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Unformatted text preview: Angle of Attack of a Blade Element in Forward Flight As discussed in the class, T P T T P T P effecive U U U U U U U = 2245  = arctan (1) Here: sin cos 1 1 s c tw R r + + + = sin sin cos V r V r U s T + 2245 + = cos cos cos V r R V r R U s s P + + 2245 + + = (2) Here s means inflow in the shaft plane. This is made of two components: freestream component Vsin s / R plus the induced inflow component v/ R. Let us compute the numerator of the effective angle of attack. ( 29 ( 29 cos sin cos sin 1 1 V r R R r V r U U s s c tw P T + +  + + + + = (3) Simplify, group sin and cosine terms. Also note that ( 29 sin cos 1 1 c s d d dt d d d dt d = = = = (4) One gets: ( 29 ( 29 {...
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 Spring '10
 frando

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