A Research On The Explosion Character Of Multi-point Dispersal Cloud

For the purpose of explosion prevention in industry and development of new conception weapons, the fundamental study of multi-point dispersal explosion has been carried out in combination of experiments with simulations. In this thesis, background and status about fuel dispersal research was firstly summarized, then fuel dispersal experiments were done to study the disciplinarian of fuel dispersal explosion and cloud formation, and the formulas for describing the relationship between the expanding diameter D and the time t(D-t curves)were fitted by the experimental data. In order to analyze the influence of different factors on fuel concentration, a computer program was compiled to simulate the fuel concentration of multi-point dispersal process on the MATLAB platform by combining with the D-t curves. The experiments on multi-point dispersal explosion were done by selecting one of liquid fuels as sample to study the dispersal and cloud formation, the overpressure, impulse and temperature of shock waves with the measurement techniques, such as photography, VXI measurement system of shock wave, infrared thermal imager. It was compared with a kind of explosive mixture and TNT under the same conditions. The results show that the speed of wind has significant influence on the process of fuel dispersal and cloud formation, and the concentration of multi-point dispersal process has presented a gradually decreasing tendency from center to circumference, the concentration effected mainly by dispersal rate but less by the dispersal time intervals and space distribution. It can be seen from the experimental results that in the process of multi-point dispersal explosion, the overpressure produced by the liquid fuel was higher than those of the explosive mixture and TNT, the temperature and impulse were little lower than those of the explosive but higher than TNT.