Download or read book Low Power Hydrazine Arcjet Thruster Study written by H. L. Kurtz and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Benefits of Low Power Electrothermal Propulsion written by and published by . This book was released on 1997 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arcjet Thruster Research and Technology Phase 1 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-25 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal objective of this two phase program is to conduct the development research required to make the low power arcjet a flight ready technology. Many important results were obtained during Phase 1 to move closer to this objective. Fundamental analyses were performed of the arcjet nozzle, the gas kinetic reaction effects, the thermal environment, and the arc stabilizing vortex. These aided the conceptual understanding of the arcjet and guided design work. A hydrazine (N2H4) arcjet was designed that combined a flight qualified catalyst bed with a modular arcjet. Extensive testing was performed which demonstrated the feasibility of using this propellant in an arcjet for the first time. Startup techniques were developed, stability maintained, material compatibility tests conducted, and performance mapping tests performed. Specific impulse values from 400 to 730 seconds were produced with a non-optimized design. These levels are higher than were originally thought possible and proved that extremely high enthalpy values can be obtained with constricted arc technology. Erosion rate data are promising for lifetime extensions to meet flight application requirements. Power control unit (PCU) development was started with the design and fabrication of a laboratory high switching frequency supply. Valuable data were obtained on PCU operation and on the interaction with the dynamic arc. Phase 2 efforts presently underway are resolving key issues for multi-hundred hour lifetimes, are continuing to investigate arcjet/PCU interactions, and will demonstrate duty cycle N2H4 arcjet/PCU operation in a simulated flight mode for lifetimes consistent with initial applications. Unspecified Center NASA-CR-182106, NAS 1.26:182106 NAS3-24631
Download or read book An Extended Life and Performance Test of a Low Power Arcjet written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: An automated, cyclic life test was performed to demonstrate the reliability and endurance of a low power dc cycle arcjet thruster. Over 1000 hr and 500 on-off cycles were accumulated which would represent the requirements for about 15 years of on-orbit lifetime. A hydrogen/nitrogen propellant mixture was used to simulate decomposed hydrazine propellant and the power level was nominally 1.2 kW after the burn-in period. The arcjet operated in a very repeatable fashion from cycle to cycle. The steady state voltage increased by approximately 6 V over the first 300 hr, and then by only 3 V through the remainder of the test. Thrust measurements taken before, during, and after the test verified that the thruster performed in a consistent fashion throughout the tests at a specific impulse of 450 to 460 sec. Post-test component evaluation revealed limited erosion on both the anode and cathode. Other thruster components, including graphite seals, appeared undamaged. Curran, Francis M. and Haag, Thomas W. Glenn Research Center RTOP 506-42-32...
Download or read book Arcjet Thruster Research and Technology Phase 1 written by and published by . This book was released on 1987 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Thermal Analysis and Thrust Performance of a Low Power Arcjet Thruster written by T. Yamada and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Power Ion Propulsion for Small Spacecraft written by Michael J. Patterson and published by . This book was released on 1997 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of 1 KW Hydrazine Arcjet Thrusters written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This final technical report summarizes the research carried out by our group concerned with the fundamentals of hydrazine 1 kW arcjet thrusters. Section 1 presents modeling analysis that predict the nonequilibrium plasmadynamic processes by solving the two-dimensional, axisymmetric, chemical nonequilibrium viscous flows including heat transfer to the anode con-divergent nozzle. Section II presents the coupling of cathode sheath potential models necessary to account for the total voltage operating at 10 A. Excellent agreement is predicted to match data for a 1 kW hadrazine arcjet. Section III presents experimental studies of the internal anode sheath layer by utilizing an array of 14 electrostatic micro-probes. Axial and azimuthal distributions of such plasma properties as the floating potential, anode sheath potential, wall current density, electron number density and electron temperature are reported for power/mass flow ratios ranging between 18 to 30 Mj/kg. Excellent agreement between the data and the numerical models (Sec I and II) is found.
Download or read book Performance of a Miniaturized Arcjet written by John M. Sankovic and published by . This book was released on 1995 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Arcjet Thruster Research and Technology written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design, analysis, and performance testing of an advanced lower power arcjet is described. A high impedance, vortex stabilized 1-kw class arcjet has been studied. A baseline research thruster has been built and endurance and performance tested. This advanced arcjet has demonstrated long lifetime characteristics, but lower than expected performance. Analysis of the specific design has identified modifications which should improve performance and maintain the long life time shown by the arcjet. Makel, Darby B. and Cann, Gordon L. Unspecified Center NASA-CR-180865, NAS 1.26:180865, RPT/BB0642 NAS3-24842...
Download or read book Arcjet Thruster Research and Technology Phase 2 written by and published by . This book was released on 1991 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Performance Characterization of a Low Power Hydrazine Arcjet written by S. C. Knowles and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamental Studies of the Electrode Regions in Arcjet Thrusters written by Mark A. Cappelli and published by . This book was released on 1998 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research focuses on the understanding of the plasma dynamics in the near node and near-cathode region of arcjets with an emphasis on the development of an extensive database for the validation of arcjet models. During the first year of this research period, the arc cathode interaction was investigated by in-situ spectroscopic imaging and by axial emission spectroscopy, providing measurements of cathode current density, cathode temperature, and near-cathode plasma properties. In addition, during this grant period, we have extended the use of Laser Induced Fluorescence (LIF) to make measurements of plasma properties within the expanding region of the nozzle and have accumulated an extended data base that includes, in addition to the use of pure hydrogen propellant, mixtures of hydrogen and nitrogen to simulate hydrazine decomposition products. In the final year, a new laser based diastic, Doppler-Free Absorption Spectroscopy (DFAS) was developed and applied to measure the exit plane electron number density in a hydrogen arcjet, one of the last properties needed to provide closure to the vast data set that we have generated for low power hydrogen arcjet. As a spin-off to this grant, the LIF diagnostics that was developed for arcjet through this program was extended to the study xenon plasmas, and implemented to measure both neutral and ionized on velocities at the exit of a Hall thruster. This contributed to a comprehensive study of the near exit region of our Hall discharge device. To compliment the LIF diagnostics on our Hall thrusters, we have made extensive measurements of the transient and time average plasma properties using conventional electrostatic probes.
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.
Download or read book Physics of Electric Propulsion written by Robert G. Jahn and published by Courier Corporation. This book was released on 2006-05-26 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: Literaturangaben. - Originally published: New York, NY : McGraw-Hill, 1968
Download or read book New Developments and Research Findings NASA Hydrazine Arcjets written by Francis M. Curran and published by . This book was released on 1994 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Low Power Hall Thruster Propulsion written by David Manzella and published by . This book was released on 1996 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
