Abstract: The torpedo-rocket separation technology is one of the key technologies for the rocket-assisted torpedo. Research on multi-body aerodynamic interference is fundamental for analysis of torpedo-rocket separation. The multi-body aerodynamic interference is analyzed based on CFD method and wind tunnel tests. The research results show that the high pressure region appears between the forebody and afterbody of torpedo due to the inrush and retardation of airflow once the separating shells stretch, which is beneficial for torpedo-rocket separation. The effect of high pressure region is enhanced with the increase in the open angles of shells, and is weakened with the increase in the space between forebody and afterbody. Thus it's important to optimize the space to improve the safety of torpedo-rocket separation. The separating shells have the effects of converging, extruding and shielding on airflow, which should be taken into consideration in the design of separation scheme seriously. The sideslip angle may cause the stretching asynchronism of the separating shells . For the open angle of 20°, the sideslip angle of 1° results in 11% of difference between the yaw moments of two separating bodies. Key

Key words: ordnancescienceandtechnology, rocket-assistedtorpedo, torpedo-rocketseparation, aerodynamicinterference, CFDmethod