Micro Air Vortex Generators To Control The Numerical Simulation Of Boundary Layer Problems

A computed study was undertaken to determine the effects of minute vortex generator jets on the zero pressure gradient turbulence boundary layer. The computed problem was the same as the experimental problem of Cheng Xu and K Eaton in 1997. Navier-Strokes equation was solved using SIMPLE method. LAM-Bremhorst K-E was used to simulate turbulent flow.It was indicated in this thesis that a longitudinal vortex would be produced after the jet exhausted from a plate into a boundary layer at a pitch angle and a skew angle. In the boundary, velocity and Reynolds stress was distorted greatly by the vortex that leaded to an upwash domain and a downwash domain. The effects of jet velocity ratio and skew angle were addressed. Several co-rotating minute vortexes on the turbulence boundary layer would coalesce together that leaded to a big vortex. The effect of the big vortex was greater than a single minute one. For several vortex generator jets, the spacing of them was an important factor of effect.