Lecture_16 - AOE/ME 4234 Lecture 16 10-10-07 AOE/ME 4234 1...

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AOE/ME 4234 1 AOE/ME 4234 Lecture 16 10-10-07
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AOE/ME 4234 2 Off-Design Modeling Op line Desig n point Off-design modeling requires knowledge of the compressor and turbine pressure-speed-flow characteristic – for example of off-design model see Mattingly, AIAA (“ONX OFFX”)
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AOE/ME 4234 3 Off-Design Modeling Use theorem – Result is – Use Buckingham - π Eqn (A)
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AOE/ME 4234 4 Off-Design Modeling Thus, the performance of a given engine can be represented using Eqn (A) – The thrust and the fuel flow can be determined from independent variables u a , the engine rotor speed N g , and the properties of the atmosphere. Typically, the performance is referenced to the design flight speed u a , N g = 100% and a standard altitude.
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AOE/ME 4234 5 Off-Design Modeling The variable groupings in Eqn (A) reduce to if and design are constant where an d
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AOE/ME 4234 6 Off-Design Modeling The engine performance would need to be known over the range of M, N g , R e , δ and θ to produce the correlation – this could be done by
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Lecture_16 - AOE/ME 4234 Lecture 16 10-10-07 AOE/ME 4234 1...

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