Download or read book Micro Electric Propulsion Feasibility written by and published by . This book was released on 1992 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Micropropulsion for Small Spacecraft written by Michael Matthew Micci and published by AIAA. This book was released on 2000 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Feasibility Study of Laser fabricated Micro needles as an Electrospray Thruster written by Andrew Joseph Broadbent and published by . This book was released on 2018 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Capable of carrying small-scale instruments, micro-satellites, often called CubeSats for their shape, provide an excellent platform for a variety of educational and research missions. However, once placed in orbit satellites experience small amounts of drag that slow the craft down, and deteriorate its orbit over time. The addition of a propulsion system will allow a CubeSat to correct and maintain orbit, as well as perform other maneuvers. Due to their size and power requirements, CubeSats cannot accommodate conventional propulsion methods. Instead, these satellites rely on electric propulsion to provide a compact, low power thruster for making orbital adjustments. Of particular interest to this research are electrospray thrusters. Because of their size, electrospray thrusters can easily be clustered together to form large arrays to make up for the small amounts of thrust, making them ideal for CubeSats. Microfabrication techniques developed at UTSI allow preparation of arrays of emitters suitable for electrospray applications, and exhibiting critical dimensions that can potentially enable smaller, denser arrays requiring less space and power. In this work, these needles were modeled and simulated under an applied voltage to determine if they can be used as electric field enhancers in a thruster. Using procedures established from references, the optimal emitter spacing was also determined.
Download or read book Commercial Aircraft Propulsion and Energy Systems Research written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-08-09 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary human activities that release carbon dioxide (CO2) into the atmosphere are the combustion of fossil fuels (coal, natural gas, and oil) to generate electricity, the provision of energy for transportation, and as a consequence of some industrial processes. Although aviation CO2 emissions only make up approximately 2.0 to 2.5 percent of total global annual CO2 emissions, research to reduce CO2 emissions is urgent because (1) such reductions may be legislated even as commercial air travel grows, (2) because it takes new technology a long time to propagate into and through the aviation fleet, and (3) because of the ongoing impact of global CO2 emissions. Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraftâ€" single-aisle and twin-aisle aircraft that carry 100 or more passengersâ€"because such aircraft account for more than 90 percent of global emissions from commercial aircraft. Moreover, while smaller aircraft also emit CO2, they make only a minor contribution to global emissions, and many technologies that reduce CO2 emissions for large aircraft also apply to smaller aircraft. As commercial aviation continues to grow in terms of revenue-passenger miles and cargo ton miles, CO2 emissions are expected to increase. To reduce the contribution of aviation to climate change, it is essential to improve the effectiveness of ongoing efforts to reduce emissions and initiate research into new approaches.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book The Design and Feasibility of a 10 MN Chemical Space Propulsion Thruster written by Alexander Robert Bruccoleri and published by . This book was released on 2009 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis discusses the design of a ten milli Newton chemical propulsion system for providing approximately 200 m/s delta velocity to a five kg satellite. The nozzle is the focus of the experimental work, which involves building and testing ten 20x upscale 2D nozzles. The ten nozzles involve three classes, an ideal contour for 2D expansion, a 15 degree cone, and the ideal contour widened for the displacement thickness, each cut to 25%, 50% and 100% axial lengths. The last nozzle is a 100% axial length, ideal contour class, that is twice the thickness to see the effect of end wall boundary layer growth. The nozzles are tested in the MIT Space Propulsions Lab's vacuum chamber at sub atmospheric chamber pressures to match the throat Reynolds number with the micro nozzles. For the purposes of this specific design the Reynolds number is on the order of a 1,000; however, tests are done over a range of 200-1,400 to provide additional data to the community. The nozzle's coefficient of thrust efficiency is approximately 80% for Reynolds numbers greater than a 1,000 and the data suggest the efficiency drops below 50% at 200. The error becomes significant at low Reynolds number due to pressure measurement error, which reduces the quality of the results. The entire system is compared to the state-of-the-art in milli Newton class space propulsion systems and recommendations are given for propellant choice, valve and pump designs, and thermal management. For small delta velocity missions ( 200 m/s), a monopropellant chemical propulsion system is advantageous to current electric propulsion and cold gas thrusters due to the low system mass.
Download or read book Micro Cluster Propulsion for Nanosatellite Control Phase 1 written by Julius Perel and published by . This book was released on 1999 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the research, performed at Phrasor Scientific Inc. and the Mechanical Engineering Department at Stanford University, described in this STTR Phase I final report was to demonstrate the feasibility of using charged microclusters as a suitable candidate for micro-electric propulsion showing compatibility for adaptation to microelectro-mechanical systems (MEMS) fabrication. The research was carried out to explore the electrohydrodynamic (EHD) emission properties of microclusters from single micro-capillaries using diagnostic techniques developed for measuring microthruster performance in terms of specific impulse and thrust. The program demonstrated: that charged microclusters emission can occur from positive and negative voltages. A time-of-flight (TOF) data acquisition system was used to determine single micro-capillary emitter thruster performance. Specific impulses approx. 300s were achieved with a corresponding thrust level of approx. 1.25 micro-N. Research performed at Phrasor under another program reached Specific impulses of 500s. This thruster performance approaches levels which are acceptable for meeting AFOSR micro and nanospacecraft mission objectives once techniques are introduced for microfabricating arrays consisting of multiple micron-sized emitters. Propellant system emission studies also determined that higher levels of dopant along with lower flowrates will aid in the increase of charge-to-mass ratios in order to attain higher specific impulses.
Download or read book Enhancing Space Transportation the NASA Program to Develop Electric Propulsion written by and published by . This book was released on 1990 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Electric Propulsion Development written by Ernst Stuhlinger and published by Elsevier. This book was released on 1963-01-01 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in Astronautics and Aeronautics, Volume 9: Electric Propulsion Development covers the proceedings of the Second Electric Propulsion Conference of the American Rocker Society, held in Berkeley, California on March 14-16, 1962. The conference focuses on the existing problems in electric propulsion and their possible solutions. This book is organized into four sections encompassing 35 chapters. The first section deals with the thermodynamics of arcs; the problems of heat and momentum transfer; the chemical processes within arcs; the arc system materials; and the arc jet design problems. The second section considers the problems of ion systems, the various ion sources, and the neutralization of ion beams. This section also looks into the basic ionization processes, the production and charging of heavy particles, the corrosive properties of cesium, and the ion-optical designs. The third section describes various plasma systems, including helical transmission lines, pulsed pinch accelerators, coaxial systems, and j x B accelerators. The theoretical analyses of these systems are briefly examined. The fourth section includes papers on flight testing of electric propulsion models, on vertical rocket probes, and on satellites, This section also discusses some advanced concepts in electric propulsion, such as air scooping during ascent through the atmosphere, systems design and optimization, and planetary and interplanetary missions. This book is of great value to physicists, space engineers and designers, as well as researchers in the fields of astronautics and aeronautics.
Download or read book Parametric Study of an Electric Propulsion Nuclear Thermal Reactor Space Vehicle System written by James Warren Maddox and published by . This book was released on 2019 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: The feasibility of an electric propulsion, nuclear thermal rocket, in-space propulsion system was evaluated by considering both the full range of theoretical possibilities and the likely performance derived from empirical arcjet performance. Joule heating was assumed for the electric propulsion device. The figures of merit were specific impulse and vehicle total initial mass, which quantify engine and mission performance, respectively, with a goal of achieving 1,200 sec specific impulse. Results were compared with state of the art nuclear thermal and chemical propulsion systems to estimate relative performance using a reference mission - a Hohmann transfer from low Earth orbit to low Mars orbit. The results indicate that while performance gains are realized relative to a nuclear thermal rocket, those gains are small - a specific impulse increase of approximately 5% - while the mass penalty is high - an increase of approximately 25%. The 1,200 sec specific impulse goal was not realized. Further, the addition of electricity generating equipment and additional heat loads pose additional mission risks. For all of these reasons, further analysis of the proposed hybrid system is not recommended.
Download or read book Department of Transportation Appropriations for Fiscal Year 1968 Hearings Before the Subcommittee of 90 1 on H R 11456 written by United States. Congress. Senate. Appropriations Committee and published by . This book was released on 1967 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1991 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Electric Propulsion written by Dan M. Goebel and published by John Wiley & Sons. This book was released on 2023-11-30 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.
Download or read book Small Satellites for Earth Observation written by Hans-Peter Röser and published by Walter de Gruyter. This book was released on 2011-12-22 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: The biennial IAA Symposium on Small Satellites for Earth Observation provides a forum for scientists, engineers and managers to exchange information about planned and on-going programs and missions, and present new ideas, covering small satellite mission objectives as well as technology and management aspects for dedicated earth observation satellites. This volume presents selected contributions of the 5th IAA Symposium on Small Satellites for Earth Observation, April 4 - 8, 2005, organized by the International Academy of Astronautics (IAA), Paris, France, and hosted by the German Aerospace Center (DLR), Berlin, Germany.
Download or read book Meeting written by Panel on Science and Technology and published by . This book was released on 1962 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1995 with total page 1994 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Mechanics and Fluid Power Vol 2 written by Suvanjan Bhattacharyya and published by Springer Nature. This book was released on 2023-05-20 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the select proceedings of the 48th National Conference on Fluid Mechanics and Fluid Power (FMFP 2021) held at BITS Pilani in December 2021. It covers the topics such as fluid mechanics, measurement techniques in fluid flows, computational fluid dynamics, instability, transition and turbulence, fluid‐structure interaction, multiphase flows, micro- and nanoscale transport, bio-fluid mechanics, aerodynamics, turbomachinery, propulsion and power. The book will be useful for researchers and professionals interested in the broad field of mechanics.
