To prevent the initiation failure caused by the uncontrolled fuze and improve the weapon reliability in the high-speed double-event fuel-air explosive (DEFAE) application, it is necessary to study the TDF motion trajectory and set up a twice-detonating fuze (TDF) design system. Hence, a novel approach of realising the fixed single-point center initiation by TDF within the fuel air cloud is proposed. Accordingly, a computational model for the TDF motion state with the nonlinear mechanics analysis is built due to the expensive and difficult full-scale experiment. Moreover, the TDF guidance design system is programmed using MATLAB with the equations of mechanical equilibrium. In addition, by this system, influences of various input parameters on the TDF motion trajectory are studied in detail singly. Conclusively, the result of a certain TDF example indicates that this paper provides an economical idea for the TDF design, and the developed graphical user interface of high-efficiency for the weapon designers to facilitate the high-speed DEFAE missile development.
The missile safety and reliability play important roles in its evaluation and design. Failure or inaccuracy of initiation is an occasional but extremely troublesome hazard in weapon system safety. The uneven fuel distribution and uncontrollable motion of initiation structure are both the causations of this hazard in a double-event fuel-air explosive missile application. Thus, it is crucial to implement the coupling between the initiation structure and the fuel field to succeed in a reliable application. This paper employs CFD to simulate the explosive dispersal process of fuel and uses MATLAB to investigate the motion trajectory of the initiation structure. As for the solid-liquid fuel com-posed of 50 % aluminum powder and 50 % propylene oxide, its optimal concentration for reliable initiation is 186 275 g/m 3 . In the case of a 200 kg missile with a speed of 300 m/s, the results imply that, at 250 ~300 ms which is a reliable initiation time, the initiation structure gets to the reliable range of 10.8 ~14.1 m where the fuel concentration approaches to the optimal range for initiation. Ultimately, for any missile development, the coupled simulation-based approach is summarized to prevent the initiation failure and enhance its inherent safety, so as to avoid accident casualties and property loss.
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