Research On The Blast Power Characteristics Of Several Typical Solid Thermobaric Explosives In Different Environments

This thesis mainly investigated the blast power properties of several typical solid thermobaric explosives by the ways of theoretical analysis, numerical simulation and static detonation tests both in confined space and in opened space. Here were the main research results:The effect laws of contents of aluminum and Potassium perchlorate (KP) on the after-burning of thermobaric explosives. And the effect laws of aluminum content on the heat of explosion and detonation temperature were acquired by means of theoretical calculations.Through the static explosive experiments in confined space, we analyzed three aspects: First, the effect of aluminum powder content and aluminum powder particle size on the explosion shock wave parameters of thermobaric explosives. Second, the effect of the aluminum content on the after-burning temperature of thermobaric explosives. Third, the quasi-static pressure caused by the thermobaric explosive. Here were the details of the results: As the aluminum powder content increased, the shock wave overpressure and impulse were increased at first and then decreased, and the shock wave overpressure and impulse reached a maximum when the aluminum powder content was about ten percent. As the aluminum powder particle size increased, the shock wave overpressure was decreased while the impulse increased. With the aluminum content increased, the after-burning temperature was increased as well.In order to research the parameters of shock wave, temperature and explosion fragments of solid thermobaric explosives, we tested three types of solid thermobaric explosives by using the piezoelectric measurement system, temperature-measuring system which based on the multi-wavelength pyrometry and multi-channel electronic measurement system in field static explosive experiment. With the high-speed photography, we observed the development process of explosion fireball. The factors affecting about the detonation performances of loading test pieces were also studied.Numerical simulations were accomplished for the process about static detonation of thermobaric explosive both in confined space and in opened space utilizing the AUTODYN, which was a finite element analysis program. Compared with the experimental results, the overpressure and the impulse of 1# and 2# thermobaric explosives were lower than the actual results. While the numerical simulation result of 3# thermobaric explosive shows that the shockwave curve was in good accord with the experimental result. Shock wave cloud image showed that within 11ms, there were twice reflection in the sidewall surface, twice reflection on the top and twice focus in the space. And the pressure of the first focus point reached a maximum of 4.78×103 kPa in confined space.The explosion products of thermobaric explosive in the confined space were analyzed based on the X-ray diffractometer. And we designed a calibration method of multi-line temperature measurement system.