Author: K. T. YenPublisher:
ISBN:
Category : Ionized gases
Languages : en
Pages : 19
Book Description
Effect of Microwave Radiation on the Ionized Gas Behind a Strong Normal Shock Wave
Author: K. T. YenPublisher:
ISBN:
Category : Ionized gases
Languages : en
Pages : 19
Book Description
Effect of Microwave Radiation on the Ionized Gas Ba Strong Normal Shock Wave
Author: K. T. YenPublisher:
ISBN:
Category :
Languages : en
Pages : 19
Book Description
An analytical study of the interaction between microwaves and a fully-ionized gas behind a normal shock wave is presented. The governing differential equations derived by a quasi-steady analysis are used to obtain the non-dimensional parameters and integrated to yield the first integrals of the momentum and energy equations. A modified Prandtl relation is derived from which the final equilibrium state of the ionized gas can be found. Ionization is seen to increase the final equilibrium density, while microwave heating tends to reduce its value. It is further shown that thermal choking of the ionized gas occurs at a critical microwave power level, which is a function of the Mach number ahead of the shock wave, the reflection coef ficient of the microwave, and the ionization potential expressed in terms of the neutral gas temperature ahead of the shock wave. At higher power levels the shock wave moves upstream allowing additional microwave heating of the ionized gas. A formula is given for the determi nation of this equivalent higher Mach number. At a sufficiently high power level (but slightly below the critical value), the mean gas tempera ture is shown to attain a peak value higher than its final equilibrium value. This peak temperature actually represents the upper bound of the mean gas temperature for a given initial Mach number. (Author).
U.S. Government Research Reports
Author: Ionized Shock Front Analysis. Part Iii. Effect of Joule Heating on Electron Density Level and Microwave Properties Downstream of a Strong Shock Wave
Author: MELVIN. EPSTEINPublisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
An investigation was carried out of the interaction between a slightly ionized gas downstream of a shock wave and a microwave of sufficient strength to at least slightly alter the electron density level in the gas. The particular type of interaction is that resulting from the Joule heating of the gas. It is assumed that the gas is always in complete equilibrium and so the results may be considered to be valid only in the limiting case of collision frequency large compared to the signal frequency. The calculations indicate that this type of interaction may produce significant increases in electron density level for field strengths as low as one volt/cm under the appropriate conditions. (Author).
Scientific and Technical Aerospace Reports
Author: Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 970
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.
Nuclear Science Abstracts
Author: Applied Mechanics Reviews
Author: Shock Wave Phenomena, with Special Reference to Interactions
Author: Marilyne KatzPublisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 96
Book Description
Reports Received by Division of Technical Information Extension
Author: U.S. Atomic Energy Commission. Division of Technical InformationPublisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 988
Book Description
Effect of Microwave Radiation on a Shock-Produced Electron Precursor
Author: Samuel LedermanPublisher:
ISBN:
Category :
Languages : en
Pages : 25
Book Description
The paper presents some results of experiments in which a small pressure driven shock tube was used to produce shocks in Argon above Mach 10. This was strong enough to produce low level precursor ionization ahead of the shock. At the same time, the shock tube was used as a waveguide for pulsed X-Band microwave radiation with a peak power of a few kilowatts. This further ionized the gas in the precursor region, resulting in an ionization wave which propagated very rapidly toward the microwave source. The velocity of this wave was measured as a function of the microwave power and an interpretation and comparison with other data is given. (Author).