碩士 / 國立虎尾科技大學 / 航空與電子科技研究所 / 102 / 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, the commercial software ESI CFD FASTRAN is applied to study the parametric effects of inviscid flows around multiple stores with fins released from a wing. The three-dimensional, unsteady Euler equations are solved in the Cartesian coordinate. The Chimera multi-block grid system is utilized, and grid communication among multiple blocks is automatically implemented. To evaluate the accuracy of the present calculation, the calculated one-store 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, the number of store is increased. As far as the two-store is concerned, two parameters are carried out to investigate the unsteady phenomena of separated stores. The first one is to increase the forward ejector force and keep rearward ejector force invariant, while the other one is to increase not only the forward ejector force but also the rearward ejector force. Comparing the middle store of three-store calculation with that of original one-store calculation, both backward movement and movement toward wingtip are increased. According to the pilot''s view, the middle store in rotated counterclockwise first and counterclockwise follow up. Eventually, it is re-rotated counterclockwise approaching the end of calculation. The angle of pitch of middle store is enlarged. The maximum angle of yaw is increased and its time is shortened. Both backward velocity and lateral velocity toward wingtip are increased. The maximum values of rolling rate, pitching rate and yawing rate are increased, whereas the minimum value of pitching rate is decreased.
| Identifer | oai:union.ndltd.org:TW/102NYPI5294008 |
| Date | January 2014 |
| Creators | Qing-Hao Chen, 陳卿豪 |
| Contributors | 楊世英 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 126 |
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