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9.20
From Appendix A: For M1 = 3, = 36.73
From the θ-β-M diagram, Fig. 9.9, with θ = 20° and M2 = 4.3, we have β = 31.5o
The pressure downstream of the shock wave is lower than the pressure
9.21 The flow through an expansion wave is normally isentropic. If
condensation occurs, however, the flow is no longer isentropic. We can assume,
Thus,
For an ambient pressure of 1 atm = 2116 lb/ft2, and a temperature of 520oR, we
have
From the given saturation curve information, at point A, = 38.16 lb/ft2.
Thus, the mole fraction of water vapor in the air is
This slope is smaller than the slope of the saturation curve at point A, given as
(b) Considering a normal shock with conditions upstream of the wave
Thus, behind the shock,
Across the shock, we have
This slope is smaller than the slope of the saturation curve at point A, given as
