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Design and Construction of a Silent Wind Tunnel for

Aeroacoustic Research

Roberto Putzu, Davide Greco, David Craquelin, Fabien Crisinel

hepia - University of Applied Sciences of Western Switzerland, Switzerland

Keywords: aeroacoustics, silent wind tunnel, anechoic room

Abstract

The anechoic chamber of “hepia - Gen`eve” was

modiﬁed with the purpouse to host a removable

wind tunnel for aeroacoustic research. This pa-

per describes in detail the design and construc-

tion of this small scale, low Mach number, silent

wind tunnel. Special attention is given to a

detailed description of the technical challanges

faced.

1 Introduction

Due to the growing interest in aeroacoustics

from the side of “hepia - Gen`eve” (Haute ´ecole

du Paysage d’Ing´enierie et d’Architecture de

Gen`eve - hereafter hepia), its pre-exi st i n g ane-

ch oi c chamber was modiﬁed in order to host a

wind tunnel which can be used for aeroacous-

tic research. The anechoic chamber, still having

to be used for classical acoustic measurements,

could not host a permanent facility. A choice has

been made to design and construct a removab l e

wind tunnel inside the anechoic chamber.

2 Scope of the work

This paper presents the design and the con-

struction of a small-scale, low Mach number

and silent wind tunnel for aeroacoustic research.

The presented work was realized in the anechoic

ch amb er of hepia. The technic al challenge of

this project rises due to the fact t h at any new

installation in the anechoic chambe r shoul d not

Figure 1: Schematic drawing of the hepia ane-

ch oi ch chamber.

prevent its further use for purely acoustical mea-

surements. This led to the choice of a silent wind

tunnel that does not introduce relevant struc-

tural modiﬁcations to the anechoic chamber and

that can be easily removab le .

The silent wind tunnel te st section is an open

test section where ﬂow is provided by an hor-

izontal squar e jet. The open jet test section

is particularly suitable for acoustic testing be-

cause the surrounding plenum chamber can be

equipped with acoustc linings [2]. In fact, the

test section is positioned inside the anechoic

ch amb er , so that aeroacoustic experiments can

be performed with a ver y low background noise

1 2 3 4 5 6 7

Aeroacoustic Research 1

Résumé du contenu

Page 1 - Aeroacoustic Research

Design and Construction of a Silent Wind Tunnel forAeroacoustic ResearchRoberto Putzu, Davide Greco, David Craquelin, Fabien Crisinelhepia - Universit

Page 2

R. Putzu, D. Greco, D. C raqu e li n, F. CrisinelFigure 2: Internal pictures of the hepia anechoic chamber. The left ﬁgure shows the empty chamber.The

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Design and Construction of a Si le nt Wind Tunnel for Aeroacoustic Researchthe anechoic room, we found that a suitable con-ﬁguration is to have a squa

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R. Putzu, D. Greco, D. C raqu e li n, F. CrisinelSound Power Level 125 250 500 1k 2k 4k 8kLW,F an(@ max speed) 78.1 82.6 78.2 75 72.8 69 62.1 Given by

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Design and Construction of a Si le nt Wind Tunnel for Aeroacoustic ResearchFigure 6: Conver ge nt muﬄer’s schematic drawing, units are in mm.6.1 The F

Page 6

R. Putzu, D. Greco, D. C raqu e li n, F. CrisinelFigure 7: Second elbow section’s schematicdrawing, units are in mm.6.5 The settling ch amb erDownstre

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Design and Construction of a Si le nt Wind Tunnel for Aeroacoustic ResearchFigure 9: Wind tunnel nozzle.tion.7 ConclusionsAfter the design of the wind

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