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Large Eddy Simulations for Indirect Combustion Noise Assessment in a Nozzle Guide Vane Passage
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics. (FLOW)
KTH, School of Engineering Sciences (SCI), Mechanics. (FLOW)
KTH, School of Engineering Sciences (SCI), Mechanics. (Competence Center for Gas Exchange (CCGEx), FLOW)ORCID iD: 0000-0001-7330-6965
2019 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987, Vol. 102, no 2, p. 299-311Article in journal (Refereed) Published
Abstract [en]

The combustion noise in aero-engines is known to originate from two different sources. First, the unsteady heat release in the combustion chamber generates the direct combustion noise. Second, hot and cold spots of air generated by the combustion process are convected and accelerated by the turbine stages and give rise to the so-called indirect combustion noise. The present work targets, by using a numerical approach, the generation mechanism of indirect combustion noise for a simplified geometry of a turbine stator passage. Periodic temperature fluctuations are imposed at the inlet, permitting to simulate hot and cold packets of air coming from the unsteady combustion. Three-dimensional Large Eddy Simulation (LES) calculations are conducted for transonic operating conditions to evaluate the blade acoustic response to the forced temperature perturbations at the inlet plane. Transonic conditions are characterized by trailing edge expansion waves and shocks. It is notably shown that their movement can be excited if disturbances with a particular frequency are injected in the domain.

Place, publisher, year, edition, pages
Springer Netherlands, 2019. Vol. 102, no 2, p. 299-311
Keywords [en]
Indirect Combustion Noise, Nozzle Guide Vane Passage, Large Eddy Simulations
National Category
Fluid Mechanics and Acoustics
Research subject
Aerospace Engineering
Identifiers
URN: urn:nbn:se:kth:diva-251111DOI: 10.1007/s10494-018-9964-9ISI: 000465588800004Scopus ID: 2-s2.0-85052594186OAI: oai:DiVA.org:kth-251111DiVA, id: diva2:1314621
Note

QC 20190514

Available from: 2019-05-09 Created: 2019-05-09 Last updated: 2019-05-14Bibliographically approved

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Publisher's full textScopushttps://doi.org/10.1007/s10494-018-9964-9

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