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AOE Seminar July 2, 2018: Effects of inclined transverse jets on trailing edge noise generation

  • July 2, 2018
  • 3:30 p.m.
  • 655 McBryde Hall
  • Matt Szoke, University of Bristol
  • Faculty Host: Dr. William Devenport

Abstract: The current work is an experimental investigation on the use of open-loop flow control techniques to reduce trailing edge noise of a flat plate. An array of inclined transverse jet nozzles is placed upstream of the trailing edge, with the aim of controlling the hydrodynamic pressure field associated with the boundary layer. The turbulence statistics downstream of the flow control section were measured with the use of hot-wire anemometry, while the simultaneous measurement of the surface pressure fluctuations was performed with flush mounted microphones. It is shown that the proposed flow control method leads to a reduction of the energy content of the surface pressure fluctuations in the region of low and mid frequencies. The spanwise correlation length of the turbulent structures near the trailing edge is also observed to decrease as a  consequence of using multiple jet injections. In general, results have shown that the proposed flow control technique can alter the boundary layer structure, and it has the potentials to reduce far-field trailing edge noise.

Bio: Matt Szoke is a final year PhD student at the University of Bristol, under the supervision of Dr Mahdi Azarpeyvand. His research aim is to develop active flow control methods for the reduction of trailing edge noise. Thanks to research collaborations within Dr Azarpeyvand's group, Matt became familiar with additional topics of aeroacoustics, such as effects of riblet-like surface treatments on trailing edge noise, and porous materials on blunt trailing edge noise. In 2015, Matt took part in a 6-month project at University of Bristol in association with Aircraft Research Association Ltd. as a research assistant, where he developed an 80 and a 36 elements beamforming array for the measurement of helicopter noise.  

Matt received his undergraduate degree in Mechanical Engineering at Budapest University of Technology and Economics (BUTE). Matt holds two MSc degrees, one in Mechanical Engineering Modelling from BUTE, and one in Computational Fluid Dynamics from Cranfield University.  At BUTE, Matt conducted experiments and created a numerical model to capture non-linearities of a pneumatic cylinder, which is a coupled fluid mechanical (pneumatics) and solid mechanical (cylinder) system. At Cranfield, he implemented a two-dimensional lattice Boltzmann solver in a novel parallel programming technique called PGAS, which is a high performance computing model combining OpenMP-like shared and MPI-like distributed memory approaches.