0

Full Content is available to subscribers

Subscribe/Learn More  >

Time-Resolved Three-Component PIV Investigation of Flashback in Stratified Flames

[+] Author Affiliations
Rakesh Ranjan, Noel Clemens

University of Texas at Austin, Austin, TX

Paper No. GT2017-64769, pp. V04BT04A040; 10 pages
doi:10.1115/GT2017-64769
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

Flashback of stratified swirl flames in a model combustor with an axial swirler and a centerbody were investigated at 1 atm and 3 atm. The global equivalence ratio for the flashback conditions is kept at 0.63 and 0.85 for atmospheric and elevated pressure experiments respectively. The bulk velocity of the fuel-air mixture during the flashback is set to 2.5 m/s for all experiments. Stratification in the flow is achieved by injecting methane through the fuel-ports on the swirler vanes. The nature of stratification is assessed by conducting planar laser induced fluorescence (PLIF) experiments in non-reacting flows. Acetone was used as fuel tracer which allowed the calculation of spatial distribution of equivalence ratio in the mixing tube. The ensemble-averaged distribution confirmed the radial stratification in the mixing tube. Instantaneous PLIF measurements showed intermittent presence of fuel rich structures close to the center-body. For flashback experiments, time-resolved three-component PIV and simultaneous chemiluminescence imaging at 4kHz were applied to investigate the interaction between the flame and the stratified flow. The global behavior of flashback was characterized by a large flame tongue swirling around the center-body during upstream propagation. The flame tongue stopped propagating at an intermediate location and kept swirling around the center-body. A comparison with fully premixed flashback showed that the stratified flame was more wrinkled and the radial extent of stratified flame brush was larger than the fully premixed cases. Reacting flow experiments at elevated pressure showed highly wrinkled flame surface due to the presence of turbulence and local variation in equivalence ratio.

Copyright © 2017 by ASME
Topics: Flames

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In