Aeroacoustic Interactions of a Trailing Edge Mounted Propeller and Flat Plate

Hanson, Liam P.; Baskaran, Kabilan; Zang, Bin; Azarpeyvand, Mahdi

doi:10.2514/6.2022-2937

Cited by 10 publications

(2 citation statements)

References 28 publications

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“…Aerodynamic loads were measured by a 6-component ATI mini40 multi axis load cell fitted directly behind the motor; giving an isolated load path. The test rig used in this study has been previously utilised in previous experiments which can offer further information on the test rig and setup [17][18][19][20][21][22].…”

Section: Experimental Set-upmentioning

confidence: 99%

Numerical and experimental investigation of propeller noise with trailing-edge serrations

Zang,

Hanson,

Stoltz

et al. 2023

AIAA AVIATION 2023 Forum

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The present study examines the effect of trailing-edge serrations on propeller noise at both hover and forward flight conditions. Three different serrations were designed with wavelengthto-amplitude ratios from 0.6 to 1.2, based on the several recent literature. Both experimental measurement and numerical simulations were carried out to first quantify the far-field noise spectra and subsequently, to provide flow field analyses, which can shed some lights on the physical mechanisms leading to the noise reduction at different operating conditions. The results show that the present unsteady RANS simulation predicts the far-field acoustics of both the baseline and serrated propellers, which agree relatively well with the experimental measurements at hover conditions. However, due to limited simulation time, the blade pass frequencies and its harmonics are not well captured. Moreover, the use of trailing-edge serrations on propellers lead to clear reduction of the far-field noise levels, and the effectiveness of the noise reduction is dependent on the key parameters defining the serrations as well as the propeller operating condition. With the serrations, the turbulent kinetic energy over the entire blade reduces, particularly close to the trailing-edge regions and the iso-surface contours reveal that the turbulent structures become less coherent in the blade spanwise direction. Subsequently, these turbulent structures are observed to decay more rapidly than the baseline configuration in the near-wake region. These modifications to the turbulent structures on the blade as well as in the near-wake possibly contributes the reduction of far-field noise by applying trailing-edge serrations to the propellers.

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Section: Experimental Set-upmentioning

confidence: 99%

Numerical and experimental investigation of propeller noise with trailing-edge serrations

Zang,

Hanson,

Stoltz

et al. 2023

AIAA AVIATION 2023 Forum

Self Cite

View full text Add to dashboard Cite

show abstract

“…Propeller noise has been investigated in various recent studies over a wide range of operating conditions and configurations [7][8][9][10][11]. Grande et al [12] tested a propeller at a range of free-stream velocities and advance ratios, they found far-field noise spectra to present discrete tones occurring at multiples of the blade passing frequency (BPF) with significant broadband noise resulting from turbulent boundary-layer trailing-edge noise and turbulence ingestion noise.…”

Section: Introductionmentioning

confidence: 99%