On the reduction of the noise in a low-pressure turbine cascade associated with the wavy leading edge

Han, Jieting; Zhang, Yu; Li, Shiyang; Hong, Weirong; Wu, Dazhuan

doi:10.1063/5.0165080

Cited by 7 publications

(1 citation statement)

References 49 publications

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“…A large eddy simulation was performed by Han et al [15] to investigate the feasibility and mechanism of wavy leading-edge noise control in a low-pressure turbine cascade model. They pointed out that the maximum noise reduction that can achieved is 8.6 dB and 3.7 dB in the frequency bands of 315~4000 Hz and 6300~16,000 Hz, respectively.…”

Section: Introductionmentioning

confidence: 99%

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Gao,

Chen,

Tong

et al. 2024

Aerospace

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In this paper, a numerical investigation is performed to study the broadband noise of a fan stage with wavy trailing-edge blades. A study of the wavelength and ratio of amplitude to wavelength (H/L) is conducted to better understand the noise reduction effect of wavy trailing-edge blades. A rotor–stator interaction broadband noise prediction method based on the result of a Reynolds-averaged Navier–Stokes equation is used. The results show that all wavy trailing-edge configurations reduce the sound power level of the fan stage. The noise reduction effect of H20L10 is the best among all the wavy trailing-edge configurations, and the sound power level is reduced by 2.4 dB at 1000 Hz. When the H/L remains unchanged, the noise reduction effect of the wavy trailing-edge configuration increases with the increase in wavelength. When the wavelength remains unchanged, the noise reduction effect of the wavy trailing-edge configuration with an H/L of 2 is the best. The use of wavy trailing-edge configurations reduces the turbulent kinetic energy and turbulent integral length scale upstream of the stator by changing the wake of the rotor, thereby reducing the rotor–stator interaction broadband noise of the fan stage.

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Section: Introductionmentioning

confidence: 99%

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Gao,

Chen,

Tong

et al. 2024

Aerospace

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LES investigation of the wavy leading edge effect on cavitation noise

Yang,

Wang,

Zhao

et al. 2024

Ultrasonics Sonochemistry

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Numerical study of inflow turbulence distortion and noise for airfoils

Ribeiro,

dos Santos,

Venner

et al. 2023

Physics of Fluids

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In this work, the interaction of grid-generated turbulence with airfoils of different thicknesses, namely, a National Advisory Committee for Aeronautics (NACA) 0008 and a NACA 0018, is investigated, leading to a deeper understanding of the influence of the airfoil geometry on the near-field flow and on the far-field pressure fluctuations. Experimentally validated lattice-Boltzmann simulations are used to analyze the flow properties in the leading-edge (LE) vicinity. The analysis of the velocity fluctuations near the LE shows that momentum is transferred from the streamwise to the transverse velocity for the NACA 0008 airfoil interacting with a large turbulence length scale. This mechanism changes with the increase in the airfoil thickness because the inflow turbulence length scale becomes comparable to the airfoil thickness in the LE region, resulting in a higher concentration of vortices near the LE oriented in the transverse direction, creating high-velocity fluctuations in the spanwise direction. The near- and far-field pressure fluctuations are analyzed to understand the impact of the inflow turbulence distortion on these parameters and the limitations of analytical methods for real airfoils. Results show that the wall-pressure fluctuations are affected by the turbulence distortion in the LE region. Thick airfoils have noise directivity patterns significantly different compared to the Amiet predictions for higher frequencies, radiating higher noise levels upstream of the LE than the thin airfoil. This is likely associated with a drastic change in the pressure fluctuation distribution near the airfoil LE region, attributed to the change in the distortion of the vortical structures in the LE area.

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On the reduction of the noise in a low-pressure turbine cascade associated with the wavy leading edge

Cited by 7 publications

References 49 publications

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

Broadband Noise Reduction of a Two-Stage Fan with Wavy Trailing-Edge Blades

LES investigation of the wavy leading edge effect on cavitation noise

Numerical study of inflow turbulence distortion and noise for airfoils

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