Investigation of the Hydrodynamic Analysis of a Ballistic Body Using Simulator Software

Subject Areas : Dynamic Analysis

مقومی مقومی ¹ , علی کاهید باصری ²

1 - عضو هیات علمی موسسه آموزش عالی دانش پژوهان
2 - موسسه آموزش عالی دانش پژوهان پیشرو

Received: 2016-10-15 Accepted : 2016-11-22 Published : 2017-06-22

Keywords: Angle of attack, Drag coefficient, Lift coefficient, ballistic,

Abstract :

During movement in different flying levels, ballistic objects can endure various forces, which depend on the strength of different parts of the intended body at the time of their design and manufacturing. Among the forces resulting from aerodynamic equations, lift and drag forces could be noted. These two forces depend on characteristics such as the angle of attack. In the present paper, a Shahab-3 ballistic missile (manufactured in Iran) has been evaluated by simulating in the software Najm. This software can be used to analyze the ballistic objects. This work were analyzed in two stages, once with the attack angle of 2 degree and once again with the angle equal to 8 degree. After performing the investigations, it was determined that in the attack angle of 2 degree the forces created in the body of ballistic object do not develop any critical pressure or tension. However, in the attack angle of 8 degree, the lateral pressure starts from the length of 8 m from the object’s tip and it reaches the critical point in the end area, which complies with reality. Moreover, the lift-to-drag coefficient ratio that is considered as a characteristic of aerodynamic analysis is much more suitable for angle of 2 degree.