Question

Problem 1 (35 pts): A missile, powered by an ideal ramjet engine with air mass flowrate of 20 kg/s, is traveling vertically upwards at a constant velocity of 600 m/s. The missile weighs 1000 kg and has a diameter of 0.3 m. In addition to its weight (i.e. gravitational force), the missile experiences a drag force, which can be expressed as: FD-0.05 π ρα d2 v, where país the density of air (assume to be 1 kg/m3), d is the missile diameter, and v is its velocity. What is the propulsive efficiency of the ramjet engine if the atmospheric pressure and temperature are 50 kPa and 243 K, respectively?

Please show all steps and calculations performed, and indicate where any values were found (if necessary). Thank you!

Answer 1

5ouchon Given Iha san velocl werg ht 1000 Vo speed of sound cvo)--JaR o 1287 23 4763

Co0 31218 9 20 243TH

Ty、 24493-243 , 606.20 drom cyle thal uhine so