Reference data for an open wedge
 

I am looking for reference drag data for an open wedge (the geometry shown in this post)

Untill now I've only found data for "closed" wedges, i.e. solid prisms with the back closed. Searching for open wedges on Google Scholar doesn't yield useful results.

Is this geometry maybe called something else than an "open wedge"? Is there some specific term I should be looking for?
I've tried the following terms with no result:

- open wedge
- 2D cone

I'm still looking for the reference data, does anybody have any pointers?