Research On The Flow Field Of Weapon Bay And The Trajectory Of Missile Separating

The buried weapon bay is a significant component of a bomber. As the missile drops from the weapon bay, it will be influenced by the flow field in the semi-closed space and nearby zone. Its attitude may be transformed rapidly, or it may be lifted by the flow, that will lead to tragic collision destroying the plane. The flow field in the weapon bay is complicated. The trajectory of the missle is hard to predict. The research in this domain is becoming more and more popular. The wind tunnel test is traditional. The computational fluid dynamics is newly developing. Both of them are important method to study this domain. This paper makes use of both method.In this paper, research is made to study the flow field of the buried weapon bay during the process of the releasing of the missile. A three-dimensional model based on B-52 is built by CATIA, which has a missile in its cavity. The model is meshed and the CFD software, FLUENT, is used to calculate the flow field. The trajectory of the missile is obtained, so are the contours of pressure and velocity, the streamtraces diagrams of the slice, and the aerodynamic forces at several points in time. The condition of different angle of attack, yaw, altitude are concerned, so is the ejected one.On the other hand, drop testing in wind tunnel is made. The dynamic similarity criterion and the relation between the parameters of similar flow field is introduced. The design of the missile model and the process of its assembly&debugging and the design of pylon is expounded. The equipment and the process of the wind tunnel test are briefly introduced. The result of the testing is compared with the one of the calculated.