Numerical study on flame shape transition and structure characteristic of premixed CH4/H2-air in the micro-planar combustor

2021 ◽  
pp. 108460
Author(s):  
Chen Zhou ◽  
Aikun Tang ◽  
Tao Cai ◽  
Dan Zhao ◽  
Qiuhan Huang
Keyword(s):  
Numerical Study ◽  
Structure Characteristic ◽  
Shape Transition ◽  
Flame Shape

scholarly journals Numerical study of the lean premixed PRECCINSTA burner with hydrogen enrichment

2021 ◽  
Vol 312 ◽  
pp. 11014
Author(s):  
Giovanni Filomeno ◽  
Tommaso Capurso ◽  
Marco Torresi ◽  
Giuseppe Pascazio
Keyword(s):  
Numerical Model ◽  
Volume Fraction ◽  
Numerical Study ◽  
Thermal Power ◽  
Hydrogen Combustion ◽  
Operating Conditions ◽  
Pure Hydrogen ◽  
Lean Premixed ◽  
Flame Shape ◽  
Hydrogen Enrichment

Hydrogen combustion is one of the most promising solution to achieve a global decarbonization in power production and transports. Pure hydrogen combustion is far from becoming a standard but, during the energy transition, hydrogen co-firing can be a feasible and economically attractive shortterm measure. The use of hydrogen blending gives rise to several issues related to flashback, NOx emissions and thermo-acoustic instabilities. To improve the understanding of the effect of hydrogen enrichment, herein a numerical analysis of lean premixed hydrogen enriched flames is performed by means of 3D unsteady CFD simulations. The numerical model has been assessed against experimental results for both cold and reacting flows in terms of velocity profile (average) and flame shape (mean OH* radical fields). The burner under investigation is the swirl stabilized PRECCINSTA studied at the Deutsches Zentrum für Luft-und Raumfahrt (DLR). The DLR’s researchers have shown the effect of hydrogen addition on the flame topology and combustion instabilities at various operating conditions in terms of thermal power, equivalence ratio and H2 volume fraction. Simulations are in good accordance with experimental data both in terms of velocity and temperature profiles. The numerical model provides a qualitative estimation of the flame shape.

scholarly journals Flame shape transition in a swirl stabilised liquid fueled burner

2015 ◽  
Vol 35 (3) ◽  
pp. 3365-3372 ◽  
Author(s):  
Antoine Renaud ◽  
Sébastien Ducruix ◽  
Philippe Scouflaire ◽  
Laurent Zimmer
Keyword(s):  
Shape Transition ◽  
Flame Shape

Numerical Study on Combustion Performance Comparison of Premixed Methane-Air in Micro-Combustors with and without Heat Recirculating Channel

2013 ◽  
Vol 394 ◽  
pp. 179-184
Author(s):  
Ai Kun Tang ◽  
Jian Feng Pan ◽  
Xia Shao ◽  
Yang Xian Liu
Keyword(s):  
Single Channel ◽  
Numerical Study ◽  
Flame Temperature ◽  
Combustion Process ◽  
Performance Comparison ◽  
Computation Model ◽  
Heat Recirculation ◽  
Micro Power ◽  
New Type ◽  
Flame Shape

Recently£¬research interests of micro-power generation devices which are based on micro-combustion process have been stimulated by the persistent breakthrough of MEMS techniques. A new type micro-heat recirculating combustor was presented in this paper, and the computation model for premixed methane-air was established which adopting a skeletal reaction mechanism. Combustion characteristics both in heat recirculating combustor and single-channel combustor are analyzed which containing the flame shape, location and temperature at the same simulation conditions. It is found that not only the flame location can be better fixed by heat recirculation measure, but although the flame temperature can be raised for some degrees when compared to the single channel combustor. These results provide some useful information for the design of micro-scale combustors.

Numerical study of the low-frequency atomic dynamics in a Lennard-Jones glass

1998 ◽  
Vol 77 (2) ◽  
pp. 473-484 ◽  
Author(s):  
M. Sampoli, P. Benassi, R. Dell'Anna,
Keyword(s):  
Numerical Study ◽  
Low Frequency ◽  
Lennard Jones

Numerical simulation of the tree higro-thermal response in forest fire environment

2020 ◽  
pp. 57-65
Author(s):  
Eusébio Conceiçã ◽  
João Gomes ◽  
Maria Manuela Lúcio ◽  
Jorge Raposo ◽  
Domingos Xavier Viegas ◽  
...  
Keyword(s):  
Forest Fire ◽  
Numerical Study ◽  
Thermal Response ◽  
View Factor ◽  
Tree Model ◽  
Pine Tree ◽  
Surface Temperatures ◽  
Fire Environment ◽  
Fire Front ◽  
Heat Exchanges

This paper refers to a numerical study of the hypo-thermal behaviour of a pine tree in a forest fire environment. The pine tree thermal response numerical model is based on energy balance integral equations for the tree elements and mass balance integral equation for the water in the tree. The simulation performed considers the heat conduction through the tree elements, heat exchanges by convection between the external tree surfaces and the environment, heat exchanges by radiation between the flame and the external tree surfaces and water heat loss by evaporation from the tree to the environment. The virtual three-dimensional tree model has a height of 7.5 m and is constituted by 8863 cylindrical elements representative of its trunks, branches and leaves. The fire front has 10 m long and a 2 m high. The study was conducted taking into account that the pine tree is located 5, 10 or 15 m from the fire front. For these three analyzed distances, the numerical results obtained regarding to the distribution of the view factors, mean radiant temperature and surface temperatures of the pine tree are presented. As main conclusion, it can be stated that the values of the view factor, MRT and surface temperatures of the pine tree decrease with increasing distance from the pine tree in front of fire.

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