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# ps6 - Massachusetts Institute of Technology DEPARTMENT OF...

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Massachusetts Institute of Technology DEPARTMENT OF MECHANICAL ENGINEERING Center for Ocean Engineering 2.611 / 2.612 Ship Power and Propulsion Problem Set #6, Due December 5, 2006 1. Describe the advantages and disadvantages of using a Gas Turbine vs. a Diesel Engine. 2. Draw a T-S diagram for an inter-cooled regenerative Brayton Cycle. Label the points and explain, in words, each portion of the cycle. Mark on your diagram the area where heat is transferred into the system and where it leaves the system. 3. A simple closed-cycle Brayton engine operates with air as the working fluid. The conditions at the design point are as follows: - compressor inlet temperature, T 1 = 25 °C (300 K) - compressor pressure ratio, p 2 /p 1 = 11 - compressor isentropic efficiency, η c = 85% - turbine inlet temperature, T 3 = 1425°C (1698 K) - turbine isentropic efficiency, η t = 92% - pressure loss, Δ p/p = 6% - mass flow rate of air through engine = 60 kg/s Determine: a. T 2 & T 4 using ideal gas properties b. the ratio of compressor power/turbine power c.

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