Aerodynamic Drag Improvements on a Simplified Heavy Vehicle using Three-sided Plain and Notched Base Flaps

An experimental investigation has been undertaken to determine the effects of plain and notched base flaps on the drag performance of simplified tractor-trailer combination without any intermediate gap, Generalized European Transport System (GETS). Both plain and notched base flaps are rigid, made up of three identical flaps whose length is equal to the width of the GETS model, and not angled inward or outward. The experiments examined three-sided flap configurations corresponding to various combinations of seven heights of the plain part (from ۱۰ to ۴۰ mm in steps of ۵ mm), four notch amplitudes (from ۲.۵ to ۱۰ mm in steps of ۲.۵ mm), and five notch wavelengths (from ۱۰ to ۵۰ mm in steps of ۱۰ mm). It is shown that the drag performance of the plain flap at zero yaw highly depends on the height of the plain flap. The maximum drag reduction occurs for e/w=۰.۱ yielding a drag reduction of ۱.۹% when compared to the GETS model without flap (baseline GETS). It was shown that the time-averaged drag coefficient increased slightly until a maximum was reached at e/w=۰.۳ but then decreased slightly with increasing e/w. Under zero yaw angle conditions, GETS model with a notched base flap, e۱۰-a۰۵.۰-λ۲۰, gives the lowest drag. The addition of this base flap to the GETS model resulted in a ۲.۸% drag reduction. This notched base flap was shown to be more effective not only at reducing under yawed flow conditions tested but also at reducing time-averaged side coefficient under yawed flow conditions tested, compared to the e۱۰-a۰۰.۰-λ۰۰ flap.

کلیدواژه ها:

Passive flow control ، Drag reduction ، Plain base flap ، Notched base flap ، Simplified heavy vehicle ، Cross-wind