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| Numerical simulation of limb aerodynamic characteristics for the ejection seat and occupant |
| Received:April 28, 2008 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20103030 |
| KeyWord:shooting escape numerical simulation DES method windblast protective devices aerodynamic characteristics |
| Author | Institution |
| 魏涛 |
南京航空航天大学 航空宇航学院,南京 |
| 张大林 |
南京航空航天大学 航空宇航学院,南京 |
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| Abstract: |
| In order to investigate the effectiveness of windblast protective devices and limb aerodynamic characteristics in the process of shooting. The Reynolds-averaged Navier-Stokes equations are solved by the finite volume method. Central difference scheme is used for spatial discretisation and five-stage Runge-Kutta scheme is applied for temporal discretisation. The Detached-Eddy Simulation (DES) based on Spalart-Allmaras (SA) one equation turbulence model was applied to simulate the aerodynamic characteristics of the shooting seat and person at Mach number 0.6, at Re number of 12.3×106 and the angles of attack varied from-90 to 90 degrees. The results are in good agreement with the wind tunnel experiment results. Then, the limb aerodynamic characteristics were simulated with and without windblast protective devices for Re number of (6.75~13.85)×106, at Mach number ranging from 0.8 to 2.0 and the angles of attack from 5 to 30 degrees. The comparison results show that arm paddles, leg lifters and wind deflector could protect limb,while also bring some unfavorable effects. Consequently, in practice, windblast protective devices should be optimum designed and improved to the best. |
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