Documents disponibles écrits par cet auteur

An experimental ignition delay study of alkane mixtures in turbulent flows at elevated pressures and intermediate temperatures / David Beerer in Transactions of the ASME . Journal of engineering for gas turbines and power, Vol. 133 N° 1 (Janvier 2011) 

Public ISBD [article]  in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 1 (Janvier 2011) . - 08 p. Titre : An experimental ignition delay study of alkane mixtures in turbulent flows at elevated pressures and intermediate temperatures Type de document : texte imprimé Auteurs : David Beerer, Auteur ; Vincent McDonell, Auteur ; Scott Samuelsen, Auteur Année de publication : 2012 Article en page(s) : 08 p. Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Chemical  reactors  Delays  Ignition  Natural  gas  technology  Turbulence Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Autoignition delay times of mixtures of alkanes and natural gas were studied experimentally in a high pressure and intermediate temperature turbulent flow reactor. Measurements were made at pressures between 7 atm and 15 atm and temperatures from 785 K to 935 K. The blends include binary and ternary mixtures of methane, ethane, and propane along with various natural gas blends. Based on these data, the effect of higher hydrocarbons on the ignition delay time of natural gas type fuels at actual gas turbine engine conditions has been quantified. While the addition of higher hydrocarbons in quantities of up to 30% was found to reduce the ignition delay by up to a factor of 4, the delay times were still found to be greater than 60 ms in all cases, which is well above the residence times of most engine premixers. The data were used to develop simple Arrhenius type correlations as a function of temperature, pressure, and fuel composition for design use. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...] [article] An experimental ignition delay study of alkane mixtures in turbulent flows at elevated pressures and intermediate temperatures [texte imprimé] / David Beerer, Auteur ; Vincent McDonell, Auteur ; Scott Samuelsen, Auteur . - 2012 . - 08 p. Génie Mécanique Langues : Anglais (eng) in Transactions of the ASME . Journal of engineering for gas turbines and power > Vol. 133 N° 1 (Janvier 2011) . - 08 p. Mots-clés : Chemical  reactors  Delays  Ignition  Natural  gas  technology  Turbulence Index. décimale : 620.1 Essais des matériaux. Défauts des matériaux. Protection des matériaux Résumé : Autoignition delay times of mixtures of alkanes and natural gas were studied experimentally in a high pressure and intermediate temperature turbulent flow reactor. Measurements were made at pressures between 7 atm and 15 atm and temperatures from 785 K to 935 K. The blends include binary and ternary mixtures of methane, ethane, and propane along with various natural gas blends. Based on these data, the effect of higher hydrocarbons on the ignition delay time of natural gas type fuels at actual gas turbine engine conditions has been quantified. While the addition of higher hydrocarbons in quantities of up to 30% was found to reduce the ignition delay by up to a factor of 4, the delay times were still found to be greater than 60 ms in all cases, which is well above the residence times of most engine premixers. The data were used to develop simple Arrhenius type correlations as a function of temperature, pressure, and fuel composition for design use. DEWEY : 620.1 ISSN : 0742-4795 En ligne : http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=JETPEZ00013 [...]

Load-following strategies for evolution of solid oxide fuel cells into model citizens of the grid / Auld, A. E in IEEE transactions on energy conversion, Vol. 24 N° 3 (Septembre 2009) 

Public ISBD [article]  in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 617 - 625 Titre : Load-following strategies for evolution of solid oxide fuel cells into model citizens of the grid Type de document : texte imprimé Auteurs : Auld, A. E, Auteur ; Scott Samuelsen, Auteur ; Jack Brouwer, Auteur Année de publication : 2010 Article en page(s) : pp. 617 - 625 Note générale : Energy Conversion Langues : Anglais (eng) Mots-clés : DC-DC  power  convertors--Distributed  power  generation--Fuel  cell  power  plants--Power  grids--Solid  oxide--fuel  cells--Supercapacitors Résumé : Proper converter design can allow solid oxide fuel cells operated as distributed generators to mutually benefit both the load and the electric utility during steady-state conditions, but dynamic load variations still present challenges. Unlike standard synchronous generators, fuel cells lack rotating inertia and their output power ramp rate is limited by design. Two strategies are herein investigated to mitigate the impact of a large load perturbation on the electric utility grid: 1) external use of ultracapacitor electrical storage connected through a DC-DC converter and 2) internal reduction of steady-state fuel utilization in the fuel cell to enable faster response to output power perturbations. Both strategies successfully eliminate the impact of a load perturbation on the utility grid. The external ultracapacitor strategy requires more capital investment while the internal fuel utilization strategy requires higher fuel use. This success implies that there is substantial flexibility for designing load-following fuel cell systems that are model citizens. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196797&sortType%3Das [...] [article] Load-following strategies for evolution of solid oxide fuel cells into model citizens of the grid [texte imprimé] / Auld, A. E, Auteur ; Scott Samuelsen, Auteur ; Jack Brouwer, Auteur . - 2010 . - pp. 617 - 625. Energy Conversion Langues : Anglais (eng) in IEEE transactions on energy conversion > Vol. 24 N° 3 (Septembre 2009) . - pp. 617 - 625 Mots-clés : DC-DC  power  convertors--Distributed  power  generation--Fuel  cell  power  plants--Power  grids--Solid  oxide--fuel  cells--Supercapacitors Résumé : Proper converter design can allow solid oxide fuel cells operated as distributed generators to mutually benefit both the load and the electric utility during steady-state conditions, but dynamic load variations still present challenges. Unlike standard synchronous generators, fuel cells lack rotating inertia and their output power ramp rate is limited by design. Two strategies are herein investigated to mitigate the impact of a large load perturbation on the electric utility grid: 1) external use of ultracapacitor electrical storage connected through a DC-DC converter and 2) internal reduction of steady-state fuel utilization in the fuel cell to enable faster response to output power perturbations. Both strategies successfully eliminate the impact of a load perturbation on the utility grid. The external ultracapacitor strategy requires more capital investment while the internal fuel utilization strategy requires higher fuel use. This success implies that there is substantial flexibility for designing load-following fuel cell systems that are model citizens. Note de contenu : Bibiogr. En ligne : http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5196797&sortType%3Das [...]