불균일 난류 유입유동시 프로펠러형 송풍기의 소음원 특성에 대한 실험적 연구

초록

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. The normalized sound powers are measured using in-duct method and decomposed of noise source function and response function. This paper reports the measured acoustic power exponents, the acoustic response functions, and the acoustic source functions at a specified flow-rate coefficient for various non-uniform inlet flow conditions.