Correction in Flow Variables of Uniform Medium Perturbed by Strong Shock Waves

Abstract

Shock wave, strong pressure wave in any elastic medium such as air, water, or a solid substance, produced by supersonic aircraft, explosions, lightning, or other phenomena that crate violent changes in pressure. Shock waves differ from sound waves in that the wave front, in which compression takes place, is a region of sudden and violent change in stress, density, and temperature. Because of this. Shock waves propagate in a manner different front that of ordinary acoustic waves. In particular, shock waves travel faster than sound, and their speed increases as the amplitude is raised; but the intensity of a shock wave also decreases faster than does that of a sound wave, because some of the energy of the shock wave is expended to heat the medium in which it travels. The amplitude of a strong shock wave, as created in air by an explsion, decreases almost as the inverse square of the distance until the wave has become so weak that it obeys the laws of acoustic waves, Shock waves alter the mechanical, electrical, and thermal properties of solids and, thus, can be used to study the equation of state (a relation between pressure, temperature, and volume) of any material. In the present paper the propagation of strong cylindrical & spherical shock in a uniform medium has been investigated by CCW method for the freely propagating shock. The Relations for the shock velocity, shock strength & pressure are estimated.