Prediction of aerodynamic noise in a ring fan based on wake characteristics
スポンサーリンク
概要
- 論文の詳細を見る
A ring fan is a propeller fan that applies an axial-flow impeller with a ring-shaped shroud on the blade tip side. In this study, the entire flow field of the ring fan is simulated using computational fluid dynamics (CFD); the accuracy of the CFD is verified through a comparison with the aerodynamic characteristics of a propeller fan of current model. Moreover, the aerodynamic noise generated by the fan is predicted on the basis of the wake characteristics. The aerodynamic characteristic of the ring fan based on CFD can represent qualitatively the variation in the measured value. The main flow domain of the ring fan is formed at the tip side of the blade because blade tip vortex is not formed at that location. Therefore, the relative velocity of the ring fan is increased by the circumferential velocity. The sound pressure levels of the ring fan within the frequency band of less than 200 Hz are larger than that of the propeller fan. In the analysis of the wake characteristics, it revealed that Karman vortex shedding occurred in the main flow domain in the frequency domain lower than 200 Hz; the aerodynamic noise of the ring fan in the vortex shedding frequency enlarges due to increase in the relative velocity and the velocity fluctuation.
論文 | ランダム
- 国語学--そのヨ-ロッパとの比較 (国語学と言語学)
- 1P-052 3α-hydroxysteroid dehydrogenase C端残基の二量体形成や触媒活性に及ぼす影響(蛋白質-物性(安定性,折れたたみなど),第47回日本生物物理学会年会)
- 講演懇談要旨 日本社会と基礎研究
- 大学の新しい姿
- 21世紀の大学に向けて (展望 21世紀の科学技術) -- (創造性を求めて)