Exhaust duct flow noise simulation

A case study

Jukka Tanttari, Antti Lehtinen, Esa Nousiainen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

Abstract

Exhaust noise is an important component in piston engine power plant environmental noise. It originates from engine as well as from turbulent gas flow in exhaust duct. Flow-related part has been less important but has caught more attention recently. A case study concerning noise of a part of a real exhaust duct was conducted. Simulations were done in several phases with increasing level of model capability and complexity. Steady state CFD provided information of the noise generation regions and levels. Transient CFD, resolving the turbulent structures, was then used to obtain more realistic information of the levels and frequency content. Finally, results from transient CFD were used as a FSP excitation for structural FE-model of the duct connected to exterior sound field. In-duct pressures estimated by transient CFD were in a very good agreement with experimental data from 50 to 500 Hz. It was also noticed that FSP excitation sets very strict demands on structural models because of potential spatial aliasing due to high wave-numbers involved. Correct description of both temporal as well as spatial characteristics of the excitation is essential for valid vibro-acoustic model.
Original languageEnglish
Title of host publicationProceedings of BNAM 2014
Pages554-560
Publication statusPublished - 2014
MoE publication typeD3 Professional conference proceedings
EventBaltic-Nordic Acoustic Meeting, BNAM 2014 - Tallinn, Estonia
Duration: 2 Jun 20144 Jun 2014

Conference

ConferenceBaltic-Nordic Acoustic Meeting, BNAM 2014
Abbreviated titleBNAM 2014
CountryEstonia
CityTallinn
Period2/06/144/06/14

Fingerprint

Ducts
Computational fluid dynamics
Engine pistons
Acoustic fields
Flow of gases
Power plants
Acoustics
Engines

Keywords

  • aero-vibro-acoustics
  • duct acoustics
  • computational fluid dynamics

Cite this

Tanttari, J., Lehtinen, A., & Nousiainen, E. (2014). Exhaust duct flow noise simulation: A case study. In Proceedings of BNAM 2014 (pp. 554-560). [63]
Tanttari, Jukka ; Lehtinen, Antti ; Nousiainen, Esa. / Exhaust duct flow noise simulation : A case study. Proceedings of BNAM 2014. 2014. pp. 554-560
@inproceedings{078bde7f72c141f190b7ec04d044b826,
title = "Exhaust duct flow noise simulation: A case study",
abstract = "Exhaust noise is an important component in piston engine power plant environmental noise. It originates from engine as well as from turbulent gas flow in exhaust duct. Flow-related part has been less important but has caught more attention recently. A case study concerning noise of a part of a real exhaust duct was conducted. Simulations were done in several phases with increasing level of model capability and complexity. Steady state CFD provided information of the noise generation regions and levels. Transient CFD, resolving the turbulent structures, was then used to obtain more realistic information of the levels and frequency content. Finally, results from transient CFD were used as a FSP excitation for structural FE-model of the duct connected to exterior sound field. In-duct pressures estimated by transient CFD were in a very good agreement with experimental data from 50 to 500 Hz. It was also noticed that FSP excitation sets very strict demands on structural models because of potential spatial aliasing due to high wave-numbers involved. Correct description of both temporal as well as spatial characteristics of the excitation is essential for valid vibro-acoustic model.",
keywords = "aero-vibro-acoustics, duct acoustics, computational fluid dynamics",
author = "Jukka Tanttari and Antti Lehtinen and Esa Nousiainen",
note = "CA2: BA2151",
year = "2014",
language = "English",
isbn = "978-87-995400-1-3",
pages = "554--560",
booktitle = "Proceedings of BNAM 2014",

}

Tanttari, J, Lehtinen, A & Nousiainen, E 2014, Exhaust duct flow noise simulation: A case study. in Proceedings of BNAM 2014., 63, pp. 554-560, Baltic-Nordic Acoustic Meeting, BNAM 2014, Tallinn, Estonia, 2/06/14.

Exhaust duct flow noise simulation : A case study. / Tanttari, Jukka; Lehtinen, Antti; Nousiainen, Esa.

Proceedings of BNAM 2014. 2014. p. 554-560 63.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

TY - GEN

T1 - Exhaust duct flow noise simulation

T2 - A case study

AU - Tanttari, Jukka

AU - Lehtinen, Antti

AU - Nousiainen, Esa

N1 - CA2: BA2151

PY - 2014

Y1 - 2014

N2 - Exhaust noise is an important component in piston engine power plant environmental noise. It originates from engine as well as from turbulent gas flow in exhaust duct. Flow-related part has been less important but has caught more attention recently. A case study concerning noise of a part of a real exhaust duct was conducted. Simulations were done in several phases with increasing level of model capability and complexity. Steady state CFD provided information of the noise generation regions and levels. Transient CFD, resolving the turbulent structures, was then used to obtain more realistic information of the levels and frequency content. Finally, results from transient CFD were used as a FSP excitation for structural FE-model of the duct connected to exterior sound field. In-duct pressures estimated by transient CFD were in a very good agreement with experimental data from 50 to 500 Hz. It was also noticed that FSP excitation sets very strict demands on structural models because of potential spatial aliasing due to high wave-numbers involved. Correct description of both temporal as well as spatial characteristics of the excitation is essential for valid vibro-acoustic model.

AB - Exhaust noise is an important component in piston engine power plant environmental noise. It originates from engine as well as from turbulent gas flow in exhaust duct. Flow-related part has been less important but has caught more attention recently. A case study concerning noise of a part of a real exhaust duct was conducted. Simulations were done in several phases with increasing level of model capability and complexity. Steady state CFD provided information of the noise generation regions and levels. Transient CFD, resolving the turbulent structures, was then used to obtain more realistic information of the levels and frequency content. Finally, results from transient CFD were used as a FSP excitation for structural FE-model of the duct connected to exterior sound field. In-duct pressures estimated by transient CFD were in a very good agreement with experimental data from 50 to 500 Hz. It was also noticed that FSP excitation sets very strict demands on structural models because of potential spatial aliasing due to high wave-numbers involved. Correct description of both temporal as well as spatial characteristics of the excitation is essential for valid vibro-acoustic model.

KW - aero-vibro-acoustics

KW - duct acoustics

KW - computational fluid dynamics

UR - https://euracoustics.org/eaa-societies/partner-societies/nordic-acoustics-association/bnam2014-proceedings

M3 - Conference article in proceedings

SN - 978-87-995400-1-3

SP - 554

EP - 560

BT - Proceedings of BNAM 2014

ER -

Tanttari J, Lehtinen A, Nousiainen E. Exhaust duct flow noise simulation: A case study. In Proceedings of BNAM 2014. 2014. p. 554-560. 63