Measurement and simulation of acoustic load impedance for boilers

L. Zhou, D. W. Herrin, T. Li

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations


Combustion oscillations are the result of thermoacoustic instabilities. Sound produced from the flame is reflected from the combustion chamber into the mixture chamber. This disturbs both the mixture flow rate and composition, intensifying the sound produced by the volumetric expansion and contraction of the flame. The ratio of the sound pressure to the volume velocity or source strength at the flame is known as the acoustic impedance. Acoustic impedance is a very useful quantity for both assessing whether combustion oscillations are likely to occur and making system modifications to avoid them. Principles for both measuring and simulating the acoustic impedance are summarized in this paper. The impedance is determined both experimentally and via simulation for three different combustion chambers. The methods presented permit the inclusion of structural coupling from the combustion chamber. Additionally, a method for determining the impedance above the plane wave cutoff frequency of the boiler is documented.

Original languageEnglish
Title of host publicationASHRAE Transactions - ASHRAE Annual Conference
Number of pages12
EditionPART 2
StatePublished - 2013
Event2013 ASHRAE Annual Conference - Denver, CO, United States
Duration: Jun 22 2013Jun 26 2013

Publication series

NameASHRAE Transactions
NumberPART 2
ISSN (Print)0001-2505


Conference2013 ASHRAE Annual Conference
Country/TerritoryUnited States
CityDenver, CO

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering


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