Phased array microphone measurement of a ducted low-speed axial flow fan at various operating points with the involvement of the acoustically transparent duct technique
Restricted accessResearch articleFirst published online November, 2023
Phased array microphone measurement of a ducted low-speed axial flow fan at various operating points with the involvement of the acoustically transparent duct technique
The aeroacoustic investigation of ducted turbomachines is not evident. Wall-mounted and strut-mounted microphones placed in the flow field are both sensitive to installation, placement, and flow-related effects. Therefore, it is advantageous to place the microphone sensors outside of the ducting of the turbomachine while also accounting for the acoustic characteristic of the ducting. In this paper, a ducted low-speed axial flow fan is investigated with the acoustically transparent duct (ATD) and the phased array microphone (PAM) Rotating Source Identification (ROSI) beamforming techniques at design and off-design conditions. The combination of these methods is capable of identifying the dominant sound sources of the fan in a non-intrusive approach at stall condition, pre-stall operation, design condition, and part-load operating condition as well.
StephensDBMorrisSC. Measurements and modeling of the self noise of a low-speed ducted rotor. Int J Aeroacoust2011; 10(5–6): 613–633. DOI: 10.1260/1475-472X.10.5-6.613.
2.
FullerCR. Self active cancellation of fan noise. Int J Aeroacoust2022; 21(5–7): 430–437. DOI: 10.1177/1475472X221107543.
3.
ZhuTCarolusTH. Axial fan tip clearance noise: experiments, lattice–boltzmann simulation, and mitigation measures. Int J Aeroacoust2018; 17(1–2): 159–183. DOI: 10.1177/1475472X17743627.
4.
OsborneWC. Fans. 1st ed.Oxford, United Kingdom: Pergamon Press Ltd, 1966.
BrooksTFPopeDSMarcoliniMA. Airfoil self-noise and prediction [Tech. Rep.]. NASA Reference Publication 1218, NASA Langley Research Center, 1989
7.
De GennaroMKuehneltH.Broadband noise modelling and prediction for axial fans. In: FAN 2012, Senlis, France, 18–20 April 2012.
8.
HeroldGZengerFSarradjE. Influence of blade skew on axial fan component noise. Int J Aeroacoust2017; 16(4–5): 418–430. DOI: 10.1177/1475472X17718740.
9.
ZengerFJHeroldGBeckerS, et al.Sound source localization on an axial fan at different operating points. Exp Fluids2016; 57: 136. DOI: 10.1007/s00348-016-2223-8.
10.
FukanoTJangCM. Tip clearance noise of axial flow fans operating at design and off-design condition. J Sound Vib2004; 275(3): 1027–1050. DOI: 10.1016/S0022-460X(03)00815-0.
11.
LonghouseR. Control of tip-vortex noise of axial flow fans by rotating shrouds. J Sound Vib1978; 58(2): 201–214. DOI: 10.1016/S0022-460X(78)80075-3.
12.
LuoBChuWZhangH. Tip leakage flow and aeroacoustics analysis of a lowspeed axial fan. Aerosp Sci Technol2020; 98: 105700. DOI: 10.1016/j.ast.2020.105700105700.
13.
JangCMSatoDFukanoT. Experimental analysis on tip leakage and wake flow in an axial flow fan according to flow rates. J Fluids Eng2005; 127(2): 322–329. DOI: 10.1115/1.1881695.
14.
BenedekTVadJLendvaiB. Combined acoustic and aerodynamic investigation of the effect of inlet geometry on tip leakage flow noise of free-inlet free-exhaust low-speed axial flow fans. Appl Acoust2022; 187: 108488. ISSN 0003-682X. DOI: 10.1016/j.apacoust.2021.108488.
15.
KhalidSAKhalsaASWaitzIA, et al.Endwall blockage in axial compressors. J Turbomach1999; 121(3): 499–509. DOI: 10.1115/1.2841344.
16.
HahC. Effects of double-leakage tip clearance flow on the performance of a compressor stage with a large rotor tip gap. J Turbomach2017; 139: 061006.
17.
TokajiKHorváthC. Effect of a pylon on the broadband noise sources of counter-rotating turbomachinery. Int J Aeroacoust2021; 20(8): 979–1002. DOI: 10.1177/1475472X211055178.
18.
SijtsmaP. Using phased array beamforming to identify broadband noise sources in a Turbofan engine. Int J Aeroacoust2010; 9(3): 357–374. DOI: 10.1260/1475-472X.9.3.357.
19.
SijtsmaPOerlemensSHolthusenH. Location of rotating sources by phased array measurements[Tech. Rep.]. NLR-TP-2001-135, NLR, Maastricht, Netherlands, 2001
20.
DoughertyRPWalkerBE. Virtual rotating microphone imaging of broadband fan noise. In: 15th AIAA/CEAS aeroacoustics conference (30th AIAA aeroacoustics conference), Miami, Florida, 11–13 May 2009. DOI: 10.2514/6.2009-3121
21.
BenedekTVadJ. An industrial onsite methodology for combined acoustic-aerodynamic diagnostics of axial fans, involving the phased array microphone technique. Int J Aeroacoust2016; 15(1–2): 81–102. DOI: 10.1177/1475472X16630849.
22.
XuKShiYQiaoW, et al.The methodological and experimental research on the identification and localization of turbomachinery rotating sound source. Energies2022; 15: 8647. DOI: 10.3390/en15228647.
23.
KlähnLMoreauACaldasL, et al.Advanced analysis of fan noise measurements supported by theoretical source models. Int J Aeroacoust2022; 21(3–4): 239–259. DOI: 10.1177/1475472X221093703.
TokajiKHorváthCSzekerB. Comparison of multiple fan system assemblies using an acoustically transparent duct. In: FAN 2018 international conference of fan noise, aerodynamics, applications and systems, Darmstadt, Germany, 18–20 April 2018
27.
LendvaiBBenedekT. Study on the effect of sudden duct diameter change on the performance of an axial flow fan. In: Conference on modelling fluid flows (CMFF'22), Budapest, Hungary, 30 August–02 September 2022.
