국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Hybrid Wing Body Shielding Studies Using an Ultrasonic Configurable Fan Artificial Noise Source Generating Simple Modes
저자	Sutliff, Daniel, L.;; Brown, Clifford, A.;; Walker, Bruce, E.
Keyword	ACOUSTIC PROPERTIES;; AERODYNAMIC NOISE;; ENGINE INLETS;; FAN BLADES;; NOISE GENERATORS;; SOUND PRESSURE;; THREE DIMENSIONAL MODELS;; TURBOFAN ENGINES;; WIND TUNNEL TESTS
URL	http://hdl.handle.net/2060/20130000448
보고서번호	NASA/TM-2012-217685
발행년도	2012
출처	NTRS (NASA Technical Report Server)
ABSTRACT	An Ultrasonic Configurable Fan Artificial Noise Source (UCFANS) was designed, built, and tested in support of the Langley Research Center s 14- by 22-Foot wind tunnel test of the Hybrid Wing Body (HWB) full three-dimensional 5.8 percent scale model. The UCFANS is a 5.8 percent rapid prototype scale model of a high-bypass turbofan engine that can generate the tonal signature of candidate engines using artificial sources (no flow). The purpose of the test was to provide an estimate of the acoustic shielding benefits possible from mounting the engine on the upper surface of an HWB aircraft and to provide a database for shielding code validation. A range of frequencies, and a parametric study of modes were generated from exhaust and inlet nacelle configurations. Radiated acoustic data were acquired from a traversing linear array of 13 microphones, spanning 36 in. Two planes perpendicular to the axis of the nacelle (in its 0 orientation) and three planes parallel were acquired from the array sweep. In each plane the linear array traversed five sweeps, for a total span of 160 in. acquired. The resolution of the sweep is variable, so that points closer to the model are taken at a higher resolution. Contour plots of Sound Pressure Level, and integrated Power Levels are presented in this paper;; as well as the in-duct modal structure.