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Unformatted text preview: Prof. Daniel J. Bodony AE311, Fall 2011 HW #3 Due 5 pm Monday, September 26, in the AE311 dropbox Problem 1 In a turbofan engine some of the inlet air goes through a set of compressor blades and then exits the engine, thus bypassing the core of the enginethe combustion chamber and the turbine. The ratio of the mass flow rate of air going around the core to that going through the core is called the bypass ratio. You are working on the design of a new engine. The inlet of the engine is circular with a radius of 1.50 m. The exit of the bypass air is an annulus with an inner radius of 0.75 m and an outer radius of 1.25 m. The velocity and density at the inlet and exit may be assumed to be uniform over each surface. The velocity of the bypass air at the exit is 360 m / s and the density is 0.9 times the density of the inlet air. The exit velocity of the air from the engine core is 480 m / s and the density is 0.5 times that of the inlet air. The exit of the core flow is circular. What does the radius of the core flow nozzle exit havetimes that of the inlet air....
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This note was uploaded on 01/26/2012 for the course MUS 130 taught by Professor Lee during the Fall '08 term at University of Illinois, Urbana Champaign.
- Fall '08