Steady Identification Method of Explosion Heat Measurement by Isothermal Calorimeter

In view of the problems of the classical measurement method of constant temperature explosion heat, such as long measurement time, system failure and so on, a solution of identifying explosion heat based on prefault data was proposed. Initially, the heat transfer equation of calorimeter based on the hypothesis of explosive transient response was established, and the change rule of water temperature in inner barrel was obtained after solving. Based on the thought of system identification, the system identification method was obtained, which firstly identifies the indirect parameters of kNW/(cNmN), u1, λ1, λ2, secondly identifies the target parameters of TE(τM), kNZ/cNmN, kNZ/cZmZ, thirdly identifies the correctional raising temperature and explosion heat. The error analysis shows that the identification value of explosion heat can converge to the classical value steadily, and the influence of non transient reaction such as oxidation and combustion on the identification accuracy can be ignored. Ultimately, 8 kinds of typical explosive samples were simulated and analyzed, and the criterion of convergence time was proposed. The simulation results show that the identification value of detonation heat can converge to the classical value quickly and reliably under the condition of less than 3% relative error and 1/2 of the main and final stage. The test criterion can judge the convergence time of the identification value of detonation heat reliably and effectively reduce the risk of measurement failure caused by system fault. © 2020, Editorial Board of Journal of Explosives & Propellants. All right reserved.