研究目的
Investigating the thermal initiation mechanism of a warhead under laser irradiation.
研究成果
With small-scale experiments, the initiation time and critical metal temperature of a shelled PBXN-109 irradiated by a laser were obtained. The numerical model established, based on theoretical analysis, has enough accuracy for engineering applications. The scaling law of the thermal response process can be approximated with that of the thermal conduct process based on a reasonable parameter setting with an accuracy of 10%, as far as this study is concerned.
研究不足
The scaling law analyzed in this paper is only applicable to the thermal response process during laser irradiation, but this does not involve the problems of convective heat transfer under high-speed airflow, removal of the molten shell by the airflow and initiation of the explosive directly irradiated by the laser after shell fusion.
1：Experimental Design and Method Selection:
Small-scale experiments were carried out with shelled PBXN-109 to obtain the initiation time and critical metal temperature under laser irradiation.
2：Sample Selection and Data Sources:
A metal-explosive structure was designed with a metal cover made of 45# steel and PBXN-109 explosive. The time history at the rear center of the metal cover was recorded with a thermocouple.
3：List of Experimental Equipment and Materials:
A containment vessel, a continuous wave (CW) fiber laser with a wavelength of 1075 nm, and a K-type Ni–Cr and Ni–Si thermocouple were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was irradiated at the center of the metal cover until initiation occurred. The laser power that reached the target was between 240–640 W.
5：Data Analysis Methods:
The initiation time and critical metal temperature were analyzed based on the temperature-time curve measured at the rear center of the metal cover.
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