Consider a Lear jet flying at a velocity of 250 m/s at an altitude of 10 km,where the density and temperature are 0.414 kg/m3 and 223 K,respectively. Consider also a one-fifth scale model of the Lear jet beingtested in a wind tunnel in the laboratory. The pressure in the test section ofthe wind tunnel is 1 atm = 1.01 × 105 N/m2. Calculate the necessaryvelocity, temperature, and density of the airflow in the wind-tunnel testsection such that the lift and drag coefficients are the same for thewind-tunnel model and the actual airplane in flight.

Question

Consider a Lear jet flying at a velocity of 250 m/s at an altitude of 10 km,
where the density and temperature are 0.414 kg/m3 and 223 K,
respectively. Consider also a one-fifth scale model of the Lear jet being
tested in a wind tunnel in the laboratory. The pressure in the test section of
the wind tunnel is 1 atm = 1.01 × 105 N/m2. Calculate the necessary
velocity, temperature, and density of the airflow in the wind-tunnel test
section such that the lift and drag coefficients are the same for the
wind-tunnel model and the actual airplane in flight.

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