The Von Karman Gas Dynamics Facility at the Arnold Air Force Base in Tennessee has need of a blowdown wind tunnel, to be supplied from a tank containing compressed air initially at 1000. psia and 70.0°F. The wind tunnel is to be at the end of a nozzle attached to the tank and must be 8.00 ft in diameter and have a velocity of 10.0 × 103 ft/s at 2000. R. The tank must be of sufficient size to sustain these wind tunnel conditions for a minimum of 30.0 min of testing.
Carry out the preliminary thermodynamic design of such a facility and estimate the size of the storage tank required and the power required to compress the air in filling the tank if it must be done overnight (i.e., in 8.00 h).
Determine the entropy production associated with both the filling and emptying of the tank if both are done isothermally.