The first component that will be designed and built is likely to be the wide-angle diffuser. Now that I am resolve to building a blower tunnel (with the option of attaching a smoke unit). I'm ready to start construction etc. While reading up on wide-angle diffusers, I noticed that we have (as of the publishing of the 1977 paper I'm reading) absolutely no idea how they work -- all our techniques are emperical.
Accepting the fact that I'm going to have to use emperical methods, I've taken a look at some historical data and decided that a value of 25-degrees seems pretty reasonable for 2-theta (Mehta, 69). From there, I'll have to use emperical methods.
On an unrelated note: I'll soon be purchasing a centrifugal blower from lowes or something for testing and development, and an airspeed meter.
REFERENCES:
1. R.D. Mehta, THE AERODYNAMIC DESIGN OF BLOWER TUNNELS WITH WIDE-ANGLE DIFFUSERS; Progressive Aerospace Science, 1977, Vol. 18, pp. 59-120.
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