プロペラファンの広帯域騒音に及ぼす羽根車後流の影響

抄録

We predicted the trailing edge noise operating in the maximum efficiency point of a propeller fan by the measured wake characteristics. The relative flow in the design point separated at the pressure surface. In this case, it was deduced that the flow around the impeller may not interact with the neighbor blade. The blade load was distributed on the blade span; the velocity fluctuations of the same operation point became large than that of the off-design point. The results of the predicted noise indicated that the influence of the relative velocity on the trailing edge noise was larger than that of its velocity fluctuation.