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What is the formula for coefficient of drag over a circular cylinder at hypersonic speed?(a) cd = \(\frac {D}{q_∞ S}\)(b) cd = \(\frac {D}{2q_∞ S}\)(c) cd = \(\frac {2D}{q_∞ S}\)(d) cd = Dq∞SThis question was posed to me during an online exam.Question is taken from Time-Marching Technique topic in section Time-Marching Technique of Aerodynamics

Answer»

Right CHOICE is (a) cd = \(\frac {D}{q_∞ S}\)

To elaborate: At HYPERSONIC speed, COEFFICIENT of DRAG over circular cylinder can be predicted using the Newton’s THEORY. It is given by:

cd = \(\frac {D}{q_∞ S}\)

Where, S = 2R is the cross – sectional area and R is the radius of the cylinder

cd = \(\frac {4}{3}\) which is obtained using Newton’s theory.



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