关键词: 含铝炸药, 超压峰值, 比冲量, 爆炸火球, JWL-Miller参数

Abstract: To study the effect of aluminum powder content on the energy output characteristics of RDX-based aluminized explosives, free-field static explosion tests were conducted on aluminized explosives with aluminum powder contents of 20%, 30%, and 40%. The free-field and ground shock wave overpressures were measured using overpressure sensors, and the propagation processes of incident waves, reflected waves, and Mach waves, as well as the changes in the explosion fireball, were captured using a high-speed camera. Based on the test results, the JWL-Miller parameters of the aluminized explosives were calibrated. The test results show that when the aluminum powder content increases from 20% to 30%, the peak ground reflected wave overpressure and specific impulse of the aluminized explosives change slightly. When the aluminum powder content increases from 30% to 40%, the peak ground reflected wave overpressure decreases by 2.17% to 7.81%, and the specific impulse decreases by 6.07% to 14.06%. When the aluminum powder content increases from 20% to 40%, the maximum diameter of the explosion fireball increases from 6.48 m to 7.12 m, and the time when the explosion fireball begins to shrink increases from 20 ms to 60 ms. The maximum error between the predicted peak overpressure and specific impulse of the 30% and 40% aluminized explosives using the JWL-Miller parameters and the test results is 13.67%, and the average absolute percentage error is 6.89%. This study can provide a research basis for the power field testing of aluminized explosive.

Key words: Aluminized explosives, peak overpressure, impulse, explosive fireball, JWL-Miller