一种尾流消散动态预测的改进算法

尾流间隔是增大跑道容量的主要限制因素之一，为了在保持安全水平的前提下有效地增大跑道容量，可以对尾流消散进行动态预测，并据此缩减尾流间隔。研究了一种尾涡消散动态预测算法，该算法考虑了真实大气的大气分层、湍流、侧风、迎面风、风切变以及地效影响，并用一阶后向差分对该算法进行了离散化改进；在改进算法的基础上，时进近阶段尾流的消散在Matlab中进行了仿真计算；计算结果复现了尾涡的下沉现象和侧风对尾涡传输的线性累积效应。

Improved Algorithm of Dynamic Prediction of Wake Vortex Dissipation

Wake vortex separation is one of the main limitations of runway capacity increment. In order to augment runway capacity while maintaining safety,wake vortex separation can be reduced based on dynamic prediction of its dissipation. Firstly,the author analyzed an algorithm of dynamic prediction of wake vortex,which takes the following factors into consideration ： stratification,turbulence,crosswind,headwind,wind shear and ground effect. Secondly,the author improved the algorithm with backward difference equation and programmed the improved algorithm in Matlab and simulated a case of wake vortex dissipation during an approach of an aircraft. The results of the simulation validated the sinkage phenomenon of wake vortex pair and also revealed the linear accumulation of the lateral position of the vortices,which is under the influence of crosswind.