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Modeling And Parametric Performance Analysis Of Field Emission Electric Propulsion
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Book Synopsis Modeling and Parametric Performance Analysis of Field Emission Electric Propulsion by : Dinaol Gadisa
Download or read book Modeling and Parametric Performance Analysis of Field Emission Electric Propulsion written by Dinaol Gadisa and published by GRIN Verlag. This book was released on 2023-03-22 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2023 in the subject Engineering - Aerospace Technology, grade: 3,4, , language: English, abstract: Space electric propulsion is required not only for orbit raising and transfer, position control, and station keeping, but also for spacecraft attitude control, advanced thermal material testing, and end-of-life de-orbiting that is much more fuel efficient than conventional chemical rockets. FEEP thruster is one type of ion propulsion system that provides a low thrust of the order of micro-Newton (μN) to milli-Newton (mN) that is primarily used for precise spacecraft attitude control with extremely high efficiency and small impulse bits based on the exhaust velocity of an ejected ion from a thruster. This thesis report includes a mathematical and 3D CAD model of a FEEP thruster with the overarching goal of investigating and analyzing the thruster’s parametric performance. To accomplish this, a MATLAB program was used to simulate the change in thrust and exhaust velocity over time using various types of liquid metal as a propellant, assuming the fuel mass is equal to the atomic mass of the propellant, the wet mass of the spacecraft is assumed to be 4kg, and the charge of an ion is assumed to be 1.602 × 10−19 while the supplied voltage is held constant at 10 kV. Furthermore, because the porous crown emitter is the heart of the FEEP thruster, its stiffness and topology optimization were investigated. The simulation results show that the thrust value of the FEEP thruster over time ranges from 0.213μN to 211mN during stable ion flow rate and mass expulsion of indium propellant, implying that the result is comparable to realistic FEEP parameters. Furthermore, as expected, increasing the voltage between the emitter and extractor electrodes and decreasing the mass expulsion of the propellant increased the thrust value of the FEEP thruster.
Book Synopsis Development of a Performance Model for a Field Emission Electric Propulsion System by : David Michael Jelem
Download or read book Development of a Performance Model for a Field Emission Electric Propulsion System written by David Michael Jelem and published by . This book was released on 2016 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within this master's thesis the performance of a field emission ion thruster using Indium as propellent is investigated. The core element of this propulsion system is a crown made of porous tungsten needles, infiltrated with liquid indium. If high voltage is applied to this crown, the field strength is sufficiently high to start ionic field emission at the needle tips. This highly energetic ion beam is then directed in one direction to create thrust of up to 400 $\mu N$. An established analytical method for the emission current, which up to now relied on the assumption of a parabolically shaped needle, was extended by taking the actual field geometry of the emitting needle tips into account. To solve the electric potential for a set of boundary condition points obtained from a 3D scan of the needles, a numeric algorithm was developed that computes an approximate solution of the Laplace equation. This way a significantly improved agreement with experimentally measured current - voltage characteristics could be achieved. Combining the impedance model with empirical data for the mass efficiency as a function of the emitted current, the form factor of the ion beam and the electrical efficiency, allowed to model the performance of a FEEP thruster within the entire operational envelope. This model was used to predict the performance envelope of the newly developed IFM nano thruster with different emitters and to identify the engineering challenges that need to be overcome to improve FEEP systems in the future.*****Within this master's thesis the performance of a field emission ion thruster using Indium as propellent is investigated. The core element of this propulsion system is a crown made of porous tungsten needles, infiltrated with liquid indium. If high voltage is applied to this crown, the field strength is sufficiently high to start ionic field emission at the needle tips. This highly energetic ion beam is then directed in one direction to create thrust of up to 400 $\mu N$. An established analytical method for the emission current, which up to now relied on the assumption of a parabolically shaped needle, was extended by taking the actual field geometry of the emitting needle tips into account. To solve the electric potential for a set of boundary condition points obtained from a 3D scan of the needles, a numeric algorithm was developed that computes an approximate solution of the Laplace equation. This way a significantly improved agreement with experimentally measured current - voltage characteristics could be achieved. Combining the impedance model with empirical data for the mass efficiency as a function of the emitted current, the form factor of the ion beam and the electrical efficiency, allowed to model the performance of a FEEP thruster within the entire operational envelope. This model was used to predict the performance envelope of the newly developed IFM nano thruster with different emitters and to identify the engineering challenges that need to be overcome to improve FEEP systems in the future.
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 1992 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research and Technology Program Digest Flash Index by :
Download or read book Research and Technology Program Digest Flash Index written by and published by . This book was released on 1967 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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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 2023-10-25 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Electric Propulsion Understand the fundamental basis of spaceflight with this cutting-edge guide As spacecraft engineering continues to advance, so too do the propulsion methods by which human beings can seek out the stars. Ion thrusters and Hall thrusters have been the subject of considerable innovation in recent years, and spacecraft propulsion has never been more efficient. For professionals within and adjacent to spacecraft engineering, this is critical knowledge that can alter the future of space flight. Fundamentals of Electric Propulsion offers a thorough grounding in electric propulsion for spacecraft, particularly the features and mechanisms underlying Ion and Hall thrusters. Updated in the light of rapidly expanding knowledge, the second edition of this essential guide detailed coverage of thruster principles, plasma physics, and more. It reflects the historic output of the legendary Jet Propulsion Laboratory and promises to continue as a must-own volume for spacecraft engineering professionals. Readers of the second edition of Fundamentals of Electric Propulsion readers will also find: Extensive updates to chapters covering hollow cathodes and Hall thrusters, based on vigorous recent research New sections covering magnetic shielding, cathode plume instabilities, and more Figures and homework problems in each chapter to facilitate learning and retention Fundamentals of Electric Propulsion is an essential work for spacecraft engineers and researchers working in spacecraft propulsion and related fields, as well as graduate students in electric propulsion, aerospace science, and space science courses.
Book Synopsis Government-wide Index to Federal Research & Development Reports by :
Download or read book Government-wide Index to Federal Research & Development Reports written by and published by . This book was released on 1966-12 with total page 1288 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 1999 with total page 1032 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Engineering Design and Mathematical Modelling by : Nnamdi Nwulu
Download or read book Engineering Design and Mathematical Modelling written by Nnamdi Nwulu and published by Taylor & Francis. This book was released on 2020-12-17 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineering Design and Mathematical Modelling: Concepts and Applications consists of chapters that span the Engineering design and mathematical modelling domains. Engineering design and mathematical modelling are key tools/techniques in the Science, Technology and Innovation spheres. Whilst engineering design is concerned with the creation of functional innovative products and processes, mathematical modelling seeks to utilize mathematical principles and concepts to describe and control real world phenomena. Both of these can be useful tools for spurring and hastening progress in developing countries. They are also areas where Africa needs to ‘skill-up’ in order to build a technological base. The chapters in this book cover the relevant research trends in the fields of both engineering design and mathematical modelling. This book was originally published as a special issue of the African Journal of Science, Technology, Innovation and Development.
Book Synopsis 44th Congress of the International Astronautical Federation by :
Download or read book 44th Congress of the International Astronautical Federation written by and published by . This book was released on 1993 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Book Synopsis Space Microsystems and Micro/Nano Satellites by : Zheng You
Download or read book Space Microsystems and Micro/Nano Satellites written by Zheng You and published by Butterworth-Heinemann. This book was released on 2017-11-22 with total page 441 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space Microsystems and Micro/Nano Satellites covers the various reasoning and diverse applications of small satellites in both technical and regulatory aspects, also exploring the technical and operational innovations that are being introduced in the field. The Space Microsystem developed by the author is systematically introduced in this book, providing information on such topics as MEMS micro-magnetometers, MIMUs (Micro-inertia-measurement unit), micro-sun sensors, micro-star sensors, micro-propellers, micro-relays, etc. The book also examines the new technical standards, removal techniques or other methods that might help to address current problems, regulatory issues and procedures to ameliorate problems associated with small satellites, especially mounting levels of orbital debris and noncompliance with radio frequency and national licensing requirements, liabilities and export controls, Summarizing the scientific research experiences of the author and his team, this book holds a high scientific reference value as it gives readers comprehensive and thorough introductions to the micro/nano satellite and space applications of MEMS technology. Covers various reasoning and diverse applications for small satellites in both technical and regulatory aspects Represents the first publication that systematically introduces the Space Microsystem developed by the author Examines new technical standards, removal techniques and other methods that might help to address current problems, regulatory issues and procedures
Book Synopsis Technical Literature Abstracts by : Society of Automotive Engineers
Download or read book Technical Literature Abstracts written by Society of Automotive Engineers and published by . This book was released on 2000 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Research and Technology Program Digest by : United States. National Aeronautics and Space Administration
Download or read book Research and Technology Program Digest written by United States. National Aeronautics and Space Administration and published by . This book was released on with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of the British Interplanetary Society by : British Interplanetary Society
Download or read book Journal of the British Interplanetary Society written by British Interplanetary Society and published by . This book was released on 1995 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bound with vol. 1- , 1934- , is the Society's annual report and list of members, 1934- .
Book Synopsis Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
