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LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00004473naa a2200385 4500
001oai:DiVA.org:kth-344931
003SwePub
008240403s2024 | |||||||||||000 ||eng|
024a https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3449312 URI
024a https://doi.org/10.1016/j.combustflame.2024.1134252 DOI
040 a (SwePub)kth
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
100a Kojourimanesh, Mohammadu aDept. of Mechanical Engineering, Eindhoven University of Technology, the Netherlands4 aut
2451 0a Evaluation of the thermo-acoustic instability frequency and growth rate via input reflection coefficient measurement for central heating equipment
264 1b Elsevier BV,c 2024
338 a print2 rdacarrier
500 a QC 20240404
520 a Experimental measurement methods and theoretical evaluations based on low-order modeling approaches for both the growth rate and frequency at the onset of thermo-acoustic combustion instability are proposed, and their performance is evaluated. The developed techniques are demonstrated through a systematic measurement of the linear growth rate and frequency of evolving oscillations in the laboratory setup and also applied for the thermo-acoustic qualification of an industrial domestic boiler and a heat cell unit (combination of a burner with a heat-exchanger). Generic measurements have been done for a burner deck with premixed surface-stabilized Bunsen-type flames. The industrial domestic boiler and the heat cell unit are equipped with burners of a similar type but differ by their perforation pattern. They have been tested at different conditions and the experimental and theoretical results are compared. Two modeling strategies are tested: 1- in Laplace domain, with estimating a rational function in the complex domain to fit the measured frequency response, 2- exclusively in frequency domain, without estimating a rational function. Both methods include measurement of the frequency response of two reflection coefficients from i) the upstream part of the system, Rup, and ii) burner with flame completed by the downstream part of the appliance, Rin. Within the first approach, a procedure for an analytic continuation of the measured frequency response to the complex domain is applied and complex eigenfrequencies are calculated by solving the corresponding dispersion equation. An alternative approach was proposed by Kopitz and Polifke and allows estimating both the frequency of oscillation and the growth rate from the analysis of the polar plot of the system's characteristic equation in the frequency domain. The comparison shows that the unstable frequencies can be predicted accurately by both tested modeling strategies. This conclusion holds also for the tested industrial applications. The prediction of the instability growth rates is closer to the measured one when the modeling method in the complex domain is used. However, the frequency domain analysis provides less accurate, but still reasonable estimates of the growth rates and frequencies. Moreover, a good overview of thermo-acoustic performance of each industrial boiler/burner at different conditions is obtained via Rin measurements.
650 7a TEKNIK OCH TEKNOLOGIERx Maskinteknikx Energiteknik0 (SwePub)203042 hsv//swe
650 7a ENGINEERING AND TECHNOLOGYx Mechanical Engineeringx Energy Engineering0 (SwePub)203042 hsv//eng
653 a Anechoic duct termination
653 a Complex frequency
653 a Domestic boiler
653 a Onset of instability
700a Kornilov, Viktoru aDept. of Mechanical Engineering, Eindhoven University of Technology, the Netherlands4 aut
700a Lopez Arteaga, Inesu KTH,Teknisk mekanik,aDept. of Mechanical Engineering, Eindhoven University of Technology, the Netherlands4 aut0 (Swepub:kth)u1gy0h8d
700a de Goey, Philipu aDept. of Mechanical Engineering, Eindhoven University of Technology, the Netherlands4 aut
710a aDept. of Mechanical Engineering, Eindhoven University of Technology, the Netherlandsb Teknisk mekanik4 org
773t Combustion and Flamed : Elsevier BVg 263q 263x 0010-2180x 1556-2921
856u https://doi.org/10.1016/j.combustflame.2024.113425y Fulltext
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-344931
8564 8u https://doi.org/10.1016/j.combustflame.2024.113425

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