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Mixing and Combustion Characterization of a Staged Combustor With Multiple, High Mass-Ratio Jets in Crossflow

[+] Author Affiliations
Nishant Jain, Jerry M. Seitzman

Georgia Institute of Technology, Atlanta, GA

Paper No. GT2017-65016, pp. V04BT04A064; 13 pages
doi:10.1115/GT2017-65016
From:
  • ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition
  • Volume 4B: Combustion, Fuels and Emissions
  • Charlotte, North Carolina, USA, June 26–30, 2017
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5085-5
  • Copyright © 2017 by ASME

abstract

This study focuses on elucidating the flow and combustion features in the jet/pilot interaction zone of RQL-type air-staged combustors. Multiple air jets enter normally into a vitiated crossflow consisting of the combustion products of natural gas and air (up to an equivalence ratio of ϕ∼1.3). These jets in crossflow (JICF) interact in a test-section with a rectangular cross section whose dimensions are only 3–4 times the size of the jet diameters. In the test section, a total of five jets (three on the bottom and two on the top) can be used to attain parallel and staggered-opposed jet configurations. The combustion and mixing properties are examined using chemiluminescence imaging and planar Mie scattering from seed particles, with the latter also used for PIV velocity measurements. Results are acquired for mass ratios (total jet mass flow to pilot mass flow) as high as two. At these high mass ratios, the jet velocities range from 50–250 m/s while the pilot (crossflow) velocity ranges from 5–35 m/s. At high mass ratios, and therefore high jet momentum ratios, the jets impinge on the opposite walls well before they can transition into a typical far-field regime for unconfined JICF configurations. In these cases, the jet-wall interaction plays a significant role in redirecting the jet momentum and mixing the jet and crossflow fluids. In the case of the staggered-opposed jet configurations, the jet-wall interaction of a jet can greatly influence the near-field region of its neighboring opposed jet. With the high temperature crossflow, chemical times are sufficiently fast that combustion seem to be mixing limited rather than chemistry limited under the conditions considered.

Copyright © 2017 by ASME

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