@article{oai:nagasaki-u.repo.nii.ac.jp:00014627,
 author = {佐々木, 壮一 and 福田, 雅治 and 向井, 将伍},
 issue = {76},
 journal = {長崎大学工学部研究報告, Reports of the Faculty of Engineering, Nagasaki University},
 month = {Jan},
 note = {In order to clarify relation between discrete frequency noise and non-homogenous circular wake of a propeller fan which is used in a rectangular casing, the characteristics of the propeller fans were analyzed by measurement of internal flow. The absolute velocity of main flow domain in the meridional plane of the propeller fan became 30 m/s while the velocity of the inclined plane in the case of 40 degree was decreased to 25 m/s. The velocity fluctuations on the vertical plane in the wake were weakened at the diagonal line of the duct by the velocity deformation formed to the circumferential direction around the impeller. Then the circular wake formed in the propeller fan was broken by the velocity deformation. It is considered that the discrete frequency noise of the propeller fan in the second harmonics became large because the fourteen dynamic rotors and the pseudo four stators made by the non-homogenous circular wake resonated., 長崎大学工学部研究報告, 41(76), pp.1-6; 2011},
 pages = {1--6},
 title = {プロペラファンの非一様な環状後流と離散周波数騒音},
 volume = {41},
 year = {2011}
}