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On the Drag Reduction of Trucks through the Application of Fences and Momentum Injection
Technical Paper
912574
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English
Abstract
The paper studies effectiveness of two fundamentally different concepts of boundary-layer control for reduction of drag of bluff bodies: Moving Surface Boundary-layer Control (MSBC) involving momentum injection delaying separation; and tripping of the boundary-layer, using judiciously located fences, to interrupt pressure recovery. Wind tunnel tests, with two-dimensional models of rectangular prisms and 1/12 scale model of a typical tractor-trailer truck configuration, show both the approaches to be quite effective promising a significant reduction in the aerodynamic resistance. A flow visualization study, conducted in a closed circuit water tunnel using slit lighting and polyvinylchloride tracer particles, complements the wind tunnel tests. It shows, rather dramatically, effectiveness of the boundary-layer control procedures.
Authors
Citation
Modi, V., Ying, B., and Yokomizo, T., "On the Drag Reduction of Trucks through the Application of Fences and Momentum Injection," SAE Technical Paper 912574, 1991.Also In
References
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