I'm a student working on Blended-Wing-Body(BWB) shape optimization. Does anyone know how can I get wind tunnel data or other data on BWB? Is there open data for aircraft design?
NASA does quite a bit of aircraft testing. (It's the National Aeronautics and Space Administration, after all).
I'm not familiar with repositories of that sort of data, but you can find technical papers, including those on Blended Wing Bodies in the NASA Technical Report Server, and that would give you contacts to request the data if it wasn't specifically deposited separately.
(disclaimer: I work at a NASA center)