Thermo-acoustic flame instability criteria based on upstream reflection coefficients

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Kojourimanesh, M. (author)

Thermo-acoustic flame instability criteria based on upstream reflection coefficients

Article/chapterEnglish2021

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Elsevier BV,2021
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LIBRIS-ID:oai:DiVA.org:kth-291137
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-291137URI
https://doi.org/10.1016/j.combustflame.2020.11.020DOI

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Language:English
Summary in:English

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SwePubSwePub

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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QC 20210305
A prospective method to assess thermo-acoustic instabilities based on two reflection coefficients measured from the upstream side of the burner is presented and experimentally validated. In order to compose a model which allows predicting the onset of thermo-acoustic instability of combustion in a practical appliance, one has to characterize the thermo-acoustic properties of the burner including the flame as an acoustically active element and acoustic properties of all other (usually passive) components of the combustion appliance both upstream as well as downstream of the burner. This kind of modeling strategy usually faces serious practical problems related to the need of measurements/modeling at the hot downstream part of the system. In the present work, we propose a measurement and a system modeling approach which relies on two acoustic measurements, namely reflection coefficients, only at the cold (burner upstream) part of the combustion appliance. Both reflection coefficients, termed upstream and input, can be readily measured using standard acoustic techniques. The need to measure the input reflection coefficient of an acoustically active subsystem may impose difficulties related to the acoustic instability of the measurement setup itself. The approach and technical solution to handle this problem via a special modification of the excitation source (loudspeaker box) is proposed. The dispersion relation to search for system eigen frequencies is represented in a form that couples the reflection coefficients of the upstream part of the appliance and input reflection coefficient from the downstream part as observed through the burner with flame. This form of the dispersion relation is commonly used in the theory of radio-frequency circuits and recently introduced for thermo-acoustic problems. The proposed method is applied to burners with premixed burner-stabilized Bunsen-type flames. The observed instability conditions and oscillation frequencies are compared with predictions of the proposed modeling approach and reveal good correspondence.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Maskinteknik Energiteknik hsv//swe
ENGINEERING AND TECHNOLOGY Mechanical Engineering Energy Engineering hsv//eng
Acoustic diode
Combustion instability
Dispersion relation
Reflection coefficient measurement

Added entries (persons, corporate bodies, meetings, titles ...)

Kornilov, V. (author)
Lopez Arteaga, InesKTH,Farkost och flyg,Eindhoven University of Technology, Netherlands(Swepub:kth)u1gy0h8d (author)
de Goey, P. (author)
KTHFarkost och flyg (creator_code:org_t)

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In:Combustion and Flame: Elsevier BV225, s. 435-4430010-21801556-2921

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Energy Engineeri ...

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By the university: Royal Institute of Technology

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