Ignition of shock-heated H2-air-steam mixtures

Wang, B.L.; Olivier, H.; Grönig, Hans

doi:10.1016/s0010-2180(02)00552-7

Cited by 98 publications

(59 citation statements)

References 14 publications

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“…The shock tube data obtained by (Snyder, Robertson et al 1965;Bhaskaran, Gupta et al 1973;Slack 1977;Blumenthal, Fieweger et al 1996;Wang, Olivier et al 2003), also exhibit an activation energy transition as a function of pressure and temperature. Quantitatively, the shock tube data and simulation are in agreement in the high-temperature (17 kcal/mol activation energy) region.…”

Section: Autoignitionmentioning

confidence: 79%

“…The ignition delay times from various researchers using flow reactors and shock tubes are shown in Figure 63 (Snyder, Robertson et al 1965;Peschke and Spadaccini 1985;Blumenthal, Fieweger et al 1996;Wang, Olivier et al 2003;Beerer and McDonell 2008;Santoro 2009). Peschke and Spadaccini, as well as Santoro, used flow reactors, while the other investigations used shock tubes.…”

Section: Autoignitionmentioning

confidence: 99%

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Fuel Flexible Turbine System (FFTS) Program

None¹

2012

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Section: Autoignitionmentioning

confidence: 79%

Section: Autoignitionmentioning

confidence: 99%

Fuel Flexible Turbine System (FFTS) Program

None¹

2012

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“…Note that it may also be possible to introduce surface effects into the reaction chamber if it is not cleaned carefully, for example, by removing any inert coating on the reaction chamber walls. It is noted that the shock tube experiments of Wang et al [77] using H 2 /air/steam mixtures also showed that the ignition process is very sensitive to the inner surface quality of the tube. Wang et al [77] further demonstrated that if the tube is contaminated, their measured ignition delay time could not be reproduced.…”

Section: Uncertainties and Issues For Rcm Experimentsmentioning

confidence: 99%

“…It is noted that the shock tube experiments of Wang et al [77] using H 2 /air/steam mixtures also showed that the ignition process is very sensitive to the inner surface quality of the tube. Wang et al [77] further demonstrated that if the tube is contaminated, their measured ignition delay time could not be reproduced. Thus, one 35 must be sure that the experimental data acquired are free from the effect of chamber surface contamination.…”

Section: Uncertainties and Issues For Rcm Experimentsmentioning

confidence: 99%

Using rapid compression machines for chemical kinetics studies

Sung¹,

Curran²

2014

Progress in Energy and Combustion Science

265

127

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Rapid compression machines (RCMs) are used to simulate a single compression stroke of an internal combustion engine without some of the complicated swirl bowl geometry, cycle-to-cycle variation, residual gas, and other complications associated with engine operating conditions. RCMs are primarily used to measure ignition delay times as a function of temperature, pressure, and fuel/oxygen/diluent ratio; further they can be equipped with diagnostics to determine the temperature and flow fields inside the reaction chamber and to measure the concentrations of reactant, intermediate, and product species produced during combustion. This paper first discusses the operational principles and design features of RCMs, including the use of creviced pistons, which is an important feature in order to suppress the boundary layer, preventing it from becoming entrained into the reaction chamber via a roll-up vortex. The paper then discusses methods by which experiments performed in RCMs are interpreted and simulated. Furthermore, differences in measured ignition delays from RCMs and shock tube facilities are discussed, with the apparent initial gross disagreement being explained by facility effects in both types of experiments. Finally, future directions for using RCMs in chemical kinetics studies are also discussed.

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“…At the same axial location, the local reaction gas temperature is measured with a type R thermocouple accurate to ±3 K. Using gas chromatography, it was experimentally verified that CH 2 O is the only product of 27 trioxane decomposition, and trioxane decomposition is much faster than the subsequent reaction of formaldehyde at flow reactor conditions. For modeling purposes, one mole of trioxane reactant could therefore be replaced by three moles of formaldehyde.In earlier work, [13,30], trioxane was melted and delivered as a liquid to the evaporator of a prior atmospheric pressure flow reactor. A similar methodology would have required a complex modification of the present reactor and a different approach to deliver trioxane to the reactor was utilized.…”

mentioning

confidence: 99%

Chemical Kinetics in Support of Syngas Turbine Combustion

Dryer¹

2007

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Executive SummaryThis document is the final report on an overall program formulated to extend our prior work in developing and validating kinetic models for the CO/hydrogen/oxygen reaction by carefully analyzing the individual and interactive behavior of specific elementary and subsets of elementary reactions at conditions of interest to syngas combustion in gas turbines. A summary of the tasks performed under this work are: 1. Determine experimentally the third body efficiencies in H+O 2 +M = HO 2 +M (R1) for CO 2 Results are summarized in this document and its appendices. Three archival papers which contain a majority of the research results have appeared. Those results not published elsewhere are highlighted here, and will appear as part of future publications. Portions of the work appearing in the above publications were also supported in part by the Department of Energy under Grant No. DE-FG02-86ER-13503.As a result of and during the research under the present contract, we became aware of other reported results that revealed substantial differences between experimental characterizations of ignition delays for syngas mixtures and ignition delay predictions based upon homogenous kinetic modeling. We adjusted emphasis of Task 2 to understand the source of these noted disparities because of their key importance to developing lean premixed combustion technologies of syngas turbine applications. In performing Task 3, we also suggest for the first time the very significant effect that metal carbonyls may have on syngas combustion properties. This work is fully detailed in Appendix C. The work on metal carbonyl effects is entirely computational in nature. Pursuit of experimental verification of these interactions was beyond the scope of the present work.3 Results over this Progress Period ApproachThe present research further extended our prior work in developing and validating kinetic models for the CO/hydrogen/oxygen principally studied under Department of Energy Grant No. DE-FG02-86ER-13503, by providing additional experimental data using a Variable Pressure Flow Reactor (VPFR) on the collisional efficiencies of water and carbon dioxide in the reaction H+O 2 +M = HO 2 + M (R1) by carefully analyzing the individual and interactive behavior of specific elementary and subsets of elementary reactions at the conditions of interest, and by extending computational model comparisons with data obtained in this program and those appearing in the literature since 2004 to further test and refine the model at conditions relevant to gas turbine applications. Additionally, syngas contaminant species such as small hydrocarbons (e.g., methane) and other combustion gas components (e.g. NO x ) have been identified and it is suspected that these contaminants may affect syngas chemistry in gas turbine applications, particularly in mixing regions of entering fuel and air. These contaminants can have significant influence on some of the kinetic behavior. The initial research plan was to investigate only the effects of small local amo...

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Ignition of shock-heated H2-air-steam mixtures

Cited by 98 publications

References 14 publications

Fuel Flexible Turbine System (FFTS) Program

Fuel Flexible Turbine System (FFTS) Program

Using rapid compression machines for chemical kinetics studies

Chemical Kinetics in Support of Syngas Turbine Combustion

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