On predicting the sound from a cavitating marine propeller in a tunnel

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Model tests in a cavitation tunnel are commonly used in order to predict the radiated noise from full-scale marine propellers. Correction factors and scaling procedures are commonly used in estimating the effects of background noise and the propeller model scale. Less attention is paid to the influence of the tunnel related factors. Above a certain frequency, i.e. first non-plane wave mode cut-on frequency, the sound pressure varies over the tunnel cross-section and non-plane waves are introduced. Below this frequency, only plane waves propagate in the tunnel and no attenuation due to geometrical spreading occurs in the far field of the propeller. Thus, it is difficult to apply source level scaling procedures based on, e.g., spherical spreading of the sound field. Also, rigid tunnel walls near the propeller load it acoustically and may alter the fundamental sound emission compared to emission of the same source in free field conditions. In this paper, sound emission and immission of acoustic sources in a free space and in a waveguide are discussed and sound from a cavitating model-size marine propeller in a tunnel is investigated with numerical methods.
Original languageEnglish
Title of host publicationFifth International Symposium on Marine Propulsors
PublisherVTT Technical Research Centre of Finland
ISBN (Print)978-951-38-8608-0
Publication statusPublished - 2017
MoE publication typeA4 Article in a conference publication
EventFifth International Symposium on Marine Propulsors, smp'17 - Espoo, Finland
Duration: 12 Jun 201715 Jun 2017

Conference

ConferenceFifth International Symposium on Marine Propulsors, smp'17
Abbreviated titlesmp '17
CountryFinland
CityEspoo
Period12/06/1715/06/17

Fingerprint

propellers
tunnels
acoustics
scaling
scale models
background noise
sound fields
sound pressure
cavitation flow
far fields
plane waves
estimating
attenuation
waveguides
cross sections

Keywords

  • cavitation
  • marine propeller noise
  • acoustic analogy
  • hybrid method

Cite this

Hynninen, A., Tanttari, J., Viitanen, V., & Sipilä, T. (2017). On predicting the sound from a cavitating marine propeller in a tunnel. In Fifth International Symposium on Marine Propulsors VTT Technical Research Centre of Finland.
Hynninen, Antti ; Tanttari, Jukka ; Viitanen, Ville ; Sipilä, Tuomas. / On predicting the sound from a cavitating marine propeller in a tunnel. Fifth International Symposium on Marine Propulsors. VTT Technical Research Centre of Finland, 2017.
@inproceedings{6473a45dfd7f4ece975cef567e17f323,
title = "On predicting the sound from a cavitating marine propeller in a tunnel",
abstract = "Model tests in a cavitation tunnel are commonly used in order to predict the radiated noise from full-scale marine propellers. Correction factors and scaling procedures are commonly used in estimating the effects of background noise and the propeller model scale. Less attention is paid to the influence of the tunnel related factors. Above a certain frequency, i.e. first non-plane wave mode cut-on frequency, the sound pressure varies over the tunnel cross-section and non-plane waves are introduced. Below this frequency, only plane waves propagate in the tunnel and no attenuation due to geometrical spreading occurs in the far field of the propeller. Thus, it is difficult to apply source level scaling procedures based on, e.g., spherical spreading of the sound field. Also, rigid tunnel walls near the propeller load it acoustically and may alter the fundamental sound emission compared to emission of the same source in free field conditions. In this paper, sound emission and immission of acoustic sources in a free space and in a waveguide are discussed and sound from a cavitating model-size marine propeller in a tunnel is investigated with numerical methods.",
keywords = "cavitation, marine propeller noise, acoustic analogy, hybrid method",
author = "Antti Hynninen and Jukka Tanttari and Ville Viitanen and Tuomas Sipil{\"a}",
note = "Project code: 102340",
year = "2017",
language = "English",
isbn = "978-951-38-8608-0",
booktitle = "Fifth International Symposium on Marine Propulsors",
publisher = "VTT Technical Research Centre of Finland",
address = "Finland",

}

Hynninen, A, Tanttari, J, Viitanen, V & Sipilä, T 2017, On predicting the sound from a cavitating marine propeller in a tunnel. in Fifth International Symposium on Marine Propulsors. VTT Technical Research Centre of Finland, Fifth International Symposium on Marine Propulsors, smp'17, Espoo, Finland, 12/06/17.

On predicting the sound from a cavitating marine propeller in a tunnel. / Hynninen, Antti; Tanttari, Jukka; Viitanen, Ville; Sipilä, Tuomas.

Fifth International Symposium on Marine Propulsors. VTT Technical Research Centre of Finland, 2017.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - On predicting the sound from a cavitating marine propeller in a tunnel

AU - Hynninen, Antti

AU - Tanttari, Jukka

AU - Viitanen, Ville

AU - Sipilä, Tuomas

N1 - Project code: 102340

PY - 2017

Y1 - 2017

N2 - Model tests in a cavitation tunnel are commonly used in order to predict the radiated noise from full-scale marine propellers. Correction factors and scaling procedures are commonly used in estimating the effects of background noise and the propeller model scale. Less attention is paid to the influence of the tunnel related factors. Above a certain frequency, i.e. first non-plane wave mode cut-on frequency, the sound pressure varies over the tunnel cross-section and non-plane waves are introduced. Below this frequency, only plane waves propagate in the tunnel and no attenuation due to geometrical spreading occurs in the far field of the propeller. Thus, it is difficult to apply source level scaling procedures based on, e.g., spherical spreading of the sound field. Also, rigid tunnel walls near the propeller load it acoustically and may alter the fundamental sound emission compared to emission of the same source in free field conditions. In this paper, sound emission and immission of acoustic sources in a free space and in a waveguide are discussed and sound from a cavitating model-size marine propeller in a tunnel is investigated with numerical methods.

AB - Model tests in a cavitation tunnel are commonly used in order to predict the radiated noise from full-scale marine propellers. Correction factors and scaling procedures are commonly used in estimating the effects of background noise and the propeller model scale. Less attention is paid to the influence of the tunnel related factors. Above a certain frequency, i.e. first non-plane wave mode cut-on frequency, the sound pressure varies over the tunnel cross-section and non-plane waves are introduced. Below this frequency, only plane waves propagate in the tunnel and no attenuation due to geometrical spreading occurs in the far field of the propeller. Thus, it is difficult to apply source level scaling procedures based on, e.g., spherical spreading of the sound field. Also, rigid tunnel walls near the propeller load it acoustically and may alter the fundamental sound emission compared to emission of the same source in free field conditions. In this paper, sound emission and immission of acoustic sources in a free space and in a waveguide are discussed and sound from a cavitating model-size marine propeller in a tunnel is investigated with numerical methods.

KW - cavitation

KW - marine propeller noise

KW - acoustic analogy

KW - hybrid method

M3 - Conference article in proceedings

SN - 978-951-38-8608-0

BT - Fifth International Symposium on Marine Propulsors

PB - VTT Technical Research Centre of Finland

ER -

Hynninen A, Tanttari J, Viitanen V, Sipilä T. On predicting the sound from a cavitating marine propeller in a tunnel. In Fifth International Symposium on Marine Propulsors. VTT Technical Research Centre of Finland. 2017