Research of a Sensor Used to Calculate the Dynamic Pressure of Chemical Explosions

To meet the growing demand for shock wave dynamic pressure measurements of conventional chemical explosion, based on the pitot tube measurement principle, a sensor used to calculate the dynamic pressure is designed. The so-called dynamic pressure sensor is an updated model of pitot-static tube and free-field pressure sensor. Based on the principle of dynamic pressure formation in the explosion field and the relationship between total pressure, static pressure and dynamic pressure, using computational fluid dynamics simulation, the aerodynamic characteristics of the sensor are explored, the structural dimensions of the sensor and the installation positions of the sensitive elements are determined. In view of the special environment of the explosion field, a dynamic pressure test system is built, 10kg, 20kg and 30kg cylindrical TNT explosion experiments are completed, the dynamic pressure signal processing methods are proposed and the complete dynamic pressure waveforms are obtained. The final results show that the sensor can effectively measure the dynamic pressure signal, which is essential to improve the dynamic pressure measurement capability and promote the development of new high-energy warheads.