1439 
flow around a corner P, which is known as Meyer-corner (Prandtl 
and Meyer, see Ref. 8, page 243). The reflected wave therefore 
is a Machwave produced at point P. 
The problem which will be investigated here is not so much 
the pressure distribution behind this reflected wave but rather 
at what. angles of incidence this whole assumption ceases to be 
correct. It can be derived 
and therefore as conditions for the Mach angle 7 ~ /3r p14 
Ain (pry) = aes eee (10) 
v! U tm O 
It further can be found 
ep = Ut rm @ (11) 
D/eos @ —- wu cos @ 
From (10) and (11) an equation for 77 can be derived 
2 
(D-us*@) Amypos (Uu AN OrO)wmyp =-~a«s@® (32) 
This is a quadratic equation for sin7 and real solutions will 
exist with the exception of the case when the expression under 
the square root in the solution becomes negative. The boundary 
between both cases is given by: 
iat 
