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Why is blade element theory preferred over momentum theory for designing a propeller?(a) Assumes flow inside stream tube as constant(b) Neglects span wise flow(c) Model thrust lag(d) Account for varying blade geometryI had been asked this question in unit test.The above asked question is from Blade Element Theory in portion Helicopter Dynamics of Aerodynamics

Answer»

Correct ANSWER is (d) Account for varying BLADE geometry

Easy explanation: There are several REASONS why blade element theory is preferred over momentum theory. It can account for varying blade geometry, allows torque estimation, allows non-linearities for example lift CURVE to be modelled. The other points are some of the disadvantages.



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