0

Full Content is available to subscribers

Subscribe/Learn More  >

Experimental Study of a Low-NOx Lean Direct Injection Combustor Design

[+] Author Affiliations
Abdelallah Ahmed, Jacob Haseman, Samir Tambe, San-Mou Jeng

University of Cincinnati, Cincinnati, OH

Paper No. GT2016-56499, pp. V04AT04A027; 11 pages
doi:10.1115/GT2016-56499
From:
  • ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition
  • Volume 4A: Combustion, Fuels and Emissions
  • Seoul, South Korea, June 13–17, 2016
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4975-0
  • Copyright © 2016 by ASME

abstract

An experimental investigation was undertaken to develop a lean direct injection (LDI) combustor concept. The LDI concept consisted of a 9-point fuel injection system setup in a 3×3 array, where each point is made of a fuel nozzle fitted into a counter-rotating radial-radial swirler. Each swirler consisted of an inner, primary swirler, and an outer, secondary swirler, with opposite flow rotation. The experimental investigation consisted of atmospheric combustion and lean blow-out (LBO) tests, and high pressure combustion. All tests utilized a pressure drop of 4% across the swirlers. Parameters tested included variable swirler strengths and fuel nozzle injection depth. Fuel staging was employed on all configurations.

Two swirlers, with swirl numbers (SN) of 0.64 and 1.07, were used in the swirler array, with the baseline configuration consisting entirely of the low-SN swirlers, and configurations 2 and 3 utilizing 1 and 3, respectively, of the high-SN swirlers. Configuration 2 has the high-SN swirler at the center, whereas Configuration 3 uses three high-SN swirlers in the center row. From the atmospheric tests, flame stability and lean blowout occurred at lower equivalence ratios for configuration 2 and 3, indicating that the presence of the high-swirl swirler improved flame anchoring. Two different nozzle insertion depths were tested, with a deep insertion depth providing partial prefilming on the venturi, and a shallow insertion depth with no pre-filming. Partial pre-filming greatly aided in fuel/air mixing and produced a shorter, blue flame, which was stable, and had lower LBO limit as compared to full direct injection (shallow insertion), which resulted in more unstable, longer, yellow flames.

Emission measurements were conducted at high pressures using water cooled sampling probe, and a gas analyzer system to measure the emission indices of NOx and CO. The results showed that this LDI design produced emissions values comparable to those produced by current lean premixed prevaporized (LPP) combustor designs, well below current ICAO standards.

Copyright © 2016 by ASME

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