PMID- 37002080
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20230403
LR  - 20230403
IS  - 1520-8524 (Electronic)
IS  - 0001-4966 (Linking)
VI  - 153
IP  - 3
DP  - 2023 Mar
TI  - Inflow turbulence distortion for airfoil leading-edge noise prediction for large 
      turbulence length scales for zero-mean loading.
PG  - 1811
LID - 10.1121/10.0017458 [doi]
AB  - Turbulence distortion due to airfoil finite thickness is an important but not 
      fully understood phenomenon that affects the airfoil radiated noise, resulting in 
      inaccurate noise predictions. This study discusses the turbulence distortion in 
      the leading edge (LE) region of an airfoil aiming to obtain more accurate LE 
      noise predictions. Wind tunnel experiments were performed for National Advisory 
      Committee for Aeronautics (NACA) 0008 and NACA 0012 airfoils at zero angle of 
      attack subjected to large turbulence length scales (between 10 and 43 times the 
      airfoil LE radius) generated by a grid and a rod. Hot-wire and surface pressure 
      measurements were performed in the LE region. Results show that the root mean 
      square of the velocity fluctuations u(rms) and the turbulence integral length 
      scale Lambda(f) at the stagnation line decrease considerably as the LE is approached. 
      Rod-airfoil radiated noise was measured and compared with Amiet's model. The 
      predicted noise overestimates the LE noise for high frequencies. However, the 
      prediction agrees well with measurements when the turbulence spectrum based on 
      the rapid distortion theory is used in Amiet's model, with as inputs the u(rms) 
      and Lambda(f) values measured close to the LE. This work's main contribution is to 
      demonstrate that more accurate noise predictions are obtained when the inputs to 
      the model consider the turbulence distortion effects.
FAU - Dos Santos, Fernanda L
AU  - Dos Santos FL
AUID- ORCID: 0000-0001-8216-185X
AD  - Department of Thermal Fluid Engineering, University of Twente, Enschede, 7522 NB, 
      The Netherlands.
FAU - Botero-Bolivar, Laura
AU  - Botero-Bolivar L
AUID- ORCID: 0000-0002-9824-1173
AD  - Department of Thermal Fluid Engineering, University of Twente, Enschede, 7522 NB, 
      The Netherlands.
FAU - Venner, Cornelis H
AU  - Venner CH
AUID- ORCID: 0000-0002-0647-9249
AD  - Department of Thermal Fluid Engineering, University of Twente, Enschede, 7522 NB, 
      The Netherlands.
FAU - de Santana, Leandro D
AU  - de Santana LD
AUID- ORCID: 0000-0003-3235-544X
AD  - Department of Thermal Fluid Engineering, University of Twente, Enschede, 7522 NB, 
      The Netherlands.
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Acoust Soc Am
JT  - The Journal of the Acoustical Society of America
JID - 7503051
SB  - IM
EDAT- 2023/04/01 06:00
MHDA- 2023/04/01 06:01
CRDT- 2023/03/31 22:04
PHST- 2023/04/01 06:01 [medline]
PHST- 2023/03/31 22:04 [entrez]
PHST- 2023/04/01 06:00 [pubmed]
AID - 10.1121/10.0017458 [doi]
PST - ppublish
SO  - J Acoust Soc Am. 2023 Mar;153(3):1811. doi: 10.1121/10.0017458.