Investigation of combustion dynamics in a cavity-based combustor with high-speed laser diagnostics

Investigation of combustion dynamics in a cavity-based combustor with high-speed laser diagnostics The dynamics of the flame/flow interaction produced in an optically accessible, premixed, and staged cavity-based combustor was investigated with high-speed particle image velocimetry (PIV) and OH-planar laser-induced fluorescence (OH-PLIF) . The combined PIV and OH-PLIF images were recorded at 2.5 kHz to assess stabilization mechanisms occurring between the cavity and the mainstream. Dynamic pressure and global heat-release rate fluctuations were complementary measured. Important characteristics were identified for two operating conditions, differing from the ratio of momentum J (taken between the mainstream and the cavity jet): a high ratio of momentum ( $$J = 7.1$$ J = 7.1 ) produced a “stable” flow, whereas a lower one ( $$J = 2.8$$ J = 2.8 ) displayed “unstable” conditions. Analysis of the “unstable” case revealed an intense flow instability, primarily due to premixed flow rate fluctuations inside the cavity. This effect is confirmed from a proper orthogonal decomposition analysis of PIV data, which illustrates the prominent role of large-scale flow oscillations in the whole combustor. Furthermore, the simultaneous analysis of flow velocities and gas state (either unburned or burned) displayed important fluctuations inside the shear layer, reducing effective flame-holding capabilities. By contrast, the increase in the ratio of momentum in the “stable” case reduces significantly the penetration of the cavity flow into the mainstream and consequently produces stable properties of the shear layer, being valuable to considerably improve flame stabilization. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Investigation of combustion dynamics in a cavity-based combustor with high-speed laser diagnostics

Loading next page...
 
/lp/springer_journal/investigation-of-combustion-dynamics-in-a-cavity-based-combustor-with-4J27HZjJ0r
Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2016 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-016-2135-7
Publisher site
See Article on Publisher Site

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

Monthly Plan

  • Read unlimited articles
  • Personalized recommendations
  • No expiration
  • Print 20 pages per month
  • 20% off on PDF purchases
  • Organize your research
  • Get updates on your journals and topic searches

$49/month

Start Free Trial

14-day Free Trial

Best Deal — 39% off

Annual Plan

  • All the features of the Professional Plan, but for 39% off!
  • Billed annually
  • No expiration
  • For the normal price of 10 articles elsewhere, you get one full year of unlimited access to articles.

$588

$360/year

billed annually
Start Free Trial

14-day Free Trial