1. Consider a low-speed subsonic wind tunnel designed with a reservoir cross-sectional area A, = 2 m2 and a test-section

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1. Consider a low-speed subsonic wind tunnel designed with a
reservoir cross-sectional area A, = 2 m2 and a test-section
cross-sectional area A2 = 0.5 m2. The pressure in the test section
is P2 = 1 atm. Assume constant density equal to standard sea level
density, calculate the pressure (in kPa) required in the reservoir,
P1, necessary to achieve a flow velocity V2: 40 m/s in the test
section.
a. From item no. 1, calculate the mass flow rate (in kg/s)
through the wind tunnel.
b. Calculate the Mach number of the vehicle in air.
c. Calculate the Mach number of the vehicle in hydrogen.