Baseline acoustic levels of the NASA active noise control fan rig

Sutliff, Daniel L.; Heidelberg, Laurence J.; Elliott, David; Nallasamy, M.

doi:10.2514/6.1996-1745

Cited by 21 publications

(10 citation statements)

References 3 publications

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“…Radial modes (n) are computed from a least squares data fit of the radial pressure profile using hardwall Bessel functions as the basis functions. 15 Rotating rake data were acquired for the entire fan speed range and blowing rates.…”

Section: Surface Pressuresmentioning

confidence: 99%

Low-Speed Fan Noise Reduction with Trailing Edge Blowing

Sutliff¹,

Tweedt²,

Fite³

et al. 2002

8th AIAA/CEAS Aeroacoustics Conference &Amp;amp; Exhibit

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Section: Surface Pressuresmentioning

confidence: 99%

Low-Speed Fan Noise Reduction with Trailing Edge Blowing

Sutliff¹,

Tweedt²,

Fite³

et al. 2002

8th AIAA/CEAS Aeroacoustics Conference &Amp;amp; Exhibit

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“…4 The resolution of circumferential modes arise from a Doppler induced frequency shift due to the unique and discrete rotation rate of each m-order imparted by the continuous rotation of the rake. 5 Radial modes are computed from a least squares data fit of the radial pressure profile using the hardwall Bessel functions as the basis functions.…”

mentioning

confidence: 99%

Duct Mode Measurements on the TFE731-60 Full Scale Engine

Sutliff¹,

Konno²,

Heidelberg³

2002

8th AIAA/CEAS Aeroacoustics Conference &Amp;amp; Exhibit

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“…Such computations have been made and compared with ANC test data and reported elsewhere. 6,7 The acoustic pressure contours in the inlet and aft ducts and in their far-eld regions are shown in Fig. 6b.…”

Section: Far-field Directivitiesmentioning

confidence: 99%

Computation of Noise Radiation from Fan Inlet and Aft Ducts

Nallasamy¹

1997

Journal of Aircraft

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This paper examines turbofan noise radiation characteristics of both the inlet and the aft exhaust ducts using solutions obtained from a nite element code. The far-eld principal lobe peak angle variations with mode cutoff ratio, duct Mach number, and external ow Mach number are examined. The predicted far-eld principal lobe peak angle variations compare very well with the available analytical results. It is found that the principal lobe peak angle of the inlet radiation is insensitive to the duct and external ow Mach numbers. In the case of the aft duct, an increase in duct Mach number moves the principal lobe away from the aft duct axis, whereas an increase in external ow Mach number moves the principal lobe toward the aft axis. The solutions (for both inlet and exhaust duct radiation) also show that the fareld radiation principal lobe peak angle is only a function of cutoff ratio and nearly independent of the mode number. The ability of the code to handle ducts with acoustic treatments is also demonstrated.

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Baseline acoustic levels of the NASA active noise control fan rig

Cited by 21 publications

References 3 publications

Low-Speed Fan Noise Reduction with Trailing Edge Blowing

Low-Speed Fan Noise Reduction with Trailing Edge Blowing

Duct Mode Measurements on the TFE731-60 Full Scale Engine

Computation of Noise Radiation from Fan Inlet and Aft Ducts

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