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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2006.11
- 수록면
- 9 - 14 (6page)
이용수
초록· 키워드
오류제보하기
A generalized singularity description of an inhomogeneous wave field for moving surface boundary conditions in arbitrary motion is presented and applied to nonlinear wave propagation and acoustics of rotors in high speed. A nonlinear transonic aerodynamic equation is derived for understanding basic impulsive noise generating mechanisms of rotors in high speed. This equation includes the high-order mathematical singularities in the nonlinear transonic equation in a rotating frame, which is an integral equation with no simple closed-form solution available. The governing equation for high-speed impulsive rotor noise is formulated with a nonlinear velocity potential and this equation governs how local shock waves propagate away from rotating blades. This equation is also useful to explain the phenomenon of delocalization, which is a sudden change of propagation of nonlinear transonic shock waves on a blade to a far-field at a certain Mach number. This delocalization phenomenon is validated with experimental results and explains one of the unsolved acoustic propagation problems. The important aspect of this phenomenon is an introduction of a nonlinear sonic curve concept with respect to nonlinear wave propagation. The effect of the delocalization Mach number on the nonlinear wave propagation of high-speed impulsive rotor noise is investigated.
목차
ABSTRACT
INTRODUCTION
GOVERNING EQUATIONS
CONCLUSIONS
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2009-410-014679040