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首页> 外文期刊>The Aeronautical Journal >Wind-tunnel interference effects on a 70° delta wing
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Wind-tunnel interference effects on a 70° delta wing

机译:风洞干扰对70°三角翼的影响

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摘要

This paper considers the effects of both wind-tunnel walls and a downstream support structure, on the aerodynamics of a 70° delta wing. A RANS model of the flow was used with the wind-tunnel walls and supports being modelled with inviscid wall boundary conditions. A consistent discretisation of the domain was employed such that grid dependence effects were consistent in all solutions, thus any differences occurring were due to varying boundary conditions (wall and support locations). Comparing solutions from wind-tunnel simulations and simulations with farfield conditions, it has been shown that the presence of tunnel walls moves the vortex breakdown location upstream. It has also been seen that vortex strength, helix angle, and mean incidence also increase, leading to a more upstream breakdown location in wind-tunnels. The secondary separation line was also observed to move outboards. It was observed that for high Reynolds numbers, with a support downstream of the wing, vortex breakdown can be delayed due to blockage effects providing the vortices do not impinge on the support. This was observed to be the case for smaller supports also.
机译:本文考虑了风洞壁和下游支撑结构对70°三角翼空气动力学的影响。流动的RANS模型与风洞墙和支撑一起使用,而墙的边界条件不可见。使用域的离散化,以便网格依赖性效应在所有解决方案中都是一致的,因此发生的任何差异都是由于边界条件(墙和支撑位置)的变化而引起的。将风洞模拟和具有远场条件的模拟的解决方案进行比较,结果表明,隧道壁的存在将涡流破坏位置向上游移动。还已经看到,涡流强度,螺旋角和平均入射角也增加,从而导致风洞中的上游击穿位置更多。还观察到辅助分离线向舷外移动。已经观察到,对于高雷诺数,在机翼下游具有支撑物的情况,如果涡旋不影响支撑物,则由于阻塞效应,可以延迟涡旋破裂。对于较小的支撑件也是如此。

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