111th NIA CFD Seminar: Numerical investigation of noise sources and noise mitigation strategies for Ultra High Bypass Ratio engines

Date: Thursday, April 11, 2019

Time: 11am-noon (EDT)

Room: NIA, Rm137

Speaker: Francesco Avallone 

Link: http://nia-mediasite.nianet.org/NIAMediasite100/Catalog/Full/c40f721b665a4091b7d8bcb6a128fdbd21

Abstract: The development of Ultra High Bypass Ratio (UHBR) engines, to reduce both fuel consumption and noise pollution, is creating new challenges for the aeroacoustics community. UHBR are characterized by larger fan diameter, lower rotational speed of the fan and lower jet core velocity. Consequence is that jet noise is decreasing while other sources of noise, such as jet installation noise and rotor/stator interaction noise, become dominant. At the same time, well-established noise mitigation technologies such as acoustic liners are challenged to accommodate the lower rotational velocity of the fan. In this talk, an overview of the Computational Aeroacoustics research in this field carried out at TU Delft, aiming at identifying the physical mechanisms and developing physics-based noise reduction strategies, will be presented.

Speaker Bio: Francesco Avallone is Assistant Professor at the AWEP Department, Wind Energy Section, at Delft University of Technology. He received both his MSc and PhD degrees from the University of Naples Federico II. His PhD focused on non-intrusive techniques for boundary layer transition in hypersonic flows. In 2015, he joined Delft University of Technology as PostDoc in Aeroacoustics. During this period, he worked on turbulent boundary layer trailing edge noise mitigation with innovative trailing edge serrations. Since July 2017, he is Assistant Professor. His research interests are airfoil self-noise, acoustic liners and jet installation noise. For his research he uses both experimental and computational techniques.