Published 6 issues per year
ISSN Print: 1948-2590
ISSN Online: 1948-2604
PHOTOIONIZATION OF AIR AHEAD OF A SHOCK WAVE ABOUT AN AIRCRAFT FOR FLIGHT VELOCITIES OF 6−8 km/s
ABSTRACT
The approximate model for the definition of the photoionization aureole parameters ahead of the bow shock wave about an aircraft is presented for the flight velocity range from 6 to 8 km/s. The photoionization aureole is formed by nonequilibrium ultraviolet radiation of a shock layer. The model uses the experimental results obtained at the arc-driven shock wind tunnel of the Central Aerohydrodynamic Institute (TsAGI) and allows defining the electron distribution and concentration, electron temperature, and frequencies of electron collisions in the photoionization zone; i.e., the parameters that define the degree of photoionization aureole influence on the propagation, reflection, and attenuation of radio waves. As an example, the results of the determination of the electron concentration and electron temperature distributions ahead of the shock wave for a flight altitude of 60 km and a velocity of 6.5 km/s are presented.