Download or read book MHD Flow Control and Power Generation in Low Temperature Supersonic Flows written by and published by . This book was released on 2006 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report developed under STTR contract for topic AFO5-T016. Results of cold MHD flow deceleration and MHD power-generation experiments conducted at The Ohio State University are presented. MHD effect on the flow is detected from flow static-pressure measurements. The observed static-pressure change is due to the MHD interaction and not Joule heating of the flow in the crossed discharge. Comparison of experimental results with modeling calculations shows that the retarding Lorentz force increases the static-pressure rise produced by Joule heating of the flow, while the accelerating Lorentz force reduces the pressure rise. The experiments show that at the present conditions, the electric current in the MHD power-generation regime is very low, on the order of 1 mA. This is entirely due to the bottleneck effect of the discharge cathode layer at conditions where the MHD open voltage is significantly lower than the cathode-voltage fall. Modeling calculations demonstrate that (1) at the flow conductivities currently achieved in low-temperature MHD flows (sigma approx. 0.1 mho/m), low open voltages reduce the MHD currents by more than two orders of magnitude, and (2) this effect cannot be circumvented by seeding the flow at feasible levels (approx. 0.1% or using electrodes with a high secondary-emission coefficient.
Download or read book Low temperature Supersonic Flow Control Using Repetitively Pulsed MHD Force written by Munetake Nishihara and published by . This book was released on 2006 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The dissertation presents results of the low-temperature supersonic flow experiments using magneto-hydrodynamic (MHD) interaction. The M=3 flow in test section was ionized by a high voltage, short pulse duration, high repetition rate pulsed discharge. Transverse electric current was sustained by transverse DC discharge with the electric field applied in the direction perpendicular to the magnetic field direction. Flow temperature with and without 1.4 kW DC discharge inferred from the N2 emission spectra was T=180"20 K, indicating that 90% of the input power is stored in the nitrogen vibrational energy mode. Results of flow visualization using Mie scattering, combined with the results of boundary layer density fluctuation spectra measurements using the Laser Differential Interferometry (LDI) diagnostics, suggest that boundary layer turbulent transition occurs at stagnation pressures of P0~200-250 torr. LDI measurements detected an MHD effect on the ionized boundary layer density fluctuations. Retarding Lorentz force produced an increase of the density fluctuation intensity by up to 2 dB, compared to the accelerating force of the same magnitude applied to the same flow. Static pressure measurements in the MHD section showed that a retarding Lorentz force applied to the flow produced a static pressure increase of up to 17-20%, while accelerating force of the same magnitude applied to the same flow resulted in a static pressure increase of up to 5-7%. The fraction of the discharge input power going into Joule heat in nitrogen and dry air, [alpha]=0.1, has been inferred from the present experiments. Results of kinetic modeling of the crossed pulser-sustainer discharge in magnetic field are also presented. The model predictions are compared with the experimental discharge current-voltage characteristics and time-dependent current traces, both in the absence and presence of magnetic field, showing satisfactory agreement. In the presence of magnetic field, the model predicts electron and ion drift due to Lorentz force in the ExB direction. This effect creates a mechanism for the neutral species flow acceleration or deceleration by collisional momentum transfer from the ions to the neutrals. The results of the present work demonstrate feasibility of low-temperature MHD flow control in well-characterized laboratory experiments, for the first time.
Download or read book Supersonic Flow Control by Magnetic Field written by and published by . This book was released on 2005 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report results from a contract tasking Ioffe Physico-Technical Institute of Russian Academy of Sciences as follows: The project proposes thorough experimental and theoretical investigations of the effects of magnetic and electric fields on performance of magnetohydrodynamic (MHD) control over supersonic flows in supersonic intakes. Experimental and numerical investigations focuses on the basic aspects of MHD interaction taking into account the specific characters of gas ionisation, thermodynamic and electrophysical properties of weakly-ionised plasma, molecular and turbulent transport, shock-waves dynamics, boundary layers on the intake walls, massive flow separation within the scram-jet flow pass. Recent results of experimental and theoretical investigations carried out by the laboratories involved revealed important aspects of MHD supersonic flow control. It was found that a global change of intake flow structure might be achieved with local (in time and space) MHD impact. Other aspect is supposed to be important is investigation of essentially unsteady processes induced by pulse-periodic MHD impact on flow structure in intake models. The MHD flows under study were found to be conducive to separation due to the MHD interaction which is supposed to be investigated as well. Thus in the course of the project new aspects of MHD interaction will be systematically studied: shock-wave-boundary layer interaction, flow separation, local MHD impact and pulse-periodic regime of intake operation.
Download or read book 36th AIAA Plasmadynamics and Lasers Conference 05 5037 05 5390 written by and published by . This book was released on 2005 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Shock Control and Power Extraction by MHD Processes in Hypersonic Air Flow written by and published by . This book was released on 2006 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: This project was a theoretical and experimental research effort on the use of MHD body forces and plasmas for boundary layer control and power extraction in supersonic flow, and on the development of new diagnostics for plasmas and for high-speed flows. The first part of this final report addresses MHD processes for control and power extraction. This section includes the constricted DC driven "snowplow arc" discharge that can potentially be used to accelerate the boundary layer for suppression of separation, volumetric MHD for power extraction, and volumetric MHD for flow control. In order to accomplish volumetric MHD in cold air, a high repetition rate, short pulse sustainer concept is developed and applied for the first demonstration of power extraction from cold supersonic air. The following section addresses non MHD plasma methods of flow control and power extraction, particularly through the use of a dielectric barrier discharge and through a new pulse sustained thermionic power generator embedded into the hot walls of the vehicle engine. Finally, two new diagnostic methods are introduced in the third section: magnetically modulated microwave attenuation for the measurement of electron number density and electron collision frequency, and Radar REMPI for the localized measurement of flow velocity.
Download or read book 43rd AIAA Aerospace Sciences Meeting Exhibit written by and published by . This book was released on 2005 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Simulations of Supersonic Magnetohydrodynamic Flow Control Power and Propulsion Systems written by Tian Wan and published by . This book was released on 2007 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1974 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Government Research Reports written by and published by . This book was released on 1964 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1980 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Engineering Aspects of Magnetohydrodynamics written by and published by . This book was released on 1997 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plasma Science and Technology written by Alexander Fridman and published by John Wiley & Sons. This book was released on 2023-12-22 with total page 805 pages. Available in PDF, EPUB and Kindle. Book excerpt: Plasma Science and Technology An accessible introduction to the fundamentals of plasma science and its applications In Plasma Science and Technology: Lectures in Physics, Chemistry, Biology, and Engineering, distinguished researcher Dr. Alexander Fridman delivers a comprehensive introduction to plasma technology, including fulsome descriptions of the fundamentals of plasmas and discharges. The author discusses a wide variety of practical applications of the technology to medicine, energy, catalysis, coatings, and more, emphasizing engineering and science fundamentals. Offering readers illuminating problems and concept questions to support understanding and self-study, the book also details organic and inorganic applications of plasma technologies, demonstrating its use in nature, in the lab, and in both novel and well-known applications. Readers will also find: A thorough introduction to the kinetics of excited atoms and molecules Comprehensive explorations of non-equilibrium atmospheric pressure cold discharges Practical discussions of plasma processing in microelectronics and other micro-technologies Expert treatments of plasma in environmental control technologies, including the cleaning of air, exhaust gases, water, and soil Perfect for students of chemical engineering, physics, and chemistry, Plasma Science and Technology will also benefit professionals working in these fields who seek a contemporary refresher in the fundamentals of plasma science and its applications.
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1976 with total page 1314 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 1971 with total page 1388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
