- Problem 3 15 Marks In Some Wind Tunnels The Test Section Is Perforated To Suck Out Fluid And Provide A Thin Viscous 1 (173.4 KiB) Viewed 27 times
Problem 3: (15 marks) In some wind tunnels, the test section is perforated to suck out fluid and provide a thin viscous boundary layer. The test section wall in Figure below-left contains 1200 holes of 5-mm diameter each per square meter of wall area. The suction velocity through each hole is V₂ = 8m/s, and the test-section entrance velocity is V₁ = 35m/s. Assuming incompressible steady flow of air at 20°C, compute (a) Vo. (b) V₂, and (c) V₁, in m/s. Extremely simple problem for people with real brains: just use flow rates. D is diameter as it is a circular cross-section wind-tunnel. Dj= 2.2 m Test section D₂=0.8 m Uniform suction L=4m D₂=2.5 m Vo to I fuck Combustion chamber