Precursor Wave Speed Measurements in Electron-driven Linear Shock Tube PDF Download
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Author: Peter Shek Liou
Publisher:
ISBN:
Category : Shock tubes
Languages : en
Pages : 68
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Book Description
Author: Peter Shek Liou
Publisher:
ISBN:
Category : Shock tubes
Languages : en
Pages : 68
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Book Description
Author: Moshe Joel Lubin
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 200
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Author: Anthony John Mulac
Publisher:
ISBN:
Category : Shock waves
Languages : en
Pages : 148
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 602
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Book Description
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.
Author: Ario Romiti
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
The requirement of high sensitivity gages for precursor measurements in weakly ionized gas ahead of shock waves in diaphragm-operated shock tubes has been met by establishing an electrostatic probe theory fit for the experimental conditions. Explicity expressions for ion number density, concentration and precursor source function have been found. (Author).
Author:
Publisher: Academic Press
ISBN: 0080576990
Category : Computers
Languages : en
Pages : 429
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Advances in Electronics and Electron Physics
Author: H. G. Ahlstrom
Publisher:
ISBN:
Category : Electromagnetic fields
Languages : en
Pages : 34
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This report was concerned with the nature, cause and magnitude of some of the precursor effects and the separation of the shock from the hot gas associated with the discharge in the 6-inch electromagnetically driven shock tube. The fact that the shock tube is 4 m long allows one to study the propagation of the shock wave after the discharge has terminated. The large diameter makes the tube wall effects less important. It was found that the main precursor effect was caused by vacuum ultraviolet radiation. Impurities in the gas were probably ionized. It should be noted that near the discharge, a very large percentage of these impurities will be ionized. If the impurity level is not very low, it is quite possible to increase the enthalpy of the gas ahead of the shock significantly through ionization of the impurities. For instance, if the average energy absorbed per impurity molecule were 20 ev and the impurity concentration were 0.1 mole percent, the absorption of this much energy would correspond to an increase in temperature of about 150 K. Any calculations based on the Rankine-Hugoniot relations would have to take this fact into account.
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 966
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Author: Lawrence Bruce Holmes
Publisher:
ISBN:
Category :
Languages : en
Pages : 362
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A review of the literature on electrical precursors associated with strong shock waves is presented. Negative well-type electrostatic precursor signals are obtained from the potential probe experiments. Potential probe experiments in conjunction with a solenoidal magnetic field show that the electrostatic precursor signal is due in part to radial diffusion of electrons to the wall of the shock tube. A theory is presented for the diffusion of the electrons and ions to the grid of the probe and for the motion of the charged particles inside the probe. This theory relates the collected currents to the plasma density in the shock tube. The evidence of the existence of a neutral plasma and the high velocity of propagation of the precursor strongly suggests that the gas ahead of the shock wave is photoionized. It was established that multiple step photoionization produces the plasma.
Author: James Alan Reed
Publisher:
ISBN:
Category :
Languages : en
Pages : 114
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Book Description
