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Unformatted text preview: Propeller thrust: 500000 N a) Compute J, Kt and Ct for this propeller b) Find the maximum possible efficiency for a propulsor of this size. c) Estimate the ultimate wake diameter as well as the average axial induced velocity ua* at propeller disk using actuator disk theory. d) Find the efficiency of an equivalent propeller from Kramer’s diagram. e) Find the efficiency and pitch if the propeller were a B-series 4 bladed propeller (data curves provided). f) Assuming an actuator disk, estimate the induced velocity on the propeller disk at r/R=0.7. g) At r/R =0.7 the Induced tangential velocity is ut*= -0.8 m/s and the circulation at r/R=0.7 is Γ = 7.0 m2/s Using the induced axial velocity from part f find: inflow angle β , wake angle β i, Draw an accurate velocity diagram at r/R=0.7. h) If the chord at r/R=0.7 is 1m and the drag coefficient of the section is Cd=0.008 Find the axial force/span and tangential force/span at this radius....
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This note was uploaded on 02/27/2012 for the course MECHANICAL 2.23 taught by Professor Pauld.sclavounos during the Spring '07 term at MIT.
- Spring '07