スクロールレス薄型遠心送風機の騒音に関する研究 : 面積比,熱交換器形状,羽根の材質の影響

概要

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The relation between the sound pressure level of a centrifugal fan without scroll casing and the flow around the impeller was investigated in flow rate operating region with respect to the effects of three parameters : (1) the areal ratio, Ar (Ar=1.25,1.0,0.8), (2) the geometory of the heat exchanger, (3) the blade material. It is shown that there is little diference among three area ratios and between the porus material blade and resinous blade. The rotational speed of the fan in the apparatus with rectangular heat exchanger must be increased of about 7% than that with circular heat exchanger to obtain the regulation flow rate (Q=18m^3/min). Therefore the noise radiated from the former is higher than the latter. The agreement between the measured values and the predicted values of the sound pressure level of the turbulent noise was satisfactry.