불균일 난류 유입유동이 프로펠러형 송풍기의 톤소음에 미치는 영향에 대한 실험적 연구

An Experimental Study on the Effects of Non-uniform Inlet Flows upon Tonal Radiation from an Axial-type Propeller Fan

The acoustic signatures from a propeller fan under non-uniform inlet flow conditions were measured to reveal the mechanism for tonal radiation. Experimental studies were carried out by generating non-uniform turbulent flows with circumferential and radial components of harmonic incoming gust deliberately. This paper reports the measured acoustic power exponents and cross-spectra for circumferential and radial disturbances at a specified flow-rate coefficient.