Noise data from tests of a 1.83 meter (6-ft-) diameter variable-pitch 1.2-pressure-ratio fan (QF-9)

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论文 Noise data from tests of a 1.83 meter (6-ft-) diameter variable-pitch 1.2-pressure-ratio fan (QF-9) 简介
摘要:Acoustic and aerodynamic data for a 1.83-meter (6-ft.) diameter fan suitable for a quiet engine for short-takeoff-and-landing (STOL) aircraft are documented. The QF-9 rotor blades had an adjustable pitch feature which provided a means for testing at several rotor blade setting angles, including one for reverse thrust. The fan stage incorporated features for low noise. Far-field noise around the fan was measured without acoustic suppression over a range of operating conditions for six different rotor blade setting angles in the forward thrust configuration, and for one in the reverse configuration. Complete results of one-third-octave band analysis of the data are presented in tabular form. Also included are power spectra, data referred to the source, and sideline perceived noise levels. 作者 Glaser, F. W., Wazyniak, J. A., Friedman, R.,
关键字 JET AIRCRAFT NOISE, NOISE MEASUREMENT, NOISE REDUCTION, ROTOR AERODYNAMICS, ROTOR BLADES (TURBOMACHINERY), SHORT TAKEOFF AIRCRAFT, TABLES (DATA), TURBOFANS,
范例 Technical Report
来源 NASA,NTRS, 1975/03/01
语言 English(英语)
大小 7265881 Bytes

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