A jet plane travelling at a velocity of 900 m/s at 6 km altitude where the tempe

Question

A jet plane travelling at a velocity of 900 m/s at 6 km altitude where the temperature and the pressure are -24 degree C and 47.72 kPa. respectively, is to be tested in a pressurized tank of carbon dioxide at 20 degree C. The model is fired like a projectile as shown in figure below and the aim is to the estimate the drag coefficient of the prototype from model testing. If the model tested in the tank is 1/10th scale of the prototype, determine: the required velocity of the model in the tank, in m/s. the required pressure in the tank, in kPa. Note that dimensionless analysis reveals that: Thermophysical properties: Rair = 0.287 kJ/kgK. Rc02 = 0.1878 kJ kgK, kair = 1.4, kco2 = 1.28 mu air = 1.60 Times 10-5 Pa.s, mu co2 = 1.47 times 10-5 Pa.s.

Explanation / Answer

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