Welcome to Ecomodder.
It's always entertaining to watch posters go right into the weeds. Let's step back.
An air tunnel at 1/24th scale? How many horsepower does this tunnel have? what's the cross-sectional area of the test section? Vortex generators at 1/24th scale?
Have you looked at
graysgarage? He only posted for 4 months in 2015, so you sort of have to know to look for it; but that is a scenario that has some hope of returning viable results at 1/24th scale — upside down in water with hydrogen bubble jets.
Sawtooth trailing edges are used in High-bypass turbojets to moderate the acoustic signature.