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Experimental And Theoretical Investigation Of Plume Interaction And Dynamic Behaviour Of Field Emission Electric Propulsion Thrusters
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Book Synopsis Experimental and Theoretical Investigation of Plume Interaction and Dynamic Behaviour of Field Emission Electric Propulsion Thrusters by : Lorenzo Serafini
Download or read book Experimental and Theoretical Investigation of Plume Interaction and Dynamic Behaviour of Field Emission Electric Propulsion Thrusters written by Lorenzo Serafini and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals of Electric Propulsion by : Dan M. Goebel
Download or read book Fundamentals of Electric Propulsion written by Dan M. Goebel and published by John Wiley & Sons. This book was released on 2008-12-22 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Throughout most of the twentieth century, electric propulsion was considered the technology of the future. Now, the future has arrived. This important new book explains the fundamentals of electric propulsion for spacecraft and describes in detail the physics and characteristics of the two major electric thrusters in use today, ion and Hall thrusters. The authors provide an introduction to plasma physics in order to allow readers to understand the models and derivations used in determining electric thruster performance. They then go on to present detailed explanations of: Thruster principles Ion thruster plasma generators and accelerator grids Hollow cathodes Hall thrusters Ion and Hall thruster plumes Flight ion and Hall thrusters Based largely on research and development performed at the Jet Propulsion Laboratory (JPL) and complemented with scores of tables, figures, homework problems, and references, Fundamentals of Electric Propulsion: Ion and Hall Thrusters is an indispensable textbook for advanced undergraduate and graduate students who are preparing to enter the aerospace industry. It also serves as an equally valuable resource for professional engineers already at work in the field.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Basic Research in Electric Propulsion. Part I: Pulsed Plasma Thruster Propellant Efficiency and Contamination. Part II: Arcjet Remote Plume Measurement and Hydrogen Density by :
Download or read book Basic Research in Electric Propulsion. Part I: Pulsed Plasma Thruster Propellant Efficiency and Contamination. Part II: Arcjet Remote Plume Measurement and Hydrogen Density written by and published by . This book was released on 2002 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed Plasma Thrusters (PPT) have been the major technology under investigation for the Small Satellite Electric Propulsion Thruster Research program. Arcjet technology is also under investigation with Electric Propulsion Space Experiment Optical Signature experiments underway and Multiphoton Laser Induced Fluorescence Measurements of Ground State Atomic Hydrogen have been performed in an arcjet plume. At present PPTs are being tested in the laboratory environment with investigations under way to determine exact inefficiency mechanisms that can be corrected. This work has already identified previously unknown physical behavior in the PPT. The Electric Propulsion Space Experiment is a flight demonstration of a 30 kW ammonia arcjet propulsion system. Optical measurements of the arcjet plume were performed using on-board optical equipment ground observatories and other space platforms. Low power arcjet technology provided definitive work on atomic species plume concentrations in low power hydrogen arcjet plumes. This work applied a flame diagnostic Multiphoton Laser Induced Fluorescence to the excited-state plasma environment to investigate concentration levels of atomic ground-state hydrogen.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722016074 Total Pages :38 pages Book Rating :4.0/5 (16 download)
Book Synopsis A Preliminary Investigation of Hall Thruster Technology by : National Aeronautics and Space Administration (NASA)
Download or read book A Preliminary Investigation of Hall Thruster Technology written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-28 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A three-year NASA/BMDO-sponsored experimental program to conduct performance and plume plasma property measurements on two Russian Stationary Plasma Thrusters (SPTs) has been completed. The program utilized experimental facilitates at the University of Michigan's Plasmadynamics and Electric Propulsion Laboratory (PEPL). The main features of the proposed effort were as follows: (1) Characterized Hall thruster (and arcjet) performance by measuring ion exhaust velocity with probes at various thruster conditions; (2) Used a variety of probe diagnostics in the thruster plume to measure plasma properties and flow properties including T(sub e) and n(sub e) ion current density and ion energy distribution, and electric fields by mapping plasma potential; (3) Used emission spectroscopy to identify species within the plume and to measure electron temperatures. A key and unique feature of our research was our collaboration with Russian Hall thruster researcher Dr. Sergey A Khartov, Deputy Dean of International Relations at the Moscow Aviation Institute (MAI). His activities in this program included consulting on and participation in research at PEPL through use of a MAI-built SPT and ion energy probe. Gallimore, Alec D. Glenn Research Center NAG3-1504...
Book Synopsis Numerical Simulations of the Plumes of Electric Propulsion Thrusters by : Douglas Bryan VanGilder
Download or read book Numerical Simulations of the Plumes of Electric Propulsion Thrusters written by Douglas Bryan VanGilder and published by . This book was released on 2000 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technology for Large Space Systems by :
Download or read book Technology for Large Space Systems written by and published by . This book was released on 1990 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1998 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781724030405 Total Pages :34 pages Book Rating :4.0/5 (34 download)
Book Synopsis Summary of Experiments Performed to Investigate the Effects of Ion Thruster Plumes on Microwave Propagation by : National Aeronautics and Space Adm Nasa
Download or read book Summary of Experiments Performed to Investigate the Effects of Ion Thruster Plumes on Microwave Propagation written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-25 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electric propulsion systems have now reached a level of maturity where they are being used on operational spacecraft. One concern for the designers however, is the effect of the ion exhaust plumes produced by the systems, on microwave communication with the spacecraft. To better understand these effects, a number of propagation experiments were performed at the NASA Glenn Research Center with an operating ion thruster. This report describes the experiments and presents the results of the data obtained. Lambert, Kevin M. and Zaman, Afroz J. Glenn Research Center NASA/TM-1999-209276, E-11732, NAS 1.15:209276
Book Synopsis Compatibility of Field Emission Cathode and Electric Propulsion Technologies by : Colleen Marie Marrese
Download or read book Compatibility of Field Emission Cathode and Electric Propulsion Technologies written by Colleen Marie Marrese and published by . This book was released on 1999 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimentally Characterizing the Plume of a Divergent Cusped-Field Thruster by :
Download or read book Experimentally Characterizing the Plume of a Divergent Cusped-Field Thruster written by and published by . This book was released on 2009 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Divergent cusped-field thrusters are electric propulsion devices characterized by a divergent, dielectric wall channel and a magnetic topology dominated by two magnetic cusps and a magnetic bottle near the anode. Initial testing results suggest that this technology may lend itself to miniaturization while providing improved lifetime performance over miniature Hall thruster designs. This paper presents results of detailed probing of the divergent cusped-field thruster plume using a faraday cup and a retarding potential analyzer to measure the ion current density and energy distributions at varied operating conditions. These results provide a more complete experimental characterization of the plume than was previously available by measuring plume attributes at wider angles with increased spatial resolution. Plume data analyses show regions with the greatest current density contain the most energetically uniform ion populations. However, the retarding potential analyzer results indicate that highly energetic ions are expelled at large angles relative to the thruster axis of symmetry, though the current densities at these angles are much lower. Plume measurements made while varying the cathode operating condition are also presented. The operating conditions of the divergent cusped-field thruster and cathode are found to be strongly coupled, motivating a future study that systematically examines the effect of cathode location and operating condition on the performance of the thruster. The mode transitions that occur while operating the divergent cusped-field thruster are also examined, providing a quantitative comparison between the two.
Book Synopsis Micro Newton Thruster Development by : Franz Georg Hey
Download or read book Micro Newton Thruster Development written by Franz Georg Hey and published by Springer. This book was released on 2018-03-01 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: Franz Georg Hey summarises the development and testing of a micro-Newton thrust balance, as well as the downscaling of a High Efficiency Multistage Plasma Thruster to micro-Newton thrust levels. The balance is tailored to fully characterise thruster candidates for the space based gravitational wave detector LISA. Thus, thrust noise measurements in sub-micro-Newton regime can be performed in the overall LISA bandwidth. The downscaled thruster can be operated down to serval tens of micro-Newton with a comparably high specific impulse. About the Author Franz Georg Hey works as mechanical, thermal, propulsion architect and technical lead of the micro‐Newton propulsion laboratory of Europe’s leading air and spacecraft manufacturer. The author is participating on major programmes for future satellite and electric propulsion development. The author’s research is performed in close collaboration with the Dresden University of Technology, the University of Bremen and the DLR Bremen.
Book Synopsis Experimental and Theoretical Investigation of Pulsed Plasma Thrusters by : Hani Kamhawi
Download or read book Experimental and Theoretical Investigation of Pulsed Plasma Thrusters written by Hani Kamhawi and published by . This book was released on 2002 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Secondary Species Emission and Behavior for Electrospray Thrusters by : Nolan Michael Uchizono
Download or read book Secondary Species Emission and Behavior for Electrospray Thrusters written by Nolan Michael Uchizono and published by . This book was released on 2022 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electrospray propulsion devices employ strong electric fields to extract high velocity droplets and molecular ions from a liquid propellant. When these constituents strike downstream surfaces, impact processes can lead to the emission of a diverse set of secondary species, including electrons, atomic ions, molecular ions, and subsidiary droplets. The objective of this research is to examine the emission and transport of secondary species in electrospray thrusters to understand the effects on thruster life, performance, spacecraft interactions, and terrestrial facility effects. This dissertation presents theoretical, analytical, and experimental investigations of electrospray operation in vacuum facilities to show that secondary species emission (SSE) plays a significant role in the behavior of electrospray thrusters during ground testing. First, an analysis of SSE mechanisms and onset thresholds showed that SSE occurs in the regimes where electrospray thrusters commonly operate. Therefore, SSE must be carefully considered for accurate measurements and determination of performance and life. A series of experiments were conducted to investigate the consequence of SSE on electrospray thruster operation. A beam target biasing experiment was conducted to demonstrate the impact of SSE on thruster-to-facility coupling, which introduces significant uncertainty in thruster lifetime measurements. A novel "SSE probe" diagnostic was developed and used to obtain the first-ever angular distributions of positive and negative SSE yields for an electrospray thruster. An optical emission spectroscopy study was conducted to show that glow discharges observed in electrospray thrusters during vacuum operation are a consequence of SSE; this observation is in direct contrast to common postulations that glows are intrinsic to electrospray operation. Two analytical models were developed to study SSE impact on thruster performance and lifetime. The first model was a one-dimensional heat and mass flux analysis of an ionic liquid ion source, which showed that SSE-induced Ohmic dissipation can significantly affect thruster performance. The second model, named the "Electrospray SSE Control-volume Analysis for Resolving Ground Operation of Thrusters" (ESCARGOT) invokes conservation of charge to derive a set of governing equations that describes the emission and transport of secondary species throughout an electrospray thruster and testing facility. The model relies on geometric factors obtained from numerical simulations, and experimentally-obtained SSE yields to correct for SSE-induced current measurement uncertainty in thruster performance and life testing. Therefore, the ESCARGOT model serves as an important link to determine accurate in-space thruster life and performance predictions based on terrestrial qualification testing. Overall, this work reveals the critical importance of SSE to electrospray thruster performance, life, facility effects, and space interactions; and provides both experimental and modeling techniques to assess their impact for a range of operating and test conditions
Book Synopsis Experimental and Numerical Examination of a Hall Thruster Plume (Preprint). by :
Download or read book Experimental and Numerical Examination of a Hall Thruster Plume (Preprint). written by and published by . This book was released on 2007 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The plume of a Busek BHT-200 xenon Hall thruster has been characterized through measurements from various plasma electrostatic probes. Ion current flux, plasma potential, plasma density, and electron temperatures were measured from the near-field plume to 60 cm downstream of the exit plane. These experimentally derived measurements were compared to numerical simulations run with the plasma plume code DRACO. A major goal of this study was to determine the fidelity of the DRACO numerical simulation. The effect of background pressure on the thruster plume was also examined using ion current flux measurements at higher than nominal pressure.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721657155 Total Pages :26 pages Book Rating :4.6/5 (571 download)
Book Synopsis Development of a Computationally Efficient, High Fidelity, Finite Element Based Hall Thruster Model by : National Aeronautics and Space Administration (NASA)
Download or read book Development of a Computationally Efficient, High Fidelity, Finite Element Based Hall Thruster Model written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-21 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the development of a two dimensional finite element based numerical model for efficient characterization of the Hall thruster plasma dynamics in the framework of multi-fluid model. Effect of the ionization and the recombination has been included in the present model. Based on the experimental data, a third order polynomial in electron temperature is used to calculate the ionization rate. The neutral dynamics is included only through the neutral continuity equation in the presence of a uniform neutral flow. The electrons are modeled as magnetized and hot, whereas ions are assumed magnetized and cold. The dynamics of Hall thruster is also investigated in the presence of plasma-wall interaction. The plasma-wall interaction is a function of wall potential, which in turn is determined by the secondary electron emission and sputtering yield. The effect of secondary electron emission and sputter yield has been considered simultaneously, Simulation results are interpreted in the light of experimental observations and available numerical solutions in the literature. Jacobson, David (Technical Monitor) and Roy, Subrata Glenn Research Center
Book Synopsis Experimental and Theoretical Investigation of an Inverse-pinch Coaxial Pulsed Plasma Thruster by : Hani Kamhawi
Download or read book Experimental and Theoretical Investigation of an Inverse-pinch Coaxial Pulsed Plasma Thruster written by Hani Kamhawi and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
