Putting this things on the glider wings is well known for atleast two decades. We call it turbolator. It is a zig-zag tape. If put correctly in the area of boundary layer separation, it prevents abrupt transition from laminar to turbolent airflow. Performance of the glider gets a bit better.
Last eight, ten years some people started to R&D so called deturbolators. These devices make wing ofa glider with wortmann profiles 15 to 18% more efficient, meaning better L/D at higher speed for given glider.
If you are interested go and get some info on this page:
http://www.deturbulator.org
If flying were the language of man, soaring would be its poetry.
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