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

Young J. Moon; Yong Cho; Hyun Sik Nam

doi:10.1016/S0045-7930(02)00068-3

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

Young J. Moon^*
, Yong Cho
, Hyun Sik Nam

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

85 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 language	English
Pages (from-to)	995-1015
Number of pages	21
Journal	Computers and Fluids
Volume	32
Issue number	7
DOIs	https://doi.org/10.1016/S0045-7930(02)00068-3
Publication status	Published - 2003 Aug

Bibliographical note

Funding Information:
The authors wish to thank Mr. Jin, Sim-Won of the LG Digital Appliance Laboratory for providing the fan performance data. This work was partially supported by the LG Digital Appliance Laboratory, the Korea Research Foundation (97-005-E00199), and the Korea Science and Engineering Foundation (1999-02-3) through the Regional Research Center for Advanced Climate Control Technology at the SunMoon University.

Copyright:
Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.

Keywords

Aeroacoustic noise
Cross flow fan
Unsteady viscous flow

ASJC Scopus subject areas

General Computer Science
General Engineering

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10.1016/S0045-7930(02)00068-3

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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 J.\} and Yong Cho and Nam, \{Hyun Sik\}",

note = "Funding Information: The authors wish to thank Mr. Jin, Sim-Won of the LG Digital Appliance Laboratory for providing the fan performance data. This work was partially supported by the LG Digital Appliance Laboratory, the Korea Research Foundation (97-005-E00199), and the Korea Science and Engineering Foundation (1999-02-3) through the Regional Research Center for Advanced Climate Control Technology at the SunMoon University. Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.",

year = "2003",

month = aug,

doi = "10.1016/S0045-7930(02)00068-3",

language = "English",

volume = "32",

pages = "995--1015",

journal = "Computers and Fluids",

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AU - Moon, Young J.

AU - Cho, Yong

AU - Nam, Hyun Sik

N1 - Funding Information: The authors wish to thank Mr. Jin, Sim-Won of the LG Digital Appliance Laboratory for providing the fan performance data. This work was partially supported by the LG Digital Appliance Laboratory, the Korea Research Foundation (97-005-E00199), and the Korea Science and Engineering Foundation (1999-02-3) through the Regional Research Center for Advanced Climate Control Technology at the SunMoon University. Copyright: Copyright 2004 Elsevier Science B.V., Amsterdam. All rights reserved.

PY - 2003/8

Y1 - 2003/8

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

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

M3 - Article

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SN - 0045-7930

VL - 32

SP - 995

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JO - Computers and Fluids

JF - Computers and Fluids

IS - 7

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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