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Question: Air is flowing through a wide channel at Mach 2 at a pressure of 140 kPa. The upper wall of the channel turns through an angle of 8° "away" from the flow leading to the generation of an expansion wave, whereas the lower wall of the channel turns through an angle of 6° "away" from the flow, also leading to the generation of an expansion wave. The two expansion waves interact and "pass through" each other. Find the Mach number, flow direction, and pressure just downstream of this interaction.

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