@article {Timushev:2017:0736-2935:4124,
title = "TURBOMACHINERY TONAL NOISE CFD-CAA MODELING IN PRESENCE OF SAS COMPLEX ACOUSTIC IMPEDANCE BOUNDARIES",
journal = "INTER-NOISE and NOISE-CON Congress and Conference Proceedings",
parent_itemid = "infobike://ince/incecp",
publishercode ="ince",
year = "2017",
volume = "255",
number = "3",
publication date ="2017-12-07T00:00:00",
pages = "4124-4133",
itemtype = "ARTICLE",
issn = "0736-2935",
url = "https://ince.publisher.ingentaconnect.com/content/ince/incecp/2017/00000255/00000003/art00016",
author = "Timushev, Sergey F. and Gavrilyuk, Vladimir N. and Aksenov, Andrey A.",
abstract = "In the modern world the system of international air transportation is de-termined in compliance with the requirements of the International Civil Aviation Organization (ICAO) for noise on the ground. ICAO will tighten up these requirements as of December 31, 2017, by 7 EPNdB in the sum
of three control points. The aircraft engine tonal fan noise still has a dominant position on the regimes of take-off and climb. Therefore reducing the fan noise is one of the necessary conditions for aircraft to meet ICAO noise standards. Actually, the most effective technical means are multi-layered
sound-absorbing cellular structures (SAS), which can be installed on the flow path inner surfaces. Optimal parameters of sound-absorbing structures (SAS) and their location can be determined by multi-parametric computations of spatial sound fields for each tonal components of interest. For
the practical solution of this problem authors propose a new high-performance numerical modeling method of three-dimensional acoustic field of a tonal component on blade passing frequency and its higher and combined harmonics generated by the fan. It can be used as well to compute tonal noise
of fans of computer devices, air conditioning systems. The method is based on solving a boundary value problem for Fourier transformed convective wave equation with complex variables in a Cartesian coordinate system in the arbitrary domain with complex impedance boundary conditions. The noise
source is obtained by unsteady CFD acoustic-vortex ap-proach. There are shown examples of the method validation and application.",
}