气候变化领域集成服务门户(CCPortal): Flowfield impact on distributed combustion in a swirl assisted burner

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DOI	10.1016/j.fuel.2019.116643
	Flowfield impact on distributed combustion in a swirl assisted burner
	Feser J.S.; Karyeyen S.; Gupta A.K.
发表日期	2020
ISSN	162361
卷号	263
英文摘要	Colorless distributed combustion (CDC) is a novel method to enhance flame stability and thermal field uniformity, increase combustion efficiency and reduce pollutants emission, including noise. CDC is achieved through the use of a carefully prepared oxidizer mixture of reduced oxygen concentration through added high temperature reactive species. In this study, a partially premixed, swirl assisted cylindrical combustor utilized a propane-air flame with either nitrogen or carbon dioxide gas in order to reduce the oxygen concentration of the oxidizer. OH* chemiluminescence signatures were used to determine transition to distributed combustion condition. The results showed transition to CDC at approximately 15% using N2, and 17% using CO2 dilution. Emission of NO and CO were determined under conditions approaching CDC. NO levels of only 2 or 1 ppm were achieved using N2 or CO2 dilution, respectively under CDC condition. In order to determine how the flow velocity structure and eddy size effect the stability and emissions a high speed (3 kHz) particle image velocimetry (PIV) system was used. Increase in dilution enhanced both the radial and axial mean and fluctuating velocities under CDC that foster mixing. Additionally, the Kolmogorov length decreased with increase in dilution resulting in smaller eddy size particularly in the swirl lobe region, which enhanced turbulent dissipation that resulted in lower peak temperatures and reduced thermal NOx emission. Investigation of Reynolds stress showed that dilution with CO2 provided stronger impact on stress than N2 due to the increased density and reduced viscosity of CO2. Elsevier Ltd
英文关键词	Colorless distributed combustion; Flow field; Gas turbine combustion; Particle image velocimetry; Ultra-low emission
scopus关键词	Carbon dioxide; Combustion; Computational complexity; Dilution; Flow fields; Flow velocity; Flow visualization; Oxygen; Reynolds number; Rhenium compounds; Turbulent flow; Velocimeters; Velocity measurement; Combustion efficiencies; Fluctuating velocities; Gas-turbine combustion; Low emission; Lower peak temperatures; Oxygen concentrations; Particle image velocimetries; Turbulent dissipation; Flame research
来源期刊	Fuel
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176962
作者单位	Department of Mechanical Engineering, University of Maryland, College Park, MD 20742, United States; Department of Energy Systems Engineering, Faculty of Technology, Gazi University, Teknikokullar 06500, Ankara, Turkey
推荐引用方式 GB/T 7714	Feser J.S.,Karyeyen S.,Gupta A.K.. Flowfield impact on distributed combustion in a swirl assisted burner[J],2020,263.
APA	Feser J.S.,Karyeyen S.,&Gupta A.K..(2020).Flowfield impact on distributed combustion in a swirl assisted burner.Fuel,263.
MLA	Feser J.S.,et al."Flowfield impact on distributed combustion in a swirl assisted burner".Fuel 263(2020).