NEAR-WALL STRUCTURE OF 3-DIMENSIONAL TURBULENT BOUNDARY-LAYERS

Modifications to near-wall turbulent boundary layer structure with inc reased three-dimensionality have been investigated through the use of hydrogen bubble wire flow visualization. Results indicate that three-d imensionality does not influence the strength or sign of near-wall str eamwise vortices. Increased three-dimensionality does stabilize the ne ar-wall structure resulting in less ejection type activity. The spanwi se spacing between low-speed streaks also decreased slightly with incr eased cross-flow.