Calculation method for quasi-static pressure of annular composite implosion of active materials and explosives

In order to predict the quasi-static pressure of internal explosion in a closed environment composed of aluminum containing active materials and explosive rings, this paper summarizes the existing quasi-static pressure calculation models for hydrogen, oxygen, and nitrogen explosives considering post ignition effects, and proposes an optimization method for the quasi-static pressure calculation mode applicable to internal explosion of aluminum containing composite charges. After obtaining the ideal maximum reaction heat using the Geiss theorem, this method uses a parameter correction related to the aluminum containing composite explosive itself. Taking Herzog as an example, a specific prediction formula is provided. Then, composite charges of active materials and explosives, as well as aluminum containing explosives, were tested for implosion. Typical overpressure curves were provided, and the method for obtaining quasi-static pressure in the tests and related sources were explained. The experimental data was compared and analyzed with the quasi-static pressure results calculated by the established optimization model, demonstrating the reliability of the modified model. At the same time, the internal explosion results of two types of explosives were compared, and the calculation model was extended to general aluminum containing explosives. The accuracy of the model was verified using quasi-static pressure data from relevant literature, and the reasons for errors and possible improvement methods were analyzed. The research results show that the established quasi-static pressure correction model for post combustion of composite explosives is in good agreement with experimental and literature data, with an average error of 9.1% and a maximum error of 15.8%; The average error of the calculation results for aluminum containing explosives is 12.1%, with a maximum error of 20.6%.