COMPARISON OF THE CALCULATED AND MEASURED ROLLING MOMENTS OF THE MISSILE MODELS WITH WRAP-AROUND

AND FLAT FINS

EMRAH GÜLAY

ROKETSAN Missile Industries Inc., P.K.:30, 06780 Elmadağ-Ankara-Türkiye, egulay@roketsan.com.tr,

ALİ AKGÜL

ROKETSAN Missile Industries Inc., P.K.:30, 06780 Elmadağ-Ankara-Türkiye, aakgul@roketsan.com.tr

JOVAN ISAKOVIĆ

Military Technical Institute, Belgrade-Serbia, v@b.rs

SLOBODAN MANDIĆ

Military Technical Institute, Belgrade-Serbia, msmanda@open.telekom.rs

Abstract: Rolling moment of the missiles with wrap-around fins (WAF) is investigated in details in available literature. This rolling moment appears even at zero angle of attack and zero cant angles of the wrap-around fins. Direction of this moment is to the centre of the curvature of the fins at subsonic speeds and changes the sign at supersonic speeds. The value of this moment depends of the fins deployment angle, body diameter at the fins position relative to the missile caliber and position of the fins section relative to the missile base. The comparisons of the calculated and measured rolling moments created by wrap-around fins, for concrete missile model, is given in this paper. The calculated values of the rolling moment are obtained by Computational Fluid Dynamics (CFD) analysis. Measurements of this rolling moment for two models with wraparound fins and one model with flat fins are done in T-38 blowdown wind tunnel of the Military Technical Institute Belgrade. There are very well agreement between calculated and measured rolling moment.