Spectroscopic and chemical-kinetic analysis of the phases of HCCI autoignition and combustion for single- and two-stage ignition fuels

2008 ◽  
Vol 154 (3) ◽  
pp. 387-409 ◽  
Author(s):  
Wontae Hwang ◽  
John Dec ◽  
Magnus Sjöberg
Author(s):  
G. Arvind Rao ◽  
Yeshayahou Levy ◽  
Ephraim J. Gutmark

Flameless combustion (FC) is one of the most promising techniques of reducing harmful emissions from combustion systems. FC is a combustion phenomenon that takes place at low O2 concentration and high inlet reactant temperature. This unique combination results in a distributed combustion regime with a lower adiabatic flame temperature. The paper focuses on investigating the chemical kinetics of an prototype combustion chamber built at the university of Cincinnati with an aim of establishing flameless regime and demonstrating the applicability of FC to gas turbine engines. A Chemical reactor model (CRM) has been built for emulating the reactions within the combustor. The entire combustion chamber has been divided into appropriate number of Perfectly Stirred Reactors (PSRs) and Plug Flow Reactors (PFRs). The interconnections between these reactors and the residence times of these reactors are based on the PIV studies of the combustor flow field. The CRM model has then been used to predict the combustor emission profile for various equivalence ratios. The results obtained from CRM model show that the emission from the combustor are quite less at low equivalence ratios and have been found to be in reasonable agreement with experimental observations. The chemical kinetic analysis gives an insight on the role of vitiated combustion gases in suppressing the formation of pollutants within the combustion process.


Fuel ◽  
2021 ◽  
Vol 288 ◽  
pp. 119710
Author(s):  
Subhankar Mohapatra ◽  
Subrat Garnayak ◽  
Bok Jik Lee ◽  
Ayman M. Elbaz ◽  
William L. Roberts ◽  
...  

Radio Science ◽  
2017 ◽  
Vol 52 (5) ◽  
pp. 521-538 ◽  
Author(s):  
Jeffrey M. Holmes ◽  
Rainer A. Dressler ◽  
Todd R. Pedersen ◽  
Ronald G. Caton ◽  
Daniel Miller

Author(s):  
M. M. Y. Waly ◽  
S. C. Li ◽  
F. A. Williams

This paper reports results of experimental and numerical investigations on ethane-air two-stage combustion in a counterflow burner where the fuel stream, which is partially premixed with air for equivalence ratios from 1.6 to 3.0, flows against a pure air stream. Similar to methane, the two-stage ethane combustion exhibits a green fuel-rich premixed flame and a blue diffusion flame. Flame structures, including concentration profiles of stable intermediate species such as C2H4, C2H2 and CH4, are measured by a gas chromatography and are calculated by numerical integrations of the conservation equations employing an updated elementary chemical-kinetic data base. The implications of the results from these experimental measurements and numerical predictions are summarized, the flame chemistry of ethane two-stage combustion at different degrees of premixing (or equivalence ratio) is discussed, and the relationship between NOx formation and the degree of premixing is established. The present work helps to increase understanding of flame chemistry of hydrocarbon fuels, identify important reactions for pollutant formation and suggest means to reduce emissions.


2019 ◽  
Vol 730 ◽  
pp. 399-406 ◽  
Author(s):  
Sibo Wang ◽  
Jinlu Yu ◽  
Weida Cheng ◽  
Yuan Ma ◽  
Runze Zheng ◽  
...  

2016 ◽  
Vol 128 ◽  
pp. 194-202 ◽  
Author(s):  
Andrew St. George ◽  
R. Driscoll ◽  
V. Anand ◽  
E. Gutmark

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