cylindrical particles to the charging pad which then imposes a charge on the particles. A method of transporting the dry particle propellant through an ultra-fine sieve prior to the charging and accelerating stages is investigated as a method of overcoming the cohesion between the particles. Now the particle begins accelerating towards the acceleration grid until it is shot out of the nanoFET, consequently pushing the nanoFET in the opposite direction. Adhesion and cohesion models are presented along with proposed methods of overcoming each. For the liquid-NanoFET configuration, the NanoBLUE microgravity flight results suggest that the electric field threshold for liquid surface instability is increased for smaller channels.
The tiny thrusters that work much like miniaturized versions of massive particle accelerators. Without the need to ionize propellant, nanoFET does not experience charge exchange CEX collisions between high energy charged and slow moving neutral particles.
Consider a robotic probe or a freighter vehicle to a planetary body. One heavily researched area is electric propulsion EP that includes field emission electric propulsion FEEPcolloid thrusters and other versions of field emission thrusters FETs.
based on 60 review