<論文>試作軸流ターボファンの騒音発生とダクト内伝播

概要

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A test axial-flow turbofan is constructed in order to make clear the mechanism of generation of many kinds of fan noise which are encountered in the real turbofan engines. Using this machine the pressure field inside the inlet duct are measured and analysed precisely for the cases of single rotor blade row and of rotor and stator blade rows. In the latter case the number of stator vanes and the axial clearance between both blade rows are changed. The aspects of the pressure field near the rotor blade row which are closely connected with the generation of fan noise are made clear, and the features of the noise propagation inside the inlet duct are also clarified. The results show clearly that other than the noise generated due to the mutual interaction between rotor and stator blade rows there exist those which are considered to be generated due to the interaction between a rotor blade row and inlet flow distortions.