- #1
mLuby
- 8
- 0
Hi Physics Forums!
I would like to know how to model a thin, infinitely-long circular cylinder moving axially at hypersonic speeds. For something I would expect to be a base case in most hypersonics textbooks, it's surprisingly difficult to find a straight answer.
In particular what is the:
• heat over cylinder surface
• drag force on the cylinder
The closest thing I have been able to find so far is GK Batchelor's "The Skin Friction on Infinite Cylinders Moving Parallel to their Length" (1954) which gives a solution for subsonic speeds only. There, the drag force is:
8 • dynamicViscosity • ∫{ [ e(-k2)(kinematicViscosity)(timePeriod) ] / [ k•BesselJ(cylinderRadius•k)2 + BesselY(cylinderRadius•k)2 ] }dk
The closest thing I can think of to model this is that Rods from God idea about de-orbiting telephone poles to hit targets. Unfortunately I can't find much on their aerodynamics either (just religious stuff).
Many thanks!
-mLuby
I would like to know how to model a thin, infinitely-long circular cylinder moving axially at hypersonic speeds. For something I would expect to be a base case in most hypersonics textbooks, it's surprisingly difficult to find a straight answer.
In particular what is the:
• heat over cylinder surface
• drag force on the cylinder
The closest thing I have been able to find so far is GK Batchelor's "The Skin Friction on Infinite Cylinders Moving Parallel to their Length" (1954) which gives a solution for subsonic speeds only. There, the drag force is:
8 • dynamicViscosity • ∫{ [ e(-k2)(kinematicViscosity)(timePeriod) ] / [ k•BesselJ(cylinderRadius•k)2 + BesselY(cylinderRadius•k)2 ] }dk
The closest thing I can think of to model this is that Rods from God idea about de-orbiting telephone poles to hit targets. Unfortunately I can't find much on their aerodynamics either (just religious stuff).
Many thanks!
-mLuby