Near field sound of a HRSG


  • Werner Richarz Echologics Engineering Ltd., 6295 Northam Dr, Mississauga, ON, L4V 1W8, Canada


Waste heat, Acoustic pressures, Correction factors, Duct acoustics, Empirical data, Field measurement, Heat recovery steam generators, Historical data, Near-field sound, Normal displacement, Sound pressures, Source mechanisms, Unsteady pressure fields


The prediction of near field sound for large heat recovery steam generators (HRSG) is largely based on empirical data based on historical data. One of the reasons is that the underlying source mechanisms are rather complex. The unsteady pressure field inside the HRSG is a combination of turbulent and acoustic pressures. The methodology is based on a series of field measurements comprising both single microphone surveys and cross- spectral density/transfer functions measurements. It is common practice to assume that the near field sound pressure is determined by the local normal displacement of the panels. One approach, that has yielded good results, consists of subdividing the HRSG into a series of virtual ducts of varied cross-sections. The panel excitation consists of the local sound pressure, deduced from one dimensional duct acoustics, and a correction factor for the local boundary layer.

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How to Cite

Richarz W. Near field sound of a HRSG. Canadian Acoustics [Internet]. 2012 Sep. 1 [cited 2024 Jul. 21];40(3):62-3. Available from:



Proceedings of the Acoustics Week in Canada