@techreport{oai:jaxa.repo.nii.ac.jp:00045204,
 author = {西脇, 英夫 and 武田, 克巳 and NISHIWAKI, Hideo and TAKEDA, Katsumi},
 month = {Oct},
 note = {A scale model of a 1.5m dia. two-bladed windturbine was used in an anechoic chamber that provided a free-stream velocity of 8m/s. The blades used were a 1.5/8 scale model of a test machine for a local energy utilization project promoted by the Science and Technology Agency. The height of the tower from the ground level was 1.8m. The acoustic measurements were made in a circle of 1.6m downstream from the machine at the height of the windmill centerline. The noise level of the on-axis spectra was about 15dB larger than that of the offaxis. This is a result of the dipole nature of the acoustic impulse. The Wortmann airfoil (FX 77-W series) was employed for the blade profiles and the Reynolds number was 10(exp 5), based on the tip chord length. The experiment revealed that the sound intensity at each harmonic was not proportional to the axial and radial extents of the wake. The elliptic slender configuration was the quietest, while the square configuration was the loudest. From a practical point of view, it is suggested that the circular section is most suitable for the tower leg., 資料番号: NALTR0945000, レポート番号: NAL TR-945},
 title = {TOWER WAKE/BLADE INTERACTION NOISE OF A WIND TURBINE},
 year = {1987}
}