Shock front velocity

At times it is necessary to have a feel for overpressure as it relates to shock front velocity [49]. (See Figure 7-60). Note especially that for a reasonable detonation velocity the peak overpressure could be in the range of 700 to 1000 psi and when referenced to Figure 7-60, the extent of industrial damage would be catastrophic. The use of scaled distance is illustrated in Ref. [41]. 

Figure 7-60. Shock front velocity as a function of peak overpressure at sea ievel. By permission, Report HNDM-1110-1 -2, U.S. Army Corps of Engineers, 1977, Huntsviiie, AL [49].

Particle velocity, u Shock front velocity, U Dynamic pressure q = p u /2... 

In the free field, the blast wave from an explosion travels at or above the acoustic speed for the propagating medium. TM 5-1300 provides plots of shock front velocity vs. scaled distance for high energy TNT explosives. There are no similar plots available for pressure wave propagation. However, for design purposes it can be conservatively assumed that a pressure wave travels at the same velocity as a shock wave. In the low pressure range, and for normal atmospheric conditions, the... 

Fra. 16. Shock front velocity as a function of distance from diaphragm (G6). 

If the front moves at the idealized shock front velocity, given by Equation (14.18), then hr = hu 2nd the times and positions of the front are related as... 

FIG. II-4. Additional side-on blast parameters for TNT U shock front velocity (m/s) u particle velocity behind the shock wave (m/s) Q dynamic wind pressure (Pa) b decay constant. 

In this section, we will study the immiscible, constant density flow through a homogeneous lineal core where the effects of capillary pressure are insignificant. In particular, we will derive exact, analytical, closed form solutions for the forward modeling problem for a single core. These solutions include those for saturation, pressure and shock front velocity, for arbitrary relative permeability and fractional flow functions. We will determine what formations properties can be inferred, assuming the existence of a propagating front, when the front velocity is known. The Darcy velocities are... 

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