TY - GEN A1 - Geyer, Thomas A1 - Moreau, Danielle J. A1 - Zhang, Tingyi A1 - Schneehagen, Erik W. A1 - Ding, Yuchen T1 - Experimental investigation of novel, low-noise turbine blade tip designs T2 - Fortschritte der Akustik - DAGA, 46. Jahrestagung für Akustik, 16.-19. März 2020 in Hannover Y1 - 2020 UR - https://www-docs.b-tu.de/fg-akustik/public/veroeffentlichungen/geyer_noveltip_daga2020.pdf ER - TY - GEN A1 - Ding, Yuchen A1 - Zhang, Tingyi A1 - Geyer, Thomas A1 - Silva, Charitha de A1 - Doolan, Con A1 - Moreau, Danielle J. T1 - Experimental Investigation of the Flow Characteristics and Noise Generation at the Wing–Wall Junction T2 - Journal of Aerospace Engineering Y1 - 2021 UR - https://ascelibrary.org/doi/abs/10.1061/%28ASCE%29AS.1943-5525.0001303 U6 - https://doi.org/10.1061/(ASCE)AS.1943-5525.0001303 VL - 34 IS - 5 ER - TY - GEN A1 - Zhang, Tingyi A1 - Geyer, Thomas A1 - Silva, Charitha de A1 - Fischer, Jeoffrey A1 - Doolan, Con A1 - Moreau, Danielle J. T1 - Experimental Investigation of Tip Vortex Formation Noise Produced by Wall-Mounted Finite Airfoils T2 - Journal of Aerospace Engineering Y1 - 2021 UR - https://ascelibrary.org/doi/10.1061/%28ASCE%29AS.1943-5525.0001315 U6 - https://doi.org/10.1061/(ASCE)AS.1943-5525.0001315 SN - 1943-5525 VL - 34 IS - 6 ER - TY - GEN A1 - Zhang, Tingyi A1 - Moreau, Danielle J. A1 - Geyer, Thomas A1 - Fischer, Jeoffrey A1 - Doolan, Con T1 - Dataset on tip vortex formation noise produced by wall-mounted finite airfoils with sinusoidal and porous tip geometries T2 - Data in Brief Y1 - 2020 U6 - https://doi.org/10.1016/j.dib.2020.105471 SN - 2352-3409 VL - 30 ER - TY - GEN A1 - Zhang, Tingyi A1 - Moreau, Danielle J. A1 - Geyer, Thomas A1 - Fischer, Jeoffrey A1 - Doolan, Con T1 - Dataset on tip vortex formation noise produced by wall-mounted finite airfoils with flat and rounded tip geometries T2 - Data in Brief Y1 - 2020 U6 - https://doi.org/10.1016/j.dib.2019.105058 SN - 2352-3409 VL - 28 ER - TY - GEN A1 - Geyer, Thomas A1 - Schneehagen, Erik W. A1 - Herold, Gert A1 - Zhang, Tingyi A1 - Moreau, Danielle J. T1 - Reduction of rotor aerodynamic noise using porous blade tips T2 - Fortschritte der Akustik - DAGA, 50. Jahrestagung für Akustik N2 - Motivated by promising results from experiments on the noise reduction performance of finite wall-mounted airfoils with a porous tip in an aeroacoustic wind tunnel, corresponding measurements were performed in a dedicated rotor test rig. This rig features a 3 kW direct-drive electric motor with three rotor blades of 1.1 m diameter. In the experiments, a variety of different tip modifications was tested regarding their noise reducing performance, including different porous materials that were manufactured using rapid prototyping. Acoustic measurements were performed at different rotationals speeds and blade angles using a ring-shaped microphone array consisting of 60 evenly spaced microphones. The rotational speed was measured using a laser sensor. Different beamforming algorithms were used in post-processing to help analyzing the data. The results show that porous tips can lead to a notable noise reduction at low frequencies, but a small penalty at medium and high frequencies which may be due to the surface roughness of the porous tips. This trend seems more severe for lower blade angles than for higher ones. These findings agree well with those obtained from the previous wind tunnel measurements. Y1 - 2024 UR - https://pub.dega-akustik.de/DAGA_2024/konferenz?article=471 ER -