On the Generation of Side-edge Flap NoiseNational Aeronautics and Space Administration, Scientific and Technical Information Branch, 1981 - Acoustical engineering - 40 pages |
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Page 1
... side edge gap between the flap and the undeflected portion of the airfoil has a significant influence on the intensity of the radiated sound . It is estimated that the noise generated at a single side edge of a full scale part span flap ...
... side edge gap between the flap and the undeflected portion of the airfoil has a significant influence on the intensity of the radiated sound . It is estimated that the noise generated at a single side edge of a full scale part span flap ...
Page
... side edge gap between the flap and the undeflected portion of the airfoil has a significant influence on the intensity of the radiated sound . It is estimated that the noise generated at a single side edge of a full scale part span flap ...
... side edge gap between the flap and the undeflected portion of the airfoil has a significant influence on the intensity of the radiated sound . It is estimated that the noise generated at a single side edge of a full scale part span flap ...
Contents
SUMMARY | 1 |
THE RADIATED SOUND | 9 |
THE INTERRELATION BETWEEN THE SURFACE PRESSURE | 16 |
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Common terms and phrases
1+Mcose 1980 AIAA Paper acoustic frequency spectrum acoustic spectrum aeroacoustic aerodynamic sound Ahtye aircraft airfoil ASPL Asymptotic formulae B(Y₁ Beranek and Newman boundary layer chordwise component contracted acoustic wavelength convected cross-correlation diffracted EQUATION 39 Euler-Mascheroni constant evanescent wave expressed field shape flap of chord flight Mach numbers flyover plane forward flight speed full scale function m(1 Green's function Hankel function Hardin in-board integral interpolation curves K₂ large compared Lorentz contracted acoustic mean width NASA noncompact limit obtained part-span flap radiated sound radiation condition reciprocal source relative root mean square semi-baffled dipole side edge gap side edge noise SIDE-EDGE FLAP NOISE single side edge slotted half-plane sound pressure level source strength span flap span trailing edge spanwise Strouhal number surface pressure fluctuations surface pressure P(x,,X,,t surface pressure spectrum tion turbulent boundary layer turbulent flow undeflected portion unsteady upper surface values velocity wavenumber ws/U y₂