NDLI: Influence of the Arrangement of Dilution Holes for Dilution Mixing in a Three-Injector Reverse Flow Combustor

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Dai, Wei Zhang, Yan Lin, Yuzhen Yang, Qian Zhang, Chi
Copyright Year	2014
Abstract	The exit temperature profile has a great effect on the reliability and security in a gas turbine. In this paper, the exit temperature profile of a small engine reverse-flow combustor with three injectors test module was experimentally obtained to qualitatively analyze the influence of the dilution hole distribution. The test model was a three-injector rectangular reverse-flow combustor with swirling flow atomizing. A 1D moving thermocouple rake was used to measure the global exit temperature profile of the combustor. The pressure was at ambient pressure with the inlet temperature was 290K. The FAR was in the range of 0.03. The dilution holes were in opposed and staggered arrangements. The experimental results showed that the exit temperature profile was obviously influenced by the dilution holes. Compared with the opposed dilution jets, the staggered dilution jets provided more uniform circumferential exit temperature profile, but a little higher pattern factor of 0.1725. The numerical results showed that the staggered dilution jets generated a larger scale counter-rotating vortex pairs. The inner and outer jets not only did not interact with each other (especially at the outer ring of combustor), but also filled the intermediate regions of dilution jets, resulting in a higher gas mixing rate. Consequently, the staggered dilution jets provided a better mixing performance for the outer ring of combustor.
Sponsorship	International Gas Turbine Institute
File Format	PDF
ISBN	9780791845738
DOI	10.1115/GT2014-25235
Volume Number	Volume 5C: Heat Transfer
Conference Proceedings	ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
Language	English
Publisher Date	2014-06-16
Publisher Place	Düsseldorf, Germany
Access Restriction	Subscribed
Subject Keyword	Temperature Swirling flow Thermocouples Temperature profiles Security Flow (dynamics) Pressure Engines Gas turbines Vortices Ejectors Jets Combustion chambers Reliability
Content Type	Text
Resource Type	Article

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