Electron-beam diagnostic methods for hypersonic flow diagnostics

final NASA report grant no. 2-718.
  • 0.87 MB
  • English

National Aeronautics and Space Administration, National Technical Information Service, distributor , [Washington, D.C, Springfield, Va
Electron beams, Flow measurement, Hypersonic flow, Fluorescence, Flow distrib
Other titlesElectron beam diagnostic methods for hypersonic flow diagnostics.
Series[NASA contractor report] -- NASA CR-202160.
ContributionsUnited States. National Aeronautics and Space Administration.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL17543215M

To evaluate the capability of an electron-beam fluorescence diagnostics instrument in a hypersonic flow facility we can predict the expected signal level using equation (7) and typical operating characteristics for a 10 mA electron beam operating with electron energies of 10 keV, 20 keV, and 50 keV.

The electron-beam fluorescence technique was developed as an experimental diagnostic for rarefied gas dynamic research over twenty years ago. In addition to extensive laboratory research, flight-research using electron-beam fluorescence has been successful in providing measurements of nitrogen rotational and vibrational temperature, and the density of nitrogen Cited by: 2.

On the Characteristics of an Electric Discharge Generated across a Shock Wave in a Hypersonic Flow JOURNAL OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, Vol. 51, No. Electron beam fluorescence methods in hypersonic aerothermodynamicsCited by: 5.

The purpose of this work was the evaluation of the use of electron-bean fluorescence for flow measurements during hypersonic flight.

Download Electron-beam diagnostic methods for hypersonic flow diagnostics FB2

Both analytical and numerical models were developed in this investigation to evaluate quantitatively flow field imaging concepts based upon the electron beam fluorescence technique for use in flight research and wind tunnel applications.

New laser-based diagnostic techniques, developed primarily within the combustion community, offer considerable promise for measurements in hypersonic flows. In this paper we overview three diagnostic Cited by: 5.

This compilation of research activity identifies the areas in high-speed flows where electron beam fluorescence measurement methods can be successfully applied. EBFT applications for a variety of hypersonic and short-duration flow facilities are also discussed and recent activity relating to the use of electron beams, primarily in hypersonic aerothermodynamics, is Cited by: However, nonequilibrium also frequently occurs as a byproduct of heating and accelerating the test gas in hypersonic facilities.

For example, in order to achieve the required high flow enthalpy and Mach number, gas is often heated to thousands of Kelvin and then expanded through a Size: 4MB.

Electron beam fluorescence methods in hypersonic aerothermodynamics Progress in Aerospace Sciences, Vol. 33, No. Electron Beam Diagnostics Applied to High-Density Gasdynamic Laser MixturesCited by: 7. Introduction and retrospective. The use of optical diagnostics for the study of high-speed flows dates back to the s when shadowgraphs and schlieren yielded images of the bow shocks, Mach disks and other structures associated with high-speed projectiles and supersonic flows [21] (see Fig.

1).Cited by: 3. Description. Hypersonic Flow Theory presents the fundamentals of fluid mechanics, focusing on the hypersonic flow theory and approaches in theoretical aerodynamics. This book discusses the assumptions underlying hypersonic flow theory, unified supersonic-hypersonic similitude, two-dimensional and axisymmetric bodies, and circular Edition: 1.

Get this from a library. Electron-beam diagnostic methods for hypersonic flow diagnostics: final NASA report grant no. [United States. National Aeronautics and Space Administration.;]. Electron beam induced signals I Beam excites residual gas atoms/molecules I Residual gas emits photons I Imaging photons on detector I Expected event rates: 2 10 4 cm 1 s 1 @ 10 5 mbar)Highly sensitive detector required (PMT) Schematic setup obiasT Weilbach HIM New Methods for Diagnostics of High Intensity Electron Beams.

This book discusses the low Reynolds number effects, chemical kinetics effects, inviscid flow calculations, and experimental techniques relating to the problems in acquiring an Book Edition: 1. Combustion test diagnosis has always been one of the most important technologies for the development of aerospace engineering.

The traditional methods of measurement have been unable to meet the requirements of accurate capture of the flow field in the development process of the aeroengine by: 2. This book is a self-contained text for those students and readers interested in learning hypersonic flow and high-temperature gas dynamics.

It assumes no prior familiarity with either subject on the part of the reader. If you have never studied hypersonic and/or high-temperature gas dynamics before, and if you have never worked extensively in the area, then this book is 4/5(1).

Electron-beam tomography of the density of a gas in hypersonic flow around objects Article (PDF Available) in Technical Physics 43(4). Because of the growing interest in hypersonic flows, the AGARD Fluid Dynamics Panel initiated a sub-working group on instrumentation for hypersonics in This sub-group, chaired by J.

Details Electron-beam diagnostic methods for hypersonic flow diagnostics FB2

WENDT (VKI -Belgium), was composed of: A. BOUTIER (ONERA -France), K. BUTEFISCH (DLR -Germany), R. CATTOLICA. Many different optical diagnostic methods, both laser-based and emission-related, have been developed with applications in a variety of wind and shock tunnel facilities.

This Special Issue aims to present new experimental research and novel applications of optical diagnostic methods. properties obtained for the VKF Hypersonic Wind Tunnel (C) might be incorrect. As a result of the continued experimentation and improved confidence in electron beam diagnostics, it was decided to measure the static temperature in VKF Tunnel.

Description Electron-beam diagnostic methods for hypersonic flow diagnostics EPUB

Diagnostic methods capable of investigating the beam properties and of assessing the relevance of the various phenomena will be discussed. Examples will be given regarding the measurements collected in the small flexible NIO1 source and regarding the expected results of the prototype of the neutral beam injectors for by: Such methods provide new tools for measuring physical properties such as temperature, pressure, velocity, and density, as well as, time and spatially resolved chemical species composition.

The end goal is the detailed understanding of flow physics coupled with complex reaction chemistry in numerous mechanical & aerospace engineering applications.

Hypersonic and High Temperature Gas Dynamics by John D. Anderson to the AIAA Education Series. I have known John Anderson for more years than either he or I are comfortable recalling, and I have always found him to be extre-mely articulate and insightful.

The original edition published by McGraw-Hill in. Widely used qualitative and semiquantitative optical flow diagnostics are shadowgraph, schlieren, and interferometry. Laser-based techniques such as laser Doppler anemometry and particle image velocimetry are well established for investigation of supersonic flows, but as yet their use in hypersonic flows has been limited.

Rapid pulse electron beam fluorescence for flow field diagnostics p. Electron beam fluorescence imaging for hypersonic research p. Pressure - Forces Force measurement in hypervelocity impulse facilities p. A six component balance for short duration hypersonic File Size: 6KB. Hypersonic flow diagnostics.

Filtered Rayleigh scattering (FRS) is a useful and proven tool for flow diagnostics, and a key aspect of this technique is that no seeding of the flow is needed. Laser Rayleigh scattering is obtained by elastic scattering of molecules and nanoscale particles.

Measurements are made with a high power, short pulse. Shock Wave-Boundary Layer Interaction (SBLI) is a phenomenon occurring in high-speed propulsion systems that is highly undesirable. Numerous methods have been tested to manipulate and control SBLI which includes both active and passive flow control techniques.

To determine the improvements brought by the flow control techniques, advanced and state-of the-art flow Author: Mohd Rashdan Saad, Azam Che Idris, Konstantinos Kontis. In other words, this book is designed for two roles: 1) as an effective classroom text that can be used with ease by the instructor, and understood with ease by the student; and 2) as a viable, professional working tool for engineers, scientists, and managers who have any contact in their jobs with hypersonic and/or high-temperature by: For transonic and compressible flow, the Mach and Reynolds numbers alone allow good categorization of many flow cases.

Hypersonic flows, however, require other similarity parameters. First, the analytic equations for the oblique shock angle become nearly independent of Mach number at high (~>10) Mach numbers.

Beam diagnostics is an essential constituen t of any accelerator. These systems are our organs of sense that let us perceive what properties a beam has and how it behaves in an accelerator.

Without diagnostics, we would blindly grope around in the dark and the achievement of a beam for physics-use would be a matter of sheer luck.

As the saying Cited by: New Trends in Instrumentation for Hypersonic Research. [A Boutier] -- This book collects most of the expertise available throughout the world on the instrumentation for the characterization of hypersonic flows. Rapid pulse electron beam fluorescence for flow field diagnostics -- Electron beam fluorescence imaging for hypersonic research.

We are seeking a Postdoctoral Appointee to support the development and use of advanced fluids diagnostics for experiments primarily in Sandia’s Hypersonic Wind Tunnel (Mach 5, 8, and 14), with some work involving the Trisonic Wind Tunnel as well (Mach – ).For hypersonic flow, it was found that the most effective plasma actuator is derived from an electromagnetic perturbation.

An experimental study was performed between hypersonic flow and plasma aerodynamic actuation interaction in a hypersonic shock tunnel, in which a Mach number of 7 was reached.This Mach angle is described by the equation where a is the speed of the sound wave and v is the flow velocity.

Since M=v/a, the equation becomes. Smaller Mach numbers position the shock wave closer to the body surface, thus at hypersonic speeds, the shock wave lies extremely close to the body surface.