利用有利的侧风条件适度缩减尾流间隔以提升空域容量已成为国际空管研究的热点问题之一.在建立了A320机翼尾涡流场上,基于RANS方法采用RKE涡粘模型对雷诺应力项进行二方程封闭,提出利用UDF(用户自定义函数)编程技术分别施加静风、1 m/s、4 m/s、7 m/s 4个不同侧风风场,在“天河一号”超级计算机上开展数值模拟实验.基于试验数据,分析了不同侧风影响下的尾涡下沉运动、涡量衰减、尾涡横向运动、涡心速度等参数的变化规律.结果表明:受到侧风扰动后,尾涡涡量快速上升,其滚转力矩在短时间内迅速增加,尾涡涡心间距快速减小后又迅速反弹分离.在垂直方向上,尾涡反复上下跳跃,呈现出不稳定性,强侧风时的诱导湍流形成的剪切梯度会造成涡核脱落,涡体迸裂进而快速消散.在水平方向上,尾涡会被强侧风快速吹离主航路,有利于缩减所需的尾流间隔、提高机场运行效率.%It is one of the hot issues for international air traffic control research to utilize advantages of crosswind conditions for reducing the wake separation and enhancing airspace capacity appropriately In this paper,the wake vortex flow field of A320 airfoil is established.Based on the RANS method,the RKE equation is used to close the Reynolds stress term by two equations UDF (User defined function) programming technique is applied in establishing aircraft wake vortex flow field under the crosswind field of static wind,1 m/s,4 m/s,7 m/s respectively.Through the TH-1A supercomputer numerical simulation of wake vortex is therefore implemented.Hence,the evolution trend of the parameters such as the vortex core vertical sinking,the vorticity attenuation,the horizontal motion of the vortex core and the vortex core velocity are analyzed The results show that under the condition of static wind,with the slow sinking of the vortex,vortex vorticity decreases gradually.Under the disturbance of crosswind,the vorticity of vortex and the rolling moment increases rapidly in a short time Meanwhile,wake vortex spacing decreases rapidly after separation and rebound quickly.In the vertical direction,the vortex repeatedly jumps up and down.What's more,the formation of strong crosswind induced turbulence shear gradient will lead to the vortex shedding,vortex bursting and rapid dissipation In the horizontal direction,the vortex will be blown away from the main flight path quickly under the impact of strong crosswind which is of great benefit to reduce the required wake separation and improve the efficiency of airport operation
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