Piloted methane/air jet flames: Transport effects and aspects of scalar structure

2005 ◽  
Vol 143 (4) ◽  
pp. 433-449 ◽  
Author(s):  
R BARLOW ◽  
J FRANK ◽  
A KARPETIS ◽  
J CHEN
Keyword(s):  
Jet Flames ◽  
Air Jet ◽  
Transport Effects ◽  
Scalar Structure

scholarly journals Scalar structure of turbulent partially-premixed dimethyl ether/air jet flames

2015 ◽  
Vol 35 (2) ◽  
pp. 1235-1242 ◽  
Author(s):  
F. Fuest ◽  
G. Magnotti ◽  
R.S. Barlow ◽  
J.A. Sutton
Keyword(s):  
Dimethyl Ether ◽  
Jet Flames ◽  
Air Jet ◽  
Scalar Structure ◽  
Partially Premixed

Influence of Burner Material, Tip Temperature, and Geometrical Flame Configuration on Flashback Propensity of H2-Air Jet Flames

2013 ◽  
Vol 136 (2) ◽  
Author(s):  
Zhixuan Duan ◽  
Brendan Shaffer ◽  
Vincent McDonell ◽  
Georg Baumgartner ◽  
Thomas Sattelmayer
Keyword(s):  
Jet Flames ◽  
Comprehensive Overview ◽  
High Hydrogen ◽  
Jet Flame ◽  
Practical Applications ◽  
Geometric Configurations ◽  
Air Jet ◽  
Low Emission ◽  
Flame Burner ◽  
Negative Impacts

Flashback is a key operability issue for low emission premixed combustion systems operated on high hydrogen content fuels. Previous work investigated fuel composition impacts on flashback propensity and found that burner tip temperature was important in correlating flashback data in premixed jet flames. An enclosure around the jet flame was found to enhance the flame–burner rim interaction. The present study further addresses these issues using a jet burner with various geometric configurations and interchangeable materials. Systematic studies addressing the quantitative influence of various parameters such as tip temperature, burner material, enclosure size, and burner diameter on flashback propensity were carried out. A comprehensive overview of the flashback limits for all conditions tested in the current study as well as those published previously is given. The collective results indicate that the burner materials, tip temperature, and flame confinement play significant roles for flashback propensity and thus help explain previous scatter in flashback data. Furthermore, the present work indicates that the upstream flame propagation during flashback is affected by the burner material. The material with lower thermal conductivity yields larger flashback propensity but slower flame regression inside the tube. These observations can be potentially exploited to minimize the negative impacts of flashback in practical applications.

Large Eddy Simulation of Pilot Stabilized Turbulent Premixed CH4+Air Jet Flames

2018 ◽  
Author(s):  
Veeraraghava Raju Hasti ◽  
Gaurav Kumar ◽  
Shuaishuai Liu ◽  
Robert P. Lucht ◽  
Jay P. Gore
Keyword(s):  
Large Eddy Simulation ◽  
Jet Flames ◽  
Eddy Simulation ◽  
Air Jet ◽  
Large Eddy ◽  
Turbulent Premixed

scholarly journals PIV and OH PLIF study of impinging propane-air jet-flames

2016 ◽  
Vol 754 ◽  
pp. 072001 ◽  
Author(s):  
Z D Kravtsov ◽  
Z D Tolstoguzov ◽  
L M Chikishev ◽  
V M Dulin
Keyword(s):  
Jet Flames ◽  
Air Jet

scholarly journals Characterization of Periodic, Quasiperiodic, and Chaotic States in Nonpremixed Biodiesel/Air Jet Flames

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Jianxin Xu ◽  
Hua Wang ◽  
Hui Fang
Keyword(s):  
Image Analysis ◽  
Maximum Lyapunov Exponent ◽  
Recurrence Plots ◽  
Jet Flames ◽  
Fuel Flow ◽  
Air Jet ◽  
Analysis Technique ◽  
Tip Position ◽  
Relative Change

Characterization for nonpremixed biodiesel/air jet flames instability is investigated by the 0-1 test for chaos and recurrence plots. Test conditions involve biodiesel from Jatropha curcas. L-fueled flames have inlet oil pressure of 0.2–0.6 MPa, fuel flow rates (Q1) of 15–30 kg/h, and combustion air flow rate (Q2) of 150–750 m3/h. This method is based on image analysis and nonlinear dynamics. Structures of flame are analyzed using an image analysis technique to extract position series which are representative of the relative change in temperature of combustion chamber. Compared with the method of maximum Lyapunov exponent, the 0-1 test succeeds in detecting the presence of regular and chaotic components in flame position series. Periodic and quasiperiodic characteristics are obtained by the Poincaré sections. A common characteristic of regular nonpremixed flame tip position series is detected by recurrence plots. Experimental results show that these flame oscillations follow a route to chaos via periodic and quasiperiodic states.

Comparison of Two Methods to Predict Boundary Layer Flashback Limits of Turbulent Hydrogen-Air Jet Flames

2017 ◽  
Vol 100 (3) ◽  
pp. 849-873 ◽  
Author(s):  
Vera Hoferichter ◽  
Christoph Hirsch ◽  
Thomas Sattelmayer ◽  
Alireza Kalantari ◽  
Elliot Sullivan-Lewis ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Jet Flames ◽  
Air Jet
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