Journal of Aerospace System Engineering (항공우주시스템공학회지)
- Volume 1 Issue 1
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- Pages.73-78
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- 2007
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- 1976-6300(pISSN)
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- 2508-7150(eISSN)
Self-Noise Prediction from Helicopter Rotor Blade
헬리콥터 로터 블레이드의 자려소음 예측
- Received : 2007.02.20
- Accepted : 2007.03.19
- Published : 2007.03.31
Abstract
Self-noise from the rotor blade of the UH-1H Helicopter is obtained numerically by using the Brooks' empirical noise model. All of the five noise sources are compared with each other in frequency domain. From the calculated results the bluntness noise reveals dominant noise sources at small angel of attack, whereas the separation noise shows main noise term with gradually increasing angel of attack. From the results of two different tip Mach numbers with the change of angel of attack, the OASPLs at M = 0.8 show about 15dB larger than those at M = 0.4.
Keywords