尾流冲浪中后机等效诱导升力计算分析

Calculation and analysis of equivalent induced lift in wake surfing

为进一步得到在尾流冲浪中的减阻、节油等效益,提出了一种尾流冲浪中后机获取升力的计算方法,对节油率进行分析。采取数值模拟的方法,选取A330-200机型作为前机和后机,以其适用巡航速度在高空飞行作为背景,模拟了其尾涡的环量、半径以及其产生的下沉运动。根据尾流的耗散规律从2000~4500 m范围中选取了6组前后机纵向间隔,参照不同的后机距涡核的相对位置进行了滚转力矩分析,根据诱导速度等效转化为后机均匀获取的诱导升力,分析评估出合理的后机冲浪位置,得出较高的节油率为12.28%。

In order to further obtain the benefits of drag reduction and fuel saving in wake surfing,this paper proposes a calculation method for obtaining lift from the rear engine in wake surfing to analyze the fuel saving rate.This article adopts a numerical simulation method,selects the A330-200 model as the front and rear aircraft,and uses its applicable cruise speed as the background for high-altitude flight,simulates the circulation,radius,and sinking motion of its wake vortex.Based on the dissipation law of the wake,6 sets of longitudinal intervals between the front and rear engines were selected from the range of 2000 meters to 4500 meters.Rolling torque analysis was conducted with reference to the relative positions of the rear engine to the vortex core.The induced speed was equivalently converted into the induced lift uniformly obtained by the rear engine.Finally,a reasonable rear engine surfing position was analyzed and evaluated,and a high fuel saving rate of 12.28%was obtained.