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Basics of Fluid Mechanics, 2014a

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506 CHAPTER 12. COMPRESSIBLE FLOW 2–DIMENSIONAL<br />

body. This shock is referred to as the detach shock. The detached shock’s distance<br />

from the body is a complex analysis and should be left to graduate class and researchers<br />

in this area.<br />

12.2.2.8 Oblique Shock Examples<br />

Example 12.3:<br />

Air flows at Mach number (M 1 )orM x =4is approaching a wedge. What is the<br />

maximum wedge angle at which the oblique shock can occur? If the wedge angle is<br />

20 ◦ , calculate the weak, the strong Mach numbers, and the respective shock angles.<br />

Solution<br />

The maximum wedge angle for (M x =4) D has to be equal to zero. The wedge angle<br />

that satisfies this requirement is by equation (12.28) (a side to the case proximity <strong>of</strong><br />

δ =0). The maximum values are:<br />

M x M y δ max θ max<br />

4.0000 0.97234 38.7738 66.0407<br />

To obtain the results <strong>of</strong> the weak and the strong solutions either utilize the equation<br />

(12.28) or the GDC which yields the following results<br />

M x M ys M yw θ s θ w δ<br />

4.0000 0.48523 2.5686 1.4635 0.56660 0.34907<br />

End Solution<br />

θ<br />

δ<br />

Fig. -12.11. Oblique shock occurs around a cone. This photo is courtesy <strong>of</strong> Dr. Grigory Toker,<br />

a Research Pr<strong>of</strong>essor at Cuernavaco University <strong>of</strong> Mexico. According to his measurement, the<br />

cone half angle is 15 ◦ and the Mach number is 2.2.

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