DISPLACEMENT EFFECT IN PITOT-TUBE MEASUREMENTS IN SHEAR FLOWS

Measurements of velocities in the boundary layer of a wind tunnel usin g square-nosed, round and elliptical Pitot tubes of different sizes ar e reported. The displacement of the effective centre from the geometri c centre of the Pitot tube is found to be different from those given b y some of the available relationships. A simple model has been develop ed for the functional form of the correction for the displacement effe ct and all available data on square-nosed Pitot tubes used to arrive a t a method of correcting for the displacement effect in case of Pitot tube measurements in shear flows.