Study on decay characteristics of vertical four-vortex system for increasing airport capacity
Study on decay characteristics of vertical four-vortex system for increasing airport capacity
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DOI：
10.1016/j.ast.2020.106017
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发表时间：
2020-10
影响因子：
5.6
通讯作者：
Junho Cho;B. Lee;T. Misaka;K. Yee
中科院分区：
文献类型：
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作者：
Junho Cho;B. Lee;T. Misaka;K. Yee
飞机尾涡通过自感应下降，使飞行员能够根据前一架飞机的航迹确定尾涡的大致位置。起飞的飞行员可以通过提前旋转并在前一架飞机的爬升航迹处或上方飞行来避免遇到尾涡。这种操作导致两个尾流涡流同时非常接近地存在于空气中的情况。在这项研究中，运输和衰减特性的过程中，涉及的前，后飞机形成的尾涡对之间的相互作用进行了分析。初始条件包括后续飞机的高海拔高度，大涡模拟采用大气湍流条件，以考虑涡核不稳定性和非线性传输和衰减。所获得的结果被用来识别衰变过程，诱导尾涡的快速消散，如合并成一个单一的反向旋转对，快速消散，并形成一个涡环，或不变形的较低的涡对。第三种方法可以有效地用于调整起飞间隔时间，以增加机场的容量。
The wake vortices of an aircraft descend by self-induction that enables a pilot to identify approximate wake location based on the preceding aircraft path. A pilot taking off an aircraft can avoid a wake vortex encounter by performing early rotation and flying at or above the climb path of the preceding aircraft. Such operation results in a situation in which two wake vortices are present in the air simultaneously in close proximity. In this study, the transport and decay characteristic processes involving interactions between the wake vortex pairs formed by the preceding and the following aircraft have been analyzed. The high altitude of the following aircraft was included as initial conditions, and atmospheric turbulence conditions were applied to large eddy simulations to account for the vortex core instability and non-linear transport and decay. The obtained results were used to identify the decay processes that induce the rapid dissipation of wake vortices such as merging into a single counter-rotating pair, rapid dissipation, and formation of a vortex ring with or without deformation of the lower vortex pair. The third process could be effectively used to adjust the take-off separation time for increasing the capacity at airports.