What is the method for calculating the angle Θu in compressible flow?

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SUMMARY

The method for calculating the angle Θu in compressible flow is determined by the surface inclination and the no-penetration condition. Unlike previous examples that require fluid properties post-deflection, this approach focuses on the pressures involved. The discussion emphasizes the importance of understanding the relationship between surface angles and flow behavior in compressible fluids.

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Hello good people!

I'm studying the compressible flow and the book refers to this example. I can't understand how does it calculate the angle Θu?
In the previous example, there is a method to calculate it but it requires all the properties once the fluid is deflected, therefore, that's not the way because they are asking for the pressures.

anything light is greatly appreciated.
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Much like ##\theta_l##, ##\theta_u## is set by the surface inclination due to the no-penetration condition.
 

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