Effects of Base Cavity Depth on a Free Spinning Wrap-Around Fin MissileConfiguration

摘要

This study investigated the role base cavity depth plays in altering the overallsubsonic aerodynamic forces on a free spinning axisymmetric body with wrap around fins. Wind tunnel usage allowed the forces to be monitored for varying base cavity depths and angles of attack. A base cavity depth analysis was also performed on a non-spinning axisymmetric body for comparison. Oil visualizations were conducted on the non-spinning configuration to further describe airflow patterns around the body and within the cavity. Results revealed that the aerodynamic forces, mostly drag, changed with increasing cavity depth but not to the extent previously believed. The force results, in conjunction with the flow visualizations, suggested that base cavities have very similar effects on spinning and non-spinning configurations.