Comparison of Debris Trajectory Models for Explosive Safety Hazard Analysis

摘要

This paper presents several topics related to explosive safety hazardous debris trajectory analysis. The scope of the paper is limited to free- flight trajectory analysis and does not include debris ricochet or ground roll models. Following a review of alternative trajectory models, key features of the random orientation (RO) 6-D model are summarized. The RO 6-D model uses drag, lift, and side force components and randomly updates the rigid body orientation of the missile. It has been implemented in the TORMIS and TURMIS computer codes (Twisdale, et al., 1978, 1979, 1981, 1984) for facility risk assessment from wind-borne debris hazards and for fragments and secondary missiles from exploding equipment. An aerodynamic library from existing databases has been developed for fourteen generic missile/debris shapes (including structural components, plates, chunky fragments, and secondary missiles from internal equipment). An analytically derived random tumbling mode drag coefficient (as a function of the axial and cross-flow coefficients) for cylindrical shapes is summarized for use with 2-D transport predictions of chunky fragments.