106 シロッコファンの空力特性と騒音特性に関する研究(振動・騒音の実験・解析技術(2),騒音・振動改善技術)

概要

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The effects of a volute angle of scroll casing and a groove hollowed out on the suction surface of blades on characteristics of aerodynamics and noise of a sirocco fan was investigated. It was shown that in the characteristics of aerodynamic and noise, the optimal value has the volute angle in about 5〜6 degrees, and the grooved blade fan is superior in aerodynamic characteristics and noise to ordinary blade fan. If the groove is hollowed out on the blade suction surface, the width of a wake will become narrow. Consequently the pressure and efficiency of the fan will increase a little, and a sound pressure level and a specific noise level become fall. Therefore, it became clear that the grooved blade fan leads to a characteristic improvement of the fan.
2005-07-06