Answer Happy

4. Supersonic wind-tunnels are operated with the use of a blow-down tank, which is a large tank containing air at high pressure and temperature. When the wind-tunnel is turned on, the high pressure and high temperature air flows out of the tank and through the wind-tunnel at high speeds. In this problem, let's consider the process of filling up the blow-down tank. An air compressor is used to fill the 10 ft tank, which initially contains air at 70°F, 1 atm, using air drawn from the atmosphere at 70°F and 1 atm. During filling, the relationship between the pressure and specific volume of the air in the tank is puld=constant. Assuming that the whole system is well-insulated, determine the compressor work required to fill the tank with a total of 1.5 lbm of air. Air 7,- 70°F P = 1 atm Tank Air compressor -V-1012 T= 70°F Pi = 1 atm pul4 = constant