Calculation and analysis of equivalent induced lift in wake surfing
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 2 000 meters to 4 500 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.
wake surfingnumerical simulationtail vortexinduced speedinduced lift
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