Since the configuration under consideration is slender, the slope at any point is of the order of ratio of length to diameter of the body.
 |
14.2 |
Hence, 
= Slenderness Ratio
Therefore,
 |
14.3 |
However, u' << V∞, which leads to,
 |
14.4 |
Let a∞ be the freestream speed of sound,
 |
14.5 |
Hence, Strength of the disturbance in the flow relative to 
is of the order of 
. This expression also provides information that is a hypersonic similarity parameter. This information is fetched only from the boundary conditions.
We can express the steady Euler Equations in terms of the perturbation velocities, u’ and v’ forsteady flow,
 |
14.6
|