scholarly journals Local entrainment velocity in a premixed turbulent annular jet flame

2019 ◽  
Vol 37 (2) ◽  
pp. 2493-2501
Author(s):  
Luis Cifuentes ◽  
Andreas Kempf ◽  
Cesar Dopazo
Keyword(s):  
Jet Flame ◽  
Entrainment Velocity ◽  
Annular Jet

scholarly journals Forced flow response analysis of a turbulent swirling annular jet flame

2021 ◽  
Vol 33 (8) ◽  
pp. 085124
Author(s):  
Christopher M. Douglas ◽  
Benjamin L. Emerson ◽  
Santosh Hemchandra ◽  
Timothy C. Lieuwen
Keyword(s):  
Forced Flow ◽  
Response Analysis ◽  
Jet Flame ◽  
Flow Response ◽  
Annular Jet

Characteristics of Flow and Flame Behavior Behind Rifled/Unrifled Nozzles

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Kuo C. San ◽  
Hung J. Hsu
Keyword(s):  
Turbulent Flame ◽  
Flow Characteristics ◽  
Combustion Efficiency ◽  
Flame Height ◽  
Mixing Efficiency ◽  
Jet Flame ◽  
Annular Jet ◽  
Image Velocimetry ◽  
Flame Behavior ◽  
The Relationship

A novel rifled nozzle was installed behind a conventional combustion exhauster to improve combustion efficiency. The rifled nozzles improve the momentum transmission, turbulent strength, and mixing efficiency between the central jet and annular jet. The flow characteristics behind the nozzles (rifled and unrifled) were visualized and detected using the smoke-wire flow visualization, particle image velocimetry, and hot-wire anemometry. The cold flow structures were categorized into four modes—jet flow, single bubble, dual bubble, and turbulent flow. The topological scheme was adopted to analyze and verify these flow modes. The flame structures behind the nozzles (rifled and unrifled) are classified into three modes—jet flame, flickering flame, and turbulent flame—using the direct-photo visualization. The flame height of a 12-rifled nozzle is decreased by about 50% under that of an unrifled nozzle. The flame shedding frequency declines rapidly in the flickering flame mode and the relationship between the Strouhal number (Sr) and annular velocity (ua) is Sr=0.0238+0.13/ua.

MODELING OF A TURBULENT ETHYLENE/AIR JET FLAME USING HYBRID FINITE VOLUME/MONTE CARLO METHODS

2009 ◽  
Vol 1 (1) ◽  
pp. 37-53 ◽  
Author(s):  
Ranjan S. Mehta ◽  
Anquan Wang ◽  
Michael F. Modest ◽  
Daniel C. Haworth
Keyword(s):  
Monte Carlo ◽  
Finite Volume ◽  
Monte Carlo Methods ◽  
Jet Flame ◽  
Air Jet

Hydrodynamic instability and shear layer effect on the sound emission of a turbulent jet flame

2015 ◽  
Author(s):  
Stephan Schlimpert ◽  
Seong Ryong Koh ◽  
Antje Feldhusen ◽  
Benedikt Roidl ◽  
Matthias H. Meinke ◽  
...  
Keyword(s):  
Shear Layer ◽  
Hydrodynamic Instability ◽  
Turbulent Jet ◽  
Sound Emission ◽  
Jet Flame ◽  
Layer Effect

scholarly journals Hydrodynamic Vortex Structures in a Diffusion Jet Flame

2019 ◽  
Author(s):  
Dubnishchev Yuri Nikolaevich ◽  
Lemanov Vadim Vladimirovich ◽  
Lukashov Vladimir Vladimirovich ◽  
Arbuzov Vitali Anisiforovich ◽  
Sharov Konstantin Aleksandrovich
Keyword(s):  
Vortex Structures ◽  
Jet Flame

scholarly journals Asymmetric vortex shedding in the wake of an abruptly expanding annular jet

2021 ◽  
Vol 62 (4) ◽  
Author(s):  
Maarten Vanierschot ◽  
Mustafa Percin ◽  
Bas W. van Oudheusden
Keyword(s):  
Vortex Shedding ◽  
Asymmetric Vortex ◽  
Annular Jet

scholarly journals Effect of Temperature Conditions on Flame Evolutions of Turbulent Jet Ignition

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2226
Author(s):  
Jiaying Pan ◽  
Yu He ◽  
Tao Li ◽  
Haiqiao Wei ◽  
Lei Wang ◽  
...  
Keyword(s):  
Flame Propagation ◽  
Early Stage ◽  
Turbulent Jet ◽  
Combustion Stability ◽  
Effect Of Temperature ◽  
Main Chamber ◽  
Detailed Chemical Kinetics ◽  
Jet Flame ◽  
Spherical Flame ◽  
Temperature Conditions

Turbulent jet ignition technology can significantly improve lean combustion stability and suppress engine knocking. However, the narrow jet channel between the pre-chamber and the main chamber leads to some difficulties in heat exchange, which significantly affects combustion performance and mechanical component lifetime. To clarify the effect of temperature conditions on combustion evolutions of turbulent jet ignition, direct numerical simulations with detailed chemical kinetics were employed under engine-relevant conditions. The flame propagation in the pre-chamber and the early-stage turbulent jet ignition in the main chamber were investigated. The results show that depending on temperature conditions, two types of flame configuration can be identified in the main chamber, i.e., the normal turbulent jet flame propagation and the spherical flame propagation, and the latter is closely associated with pressure wave disturbance. Under low-temperature conditions, the cold jet stoichiometric mixtures and the vortexes induced by the jet flow determine the early-stage flame development in the main chamber. Under intermediate temperature conditions, pre-flame heat release and leading pressure waves are induced in the jet channel, which can be regarded as a transition of different combustion modes. Whereas under high-temperature conditions, irregular auto-ignition events start to occur, and spherical flame fronts are induced in the main chamber, behaving faster flame propagation.

Large eddy simulation of a supersonic lifted jet flame in the high-enthalpy coflows

2021 ◽  
Author(s):  
Chaoyang Liu ◽  
Ning Wang ◽  
Kai Yang ◽  
Dongpeng Jia ◽  
Yu Pan
Keyword(s):  
Large Eddy Simulation ◽  
Jet Flame ◽  
High Enthalpy ◽  
Eddy Simulation ◽  
Large Eddy
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