Question

11. Given that Peak side-on overpressure = 17 psi; time of duration = 0.06 sec 95 feet 70 feet 15 feet Blast Calculate: 1. The shock front velocity (4 points) 2. The length of pressure wave (4 points) 3. The peak dynamic wind pressure. (4 points) 4. What expected physical injury can be anticipated per the UFC 3-340 (2 points)

Answer 1

Given data l- peak side on Over pressure a lapsi duration = 0.06 sec. time of 70 feet 1 Blast 95 feet e M can be written V & speed of finding the shock ware front velocity the formula for shock ware front velocity 10 tit 6* peak side on pressure 7x ambisent sound ही sound for shock wave front velocity is mis & And also the ambient pressure = 14169 psi pressure * the speed of 343.2 get * substitute these values in een velocity the shock wave Tas 14343.2 6 x 17 It 7x14.69 Vi 484.37 m m/s.

' finding the length of pressure th of pressure wave - th of langt wave = ve x time pressure velocity = 484.37x0.06 29.06am iii) finding the peak wind pressure. () :- an P = 1/2 I su Where I = density of air kg E 1.29 lon 13 u a wave velocity = 4984-37 mls. P = #1.29 (48.4.37) q P = 15132.6.22 pascal 151.326 kpa, kpac killo killo pascal Ps