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Effect of nozzle spacing on flow behavior in a lean direct injection combustor
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering.ORCID iD: 0000-0002-7244-5178
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2021 (English)In: AIAA Scitech 2021 Forum, American Institute of Aeronautics and Astronautics (AIAA) , 2021, p. 1-13Conference paper, Published paper (Refereed)
Abstract [en]

A numerical study has been performed on a linear array of five nozzles in a lean direct injection (LDI) combustor for three mass flow rates and four different inter-nozzle spacings, using two equation realizable k − ɛ turbulence model. It is observed that the mass flow rates do not affect the flow patterns in this five nozzle configuration. The two smaller inter-nozzle spacings, s = 1.25d and 1.5d, developed asymmetric flow patterns. Especially at 1.5d, the asymmetry is quite dominant in the core flows of nozzles N2 and N4, due to the non-merging of jets in the shear layers. But, at higher nozzle spacings, s = 1.75d and 2d, the jets merge in the shear layers and move downstream as a single jet. Due to the slower expansion of the flow in the radial direction, strong and compact central toroidal recirculation zones (CTRZ) are formed at smaller inter-nozzle spacings, 1.25d and 1.5d. These compact CTRZs contribute to higher turbulence kinetic energy (TKE) in regions between the nozzles and closer to the dome-plate. These regions correspond to higher velocity and higher shear stress in the flow. As the inter-nozzle spacing is increased, the intensity of TKE decreases between the nozzles.

Place, publisher, year, edition, pages
American Institute of Aeronautics and Astronautics (AIAA) , 2021. p. 1-13
Keywords [en]
Combustion Chambers, Fuel-Air Ratio, Swirling Flow
National Category
Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-304939DOI: 10.2514/6.2021-0292Scopus ID: 2-s2.0-85100314595OAI: oai:DiVA.org:kth-304939DiVA, id: diva2:1611808
Conference
AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021, 11 January 2021 through 15 January 2021
Note

Part of proceedings: ISBN 978-1-62410-609-5, QC 20230117

Available from: 2021-11-16 Created: 2021-11-16 Last updated: 2025-02-09Bibliographically approved

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Shen, Yazhou

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CiteExportLink to record
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  • apa
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