Attenuation in the Shock Tube

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Abstract
By timing the successive arrivals of a shock at stations placed along the channel of a shock tube, measurements have been made of the decrease in shock velocity with travel. These measurements were carried out for shocks moving into air at atmospheric pressure. The attenuation per unit length of travel is greater for stronger shocks and in smaller tubes. Representing distance along the tube by x and using fractional increase in pressure across the shock, (P−P0)/P0=z, as a measure of shock strength, the dimensionless quantity R(dz/dx)/z is found to lie in the interval (3.5±2) ×10−4 for shocks ranging in strength 0.1<zR<3.80 cm. It is believed that this attenuation is due to wall interaction rather than to nonideal rupture of the diaphragm. However, the exact physical nature of this interaction has not as yet been determined.

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