Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans

Young June Moon, Yong Cho, Hyun Sik Nam

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Time-accurate viscous flow solutions are sought for the prediction of unsteady flow characteristics and associated aeroacoustic blade tonal noise of a cross flow fan. The two-dimensional incompressible Navier-Stokes equations in a moving coordinate are time-accurately solved by an unstructured finite-volume method on triangular meshes, and a sliding mesh technique is utilized at the interface between the domain rotating with blades and the stationary one for allowing the unsteady interactions. An accuracy assessment of the present method is made by comparing the fan performances with experimental data for a rotational speed at 1000 rpm and the Reynolds number 5300 based on blade tip speed and chord length. With the computed unsteady viscous flow solutions, sound pressure is predicted using Curle's equation and narrow-band noise characteristics of three impellers with a uniform and two random pitch (type-A and -B) blades are compared by their sound pressure level spectra. Also, the frequency modulations of the blade passing frequency noise by random pitch fans are discussed.

Original languageEnglish
Pages (from-to)995-1015
Number of pages21
JournalComputers and Fluids
Volume32
Issue number7
DOIs
Publication statusPublished - 2003 Aug 1

Fingerprint

Aeroacoustics
Viscous flow
Acoustic noise
Fans
Acoustic waves
Impellers
Finite volume method
Frequency modulation
Unsteady flow
Navier Stokes equations
Reynolds number

Keywords

  • Aeroacoustic noise
  • Cross flow fan
  • Unsteady viscous flow

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanical Engineering

Cite this

Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans. / Moon, Young June; Cho, Yong; Nam, Hyun Sik.

In: Computers and Fluids, Vol. 32, No. 7, 01.08.2003, p. 995-1015.

Research output: Contribution to journalArticle

Moon, Young June ; Cho, Yong ; Nam, Hyun Sik. / Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans. In: Computers and Fluids. 2003 ; Vol. 32, No. 7. pp. 995-1015.
@article{c69ea95a5470421e8075f3c93ec0adb4,
title = "Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans",
abstract = "Time-accurate viscous flow solutions are sought for the prediction of unsteady flow characteristics and associated aeroacoustic blade tonal noise of a cross flow fan. The two-dimensional incompressible Navier-Stokes equations in a moving coordinate are time-accurately solved by an unstructured finite-volume method on triangular meshes, and a sliding mesh technique is utilized at the interface between the domain rotating with blades and the stationary one for allowing the unsteady interactions. An accuracy assessment of the present method is made by comparing the fan performances with experimental data for a rotational speed at 1000 rpm and the Reynolds number 5300 based on blade tip speed and chord length. With the computed unsteady viscous flow solutions, sound pressure is predicted using Curle's equation and narrow-band noise characteristics of three impellers with a uniform and two random pitch (type-A and -B) blades are compared by their sound pressure level spectra. Also, the frequency modulations of the blade passing frequency noise by random pitch fans are discussed.",
keywords = "Aeroacoustic noise, Cross flow fan, Unsteady viscous flow",
author = "Moon, {Young June} and Yong Cho and Nam, {Hyun Sik}",
year = "2003",
month = "8",
day = "1",
doi = "10.1016/S0045-7930(02)00068-3",
language = "English",
volume = "32",
pages = "995--1015",
journal = "Computers and Fluids",
issn = "0045-7930",
publisher = "Elsevier Limited",
number = "7",

}

TY - JOUR

T1 - Computation of unsteady viscous flow and aeroacoustic noise of cross flow fans

AU - Moon, Young June

AU - Cho, Yong

AU - Nam, Hyun Sik

PY - 2003/8/1

Y1 - 2003/8/1

N2 - Time-accurate viscous flow solutions are sought for the prediction of unsteady flow characteristics and associated aeroacoustic blade tonal noise of a cross flow fan. The two-dimensional incompressible Navier-Stokes equations in a moving coordinate are time-accurately solved by an unstructured finite-volume method on triangular meshes, and a sliding mesh technique is utilized at the interface between the domain rotating with blades and the stationary one for allowing the unsteady interactions. An accuracy assessment of the present method is made by comparing the fan performances with experimental data for a rotational speed at 1000 rpm and the Reynolds number 5300 based on blade tip speed and chord length. With the computed unsteady viscous flow solutions, sound pressure is predicted using Curle's equation and narrow-band noise characteristics of three impellers with a uniform and two random pitch (type-A and -B) blades are compared by their sound pressure level spectra. Also, the frequency modulations of the blade passing frequency noise by random pitch fans are discussed.

AB - Time-accurate viscous flow solutions are sought for the prediction of unsteady flow characteristics and associated aeroacoustic blade tonal noise of a cross flow fan. The two-dimensional incompressible Navier-Stokes equations in a moving coordinate are time-accurately solved by an unstructured finite-volume method on triangular meshes, and a sliding mesh technique is utilized at the interface between the domain rotating with blades and the stationary one for allowing the unsteady interactions. An accuracy assessment of the present method is made by comparing the fan performances with experimental data for a rotational speed at 1000 rpm and the Reynolds number 5300 based on blade tip speed and chord length. With the computed unsteady viscous flow solutions, sound pressure is predicted using Curle's equation and narrow-band noise characteristics of three impellers with a uniform and two random pitch (type-A and -B) blades are compared by their sound pressure level spectra. Also, the frequency modulations of the blade passing frequency noise by random pitch fans are discussed.

KW - Aeroacoustic noise

KW - Cross flow fan

KW - Unsteady viscous flow

UR - http://www.scopus.com/inward/record.url?scp=0037411941&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0037411941&partnerID=8YFLogxK

U2 - 10.1016/S0045-7930(02)00068-3

DO - 10.1016/S0045-7930(02)00068-3

M3 - Article

AN - SCOPUS:0037411941

VL - 32

SP - 995

EP - 1015

JO - Computers and Fluids

JF - Computers and Fluids

SN - 0045-7930

IS - 7

ER -