電子機器の流路構造の影響によるファンの空力騒音変化の数値解析

（吸気口格子形状の影響）

抄録

When using small fans to cool electronic products, it is known that fan aerodynamic noise varies with the flow channel structure upstream of the fan. Fan noise prediction considering air duct structure of electronic product is complicated and difficult. In this study, increase fan noise due to the influence of intake louver shape was analyzed using numerical calculation. When the air intake is slant louver, flow velocity distribution upstream of the fan is non-uniform. Attack angle of the fan blade and fluid force acting on the fan blade fluctuate greatly at the rotational frequency, it turns out that it increases blade passing frequency noise.