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박호일(Hoil Park),서주봉(Jubong Seo),홍성유(Sungyou Hong),강수영(Suyoung Kang),김장균(Janggyeun Kim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
A flow noise radiating from a compressor housing of a vehicle turbocharge was investigated. The noise was induced by a vortex around the intake area of the compressor wheels - a intake flow noise, realized to be largely affected by a combination of the shape of the compressor scroll and that of compressor wheels by tests. And, its frequency did not increase proportionally to the turbocharger speed, and was located around the range of 1.6㎑ and 1.8㎑ to the whole working area of the turbocharger. Some countermeasures were tried to reduce the noise - helmholtz resonators, the change of the diffuser, the smaller compressor scroll, and a groove around the intake area of the compressor wheels. The smaller compressor scroll could effectively reduced the noise, but was not adopted because of the deterioration of the compressor performance. For the noise reduction, the groove was chosen because it could sufficiently reduce the noise and maintain the performance.