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Effect of nozzle spacing on flow behavior in a lean direct injection combustor
KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Kemiteknik.ORCID-id: 0000-0002-7244-5178
Vise andre og tillknytning
2021 (engelsk)Inngår i: AIAA Scitech 2021 Forum, American Institute of Aeronautics and Astronautics (AIAA) , 2021, s. 1-13Konferansepaper, Publicerat paper (Fagfellevurdert)
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.

sted, utgiver, år, opplag, sider
American Institute of Aeronautics and Astronautics (AIAA) , 2021. s. 1-13
Emneord [en]
Combustion Chambers, Fuel-Air Ratio, Swirling Flow
HSV kategori
Identifikatorer
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
Konferanse
AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2021, 11 January 2021 through 15 January 2021
Merknad

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

Tilgjengelig fra: 2021-11-16 Laget: 2021-11-16 Sist oppdatert: 2025-02-09bibliografisk kontrollert

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Shen, Yazhou

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Ghulam, Mohamad M.Shen, Yazhou
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Totalt: 74 treff
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