In this paper, time-domain computational aeroacoustic (CAA) methods are developed to predict broadband noise generation and propagation by a rectilinear cascade of flat plates interacting with ingesting turbulent gust. Utilizing three-dimensional time-domain CAA model, the three-dimensional characteristics of inflow turbulence noise due to the turbulence-cascade interaction are investigated with an emphasis placed on the effects of wavenumber components of ingesting turbulence in the span-wise direction. Through the comparison of three-dimensional results with two-dimensional ones, the characteristics of sound pressure spectrums obtained from the three-dimensional results are revealed, which is mainly due to the different dispersion relations of acoustic waves in two- and three-dimensions. These differences between two- and three-dimensional results become more significant in the lower frequency components. In addition, some preliminary numerical results on the effects on the broadband noise of a rectilinear cascade of leaned or swept flat plates are illustrated, which can provide basic principle for the low-noise design of the stator in turbo-fan engines.
[1]
C. Tam,et al.
Dispersion-relation-preserving finite difference schemes for computational acoustics
,
1993
.
[2]
F. Hu.
A Stable, perfectly matched layer for linearized Euler equations in unslit physical variables
,
2001
.
[3]
Mei Zhuang,et al.
Optimized Upwind Dispersion-Relation-Preserving Finite Difference Scheme for Computational Aeroacoustics
,
1998
.
[4]
Donald B. Hanson,et al.
Theory for broadband Noise of Rotor and Stator Cascades with Inhomogeneous Inflow Turbulence Including Effects of Lean and Sweep
,
2001
.
[5]
Soogab Lee,et al.
Computation of Broadband Noise of a 2-B Flat-airfoil Cascade Subject to Ingested Turbulence
,
2005
.