The theory of edge scattering
The noise radiated from rotor or fan blades, or a stationary airfoil encountering turbulence, is primarily caused by the interaction of unsteady flow with the leading edge of the blade. In addition, blade boundary layer turbulence can only radiate sound if it encounters a surface discontinuity such as a trailing edge. Both these problems require the detailed analysis of the unsteady flow close to an edge. In this chapter we lay out the details of how edge scattering is calculated so that, in subsequent chapters, we can evaluate leading edge and trailing edge noise.
Schwartzschild solution; Weiner Hopf method; Trailing edge response; Leading edge response
As we discussed in Chapters 6 and ...
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