Combustion mechanism development and CFD simulation for the prediction of soot emission during flaring

2016 ◽  
Vol 10 (4) ◽  
pp. 459-471 ◽  
Author(s):  
Anan Wang ◽  
Helen H. Lou ◽  
Daniel Chen ◽  
Anfeng Yu ◽  
Wenyi Dang ◽  
...  
2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Daniel-Eugeniu Crunteanu ◽  
Vlad-Alexandru Popa ◽  
Mihail Sima

Abstract Pulse detonation engines work similar to pulsejets, with the major difference taking place in the combustion mechanism. Having detonation, instead of conventional combustion comes with certain benefits, but also, a couple of major issues which will be addressed in this paper. These changes come as a result of the increased amount of energy released by the explosive process, with much higher fluid velocities and temperatures that easily surpass those of conventional engines. These high values of the thermodynamic parameters prove to be a tough technological problem when it comes to producing this type of engines, so this paper aims at analyzing the evolution of these parameters throughout a working cycle of the Tangential Impulse Detonation Engine (TIDE) and how they affect the internal structure of the detonation chamber. The non-steady character of the thermodynamic parameters from a Computational Fluid Dynamics (CFD) simulation will be used a as a starting point for the Finite Element Analysis (FEA), which will help determine whether or not, the structure can withstand the immense load that comes with such violent processes. The final part of this article will provide optimization criteria to decrease the loads generated by the pulsed detonations.


Author(s):  
Francesco Fantozzi ◽  
Paolo Laranci ◽  
Gianni Bidini

Biomass to energy conversion is particularly attractive on the microscale were internal combustion engines such as microturbines may be utilized coupled to an indirect gasification system. The authors have developed the IPRP technology based on rotary kiln pyrolisys and a pilot plant was built in Italy powered by an 80 kWEl microturbine fired by pyrolysis biomass syngas. This paper describes CFD numerical investigations carried out to study the combustion process occurring inside the annular rich-quick-lean combustion chamber of the given microturbine. A RANS analysis has been performed in order to simulate both natural gas and syngas combustion. A mechanisms based on two reduced and detailed chemical kinetic were taken into account and applied to carry out the CFD simulations. The numerical results obtained for NG are presented and compared with the experimental data on emission to validate the numerical assumptions. The combustion mechanism are used also in pyrolysis gas combustion case to investigate the operation of the microturbine fuelled with this biomass derived fuel.


Author(s):  
Junfeng Yang ◽  
Valeri I. Golovitchev ◽  
Chitralkumar V. Naik ◽  
Ellen Meeks

A master combustion mechanism of biodiesel fuels has recently been developed by Westbrook and co-workers [1]. This detailed mechanism involves 5037 species and 19990 reactions, the size, which prohibits its direct use in computational fluid dynamic (CFD) applications. In the present work, various mechanism reduction methods included in the Reaction Workbench software [2] were used to derive a semi-detailed reduced combustion mechanism maintaining the accuracy of the master mechanism for a desired set of engine conditions. The reduced combustion mechanism for a five-component biodiesel fuel was implemented in the FORTÉ CFD simulation package [3] to take advantage of advanced chemistry solver methodologies and advanced spray models. The spray characteristics, e.g. the liquid penetration and flame lift-off distances of RME fuel were modeled in a constant-volume combustion chamber. The modeling results were compared with the experimental data. Engine simulations were performed for the Volvo D12C heavy-duty diesel engine fueled by RME on a 72° sector mesh. Predictions were validated against measured in-cylinder parameters and exhaust emission concentrations. The semi-detailed mechanism was shown to be an efficient and accurate representation of actual biodiesel combustion and emissions formation. Meanwhile, as a comparative study, the simulation based on a detailed diesel oil surrogate mechanism were performed for diesel oil under the same conditions.


2000 ◽  
Vol 10 (PR11) ◽  
pp. Pr11-131-Pr11-141 ◽  
Author(s):  
J.-Y. Choi ◽  
B.-J. Lee ◽  
I.-S. Jeung

2008 ◽  
Author(s):  
Weiqiang Wang ◽  
Richard Clark ◽  
Aiichiro Nakano ◽  
Rajiv K. Kalia ◽  
Priya Vashishta

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