How do i find a supercritical airfoil for my preliminary design? The following information is available but i don't exactly know where to get the information about SC Airfoils from. Do Airbus , Boeing use secret airfoil that they don't disclose?
Cruise Speed = 240 m/s or 0.7 Ma; Chord length = 5.5 meters
Using online tool to get the Reynolds number gives a very high number of about 85 million. Using the standard setting for kinematic viscosity of $1.4207E-5$.
1.How do I find a SC airfoil for a transport jet of about 150 Pa @ 0.7 Ma?
2.Why are my Reynold's number so high? It should be around 25-30 Million.
Answer to the implicit question: Yes, the more recent airliner airfoils are indeed secret. Look for reports like this to see what is out there.
Answer to question 1: Try the linked NASA Technical Paper 2969.
Answer to question 2: Your viscosity is for sea level. Try to use the value for the tropopause and it will be only ⅓ as large.