Applied Aerodynamics by J. Lerner, U. Boldes

By J. Lerner, U. Boldes

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By J. Lerner, U. Boldes

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It is known that the highly unsteady nature of flows associated with vortex shedding make theoretical understanding difficult. It should be mentioned that up to date there are no theories for predicting the drag coefficient as a function of Reynolds number in vortex shedding conditions of extremely basic bodies such as circular cylinders. In some studies about aerodynamic efficiency of Gurney flaps it is common to find the assumption that the effect of the asymmetry of the vortices on lift to drag ratio is detrimental.

Suit-B exhibits more CL value in both positions than Suit-A. Also L/D values of Suit-B are higher than that of Suit-A. Thus a little aerodynamic benefit is noted with Suit-B. 2% with respect to Suit-A. 44 m by using the simulation approach formulated by Muller & Schmolzer (2002). Two cycling suits were manufactured for the full scale testing. Suits were tested at two widely used cycling positions: road racing and time trial. , 2011b. Drag forces were measured under a range of wind speeds starting from 20 to 70 km/h with an increment of 10 km/h.

In the later stages a quasi-static wake develops, which is quite similar to the wake without Gurney, since this is connected to the part of the period where the Gurney jet is switched off. Note also that the most pronounced peak negative vorticity occurs more in this quasi-static part of the period, whereas the peak positive vorticity is connected to the “puff” that comes from the suddenly starting Gurney. 77·T: Fig. 6. 2 Mechanical mini-flap The untwisted wing model tested, of 60cm chord (c) and 80cm wingspan had a NACA 4412 airfoil.

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