PDF Publication Title:
Text from PDF Page: 381
Hall Thrusters 371 The ionization and excitation reaction rate coefficients in Eqs. (7.4-23) and (7.4-24) are given in Appendix E. Finally, the electron energy density is given by convection in the plasma as = 52 nekTe. (7.4-25) 7.4.1.4 Ion Current. Several methods have been used to describe the ion generation and transport in the Hall thruster models. First, the ions have been modeled as a fluid using continuity equations [54,60], where the axial motion is due to the electric field along the channel and the radial motion to the wall is determined by the ion-neutral scattering frequency. The ion current to the wall is then Iw = nino invi AwL , (7.4-26) where Aw is the wall area, L is the plasma length, in is the ion-neutral collision cross section for 90-deg scattering including elastic and charge- exchange collisions, and the velocity of the neutrals is neglected relative to the ion velocity. In PIC numerical codes, this represents the radial flux to the cell boundary where AwL becomes the cell volume. Fife [30] modeled the ion motion using a 2-D PIC code that assumed the ions and neutrals acted as discrete macro-particles in each cell. The time step in the ion-PIC code, in this case, was adjusted (to typically three orders of magnitude slower than the electron model time step) to handle the ion-motion time scales without invoking excessive computational time. Finally, the ion Vlasov equation has been used to solve for the ion generation and motion [52,53]. This has primarily been applied for investigating low- frequency oscillations on the order of the ion-characteristic time scales. In one dimension, this can be written as f+vx f+eE f =neno ive (vx vo), (7.4-27) t tM vx where f is the ion distribution function and (vx vo ) is the Dirac delta function evaluated for the ion velocity relative to the neutral velocity. The ion density is then found from ni = f(x,vx,t)dvx. (7.4-28)PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
PDF Search Title:
Fundamentals of Electric Propulsion: Ion and Hall ThrustersOriginal File Name Searched:
Goebel__cmprsd_opt.pdfDIY PDF Search: Google It | Yahoo | Bing
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
IT XR Project Redstone NFT Available for Sale: NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Be part of the future with this NFT. Can be bought and sold but only one design NFT exists. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Turbine IT XR Project Redstone Design: NFT for sale... NFT for high tech turbine design with one part 3D printed counter-rotating energy turbine. Includes all rights to this turbine design, including license for Fluid Handling Block I and II for the turbine assembly and housing. The NFT includes the blueprints (cad/cam), revenue streams, and all future development of the IT XR Project Redstone... More Info
Infinity Turbine ROT Radial Outflow Turbine 24 Design and Worldwide Rights: NFT for sale... NFT for the ROT 24 energy turbine. Be part of the future with this NFT. This design can be bought and sold but only one design NFT exists. You may manufacture the unit, or get the revenues from its sale from Infinity Turbine. Royalties go to the developer (Infinity) to keep enhancing design and applications... More Info
Infinity Supercritical CO2 10 Liter Extractor Design and Worldwide Rights: The Infinity Supercritical 10L CO2 extractor is for botanical oil extraction, which is rich in terpenes and can produce shelf ready full spectrum oil. With over 5 years of development, this industry leader mature extractor machine has been sold since 2015 and is part of many profitable businesses. The process can also be used for electrowinning, e-waste recycling, and lithium battery recycling, gold mining electronic wastes, precious metals. CO2 can also be used in a reverse fuel cell with nafion to make a gas-to-liquids fuel, such as methanol, ethanol and butanol or ethylene. Supercritical CO2 has also been used for treating nafion to make it more effective catalyst. This NFT is for the purchase of worldwide rights which includes the design. More Info
NFT (Non Fungible Token): Buy our tech, design, development or system NFT and become part of our tech NFT network... More Info
Infinity Turbine Products: Special for this month, any plans are $10,000 for complete Cad/Cam blueprints. License is for one build. Try before you buy a production license. May pay by Bitcoin or other Crypto. Products Page... More Info
| CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com | RSS | AMP |