In-Cylinder Projectiles

摘要

Research achievements include: (1) Evidence of the turbulent nature of theunsteady boundary layer along the barrel of the low-speed simulators and the provision of pressure and velocity data used at the Ernst Mach Inst. in their development of a calculation method; (2) Confirmation of the near-isentropic nature of the gas expansion in the second and third simulators with the largest deviation less than 4% of local measurements; (3) Quantification of the extent to which 40 micron solid particles initially lag and subsequently lead the gas flow in the second simulator and provision of evidence to support clustering of particles with terminal velocity related to the cluster; and (4) Evidence of slight blow-back of gas with consequent increase in wall temperature in front of the projectile; quantification of the rapid temperature increase immediately after the projectile and analysis of results in terms of heat flow and heat-transfer coefficient. Keywords: Interior ballistics, Great Britain. (EDC)