Development of scaling methods for broadband turbulent noise in internal flow devices by means of experiments and CFD

Development of scaling methods for broadband turbulent noise in internal flow devices by means of experiments and CFD

De Jong, B.A.

Boersma, B.J. (mentor)

Mechanical, Maritime and Materials Engineering

Process and Energy

Solid and Fluid Mechanics

2016-02-11

Broadband turbulent noise can lead to fluid-acoustic and fluid-structure interaction and ultimately to mechanical failure of pipe systems. In HVAC (Heating Ventilating and Air Conditioning) systems broadband turbulent noise can radiate outwards where it is a nuisance or even harmful to people. A fast and simple approach for investigating broadband noise is the scaling law approach originally derived by (Nelson & Morfey, 1981) based on pressure drop. Recently this approach is improved by (de Jong & Golliard, 2013) using steady Reynolds Averaged Navier Stokes (RANS) simulations but was only validated using benchmark geometries. In this work experiments are performed on several DIN standard bends as well as on an orifice. Their sound power spectra are successfully scaled. Furthermore the scaling law by (de Jong & Golliard, 2013) is improved by implementing an automated length scale selection.

broadband noise

http://resolver.tudelft.nl/uuid:6ebabdb4-f670-4cd5-b3a7-e0dd6108f3f4

Student theses

master thesis

(c) 2016 De Jong, B.A.