Page 276 - 48Fundamentals of Compressible Fluid Mechanics

238 CHAPTER 13. OBLIQUE-SHOCK

With the combined tables the ratios can be easily calculated. Note that hand cal-
culations requires endless time looking up graphical representation of the solution.
Utilizing the POTTO–GDC provides a solution in just a few clicks.

+
+-+1"-9

. .

Example 13.11: ),"- -9$ ) 9-)0+ +
and Mach number is 2.85.

Again calculate the ratios downstream after the second shock and the deflection
. .
Similar example as before but here Mach angel is "
angle.
SOLUTION
Here the Mach number and the Mach angle are given. With these pieces of infor-
mation utilizing the GDC provides the following:

c 7 8

4
4
4
+1"
-9)09
9
-9
"
and the additional information by utilizing the minimal info button in GDC provides
"1+ +

c 7 5 7 8

7 8

4
4
7 8
"
-9
90
-"
9-)19
the so called reflective shock provide the
"1+ +
9
following information 9
7

With the deflection Angle of c
5

c 7 8

4
4
4
9 -"
-9-)19
" " " -"1
and the additional information of 90" 9 7 8 ")190+-"

+1 7 8 7 8 ")190+-"

5

4
4

5
7
c
9
91"
"
-9-)19
-"1
"
1"1
")

7

90 +1

1"

. .

. .