Turbulent Simulations of Rolling, Pitching and Yawing Rates of a Store with Fins Released from a Wing

• Main Authors: Wei-Ting Liao, 廖偉廷
• Other Authors: Shih-Ying Yang
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/86rteg

碩士 === 國立虎尾科技大學 === 航空與電子科技研究所 === 101 === 　　As for the release of store from the aircraft, it is important that the target is hit and destroyed by the stores. However, it will not be allowed and expected if the mother aircraft is hit and damaged by the store it releases. Consequently, smooth separation of store and aircraft is also concerned. In this article, ESI CFD FASTRAN is the commercial software applied to study the parametric effects of turbulent flows around a store with fins released from a wing. The three-dimensional, unsteady Navier-Stokes equations and k-ε turbulent model are solved in the Cartesian coordinate system. The Chimera two-block grid system is utilized, and grid communication among two blocks are automatically implemented. To evaluate the accuracy of the present calculation, the calculated instantaneous trajectory of center of gravity of store, angles of roll, pitch and yaw, velocity and angular rate are compared with those of experimental data. The satisfactory agreement is achieved. Then, computations of different values of Mach number, both forward and rearward forces applied on the store, single forward force applied on the store, and angle of attack are carried out to investigate the unsteady physical phenomena of separated store. The angle of pitch of store will be reduced and time of maximum angle of pitch will be shortened if Mach number is increased. Meanwhile, angle of yaw will be enlarged and maximum value of pitching rate will be decreased. Time of maximum yawing rate will be shortened as well.