Aeroacoustic performance of a scoop inlet

Abbott, J. M.

doi:10.2514/6.1977-1354

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…Experimental research has shown that by extending the lower lip of the inlet to form a 3D "scarf" inlet, the inlet radiated noise will be redirected in such a way as to reduce the noise levels below the inlet (ref. 1). There is, of course, a corresponding increase in the noise levels above a scarf inlet, but the overall acoustic effect is positive since flyover noise radiating to the ground is what ultimately matters.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of the Aerodynamic Performance of Subsonic Scarf Inlets

Abbott

2004

40th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit

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A computational study has been conducted to assess the aerodynamic performance of subsonic scarf inlets. The computations were performed using the WIND 3D Navier-Stokes CFD code. The objective of the study was to investigate the aerodynamic performance of scarf inlets wherein the circumferential extent, , over which the transition from the extended lower lip to the non-extended lip was the primary variable. Other inlet design variables include inlet internal lip thickness and the axial length of the lower lip extension. Inlet performance is computed at takeoff, cruise and static conditions. The results indicate a fundamental change in the nature of the lip flow separation characteristics at takeoff conditions as is reduced from 180 o to 67.5 o . The desire for separation-free performance at static and cruise conditions leads to restrictions on the range of inlet design variables.

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Section: Introductionmentioning

confidence: 99%