Abstract <p>The interaction of a streamwise vortex generated by a jet vortex generator with a flat-plate turbulent boundary layer is studied experimentally. The measurements are mostly performed using the PIV method. The results are used to obtain Reynolds stresses and analyze their contribution to the Navier–Stokes equations. Data analysis yields integral dependences characterizing the influence of the streamwise vortex intensity on the turbulent boundary layer. It is found that the presence of the jet vortex generator can lead to a decrease in energy dissipation in the turbulent boundary layer.</p>