![]() ![]() Index balancing may be used to eliminate the unbalance errors in an end-drive adapter, for biasing an arbor or for improving the residual unbalance in a rotor mounted on an arbor. Geitner P.ENG., in Machinery Component Maintenance and Repair (Fourth Edition), 2019 Index-balancing procedureĪ procedure of repetitively balancing and indexing (by 180 degrees) one component against another leads to diminishing residual unbalance in both, until eventually one component can be indexed against the other without a significant change in residual unbalance. Ratio between the tangential velocity at the tip of the rotor and the wind speed far upstream (tip speed ratio) Ratio between the local tangential velocity of the rotor and the wind speed far upstream Relative velocity on the airfoil which is the combination of the axial and the tangential inflowĪngle of attack at which c l,desjgn is obtainedĪngle of attack at which c, design, blade is obtainedĪngle between the relative inflow and the rotor plane Wind speed far downstream in the rotor wake Maximum thickness of airfoil measured orthogonal to the chord Pressure far upstream and downstream of the rotor Height above ground at which the wind speed is measured (commonly 10 m) Lift–drag ratio at which c l,design,blade is obtainedįorce coefficient on airfoil driving the rotor – parallel to rotor planeįorce coefficient on airfoil contributing to rotor thrust – orthogonal to rotor plane Maximum lift–drag ratio for airfoil section Lift coefficient at which (c //c d) design is obtained (design lift) Tangential interference factor in rotor planeĬhord length or distance from extreme leading edge to extreme trailing edge of airfoil Pressure in the rotor plane on the upstream side ![]() Parameter in the Weibull distribution determined from measurements Height above ground at which the wind speed is measured (commonly 10 m) H Pa Stagnation pressure Height above ground at which the wind speed will be modeled Lift-drag ratio at which c l, design,blade is obtainedįorce coefficient on airfoil driving the rotor -parallel to rotor planeįorce coefficient on airfoil contributing to rotor thrust - orthogonal to rotor planeĮxponent in the Prandtl tip correction formulaįorce per length unit in tangential direction on an airfoil section Maximum lift-drag ratio for airfoil section Lift coefficient used to design the blade (blade design lift) Lift coefficient at which (c/c d) design is obtained (design lift) Parameter in Weibull distribution relating to the mean wind speedĬhord length or distance from very leading edge to very trailing edge of airfoil Induced tangential velocity in rotor plane ![]()
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