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논문 기본 정보

자료유형
학술대회자료
저자정보
저널정보
한국자동차공학회 한국자동차공학회 춘 추계 학술대회 논문집 한국자동차공학회 1999년 추계학술대회논문집 2호
발행연도
1999.11
수록면
587 - 595 (9page)

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Traditionally, intake noise from internal combustion engine has not received much attention compared to exhaust noise. But nowadays, the intake noise is a major contributing factor to automotive passenger compartment noise levels. The main objective of this paper is to identify the mechanism of generation, propagation and radiation of the intake noise. With a simplest geometric model, one of the main noise sources for the intake stroke is found to be the pressure surge, which is a compression wave due to the compressed air near the intake valve after closing. The pressure surge, which has the nonlinear acoustic behavior, propagates and radiates with relatively large amplitude. In this paper, unsteady compressible Navier-Stokes equations are employed for the intake stroke of axisyrmetric model having a single moving piston and a single moving intake valve. To simulate the periodic motion of the piston and the valve, unsteady deforming mesh algorithm is employed. And for the purpose of perfect closing of the intake valve, the numbers of mesh are changed using a Lagrange interpolation. In order to resolve the small amplitude waves at the radiation field, essentially non-oscillatory(ENO) schemes are used. The source of the intake noise can be identified through the visualization of propagation in a finite duct and radiation to the far fields. Comparison with measured data is given for in-duct pressure showing the more agreement than the one-dimensional calculated

목차

Abstract

1.Introduction

2.Governing Equations

3.Numerical Method

4.Results and Discussion

5.Conclusions

References

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