Mixture preparation by cool flames for diesel-reforming technologies

Hartmann, Lutz; Lucka, K.; Köhne, Heinrich

doi:10.1016/s0378-7753(03)00100-9

Cited by 59 publications

(32 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Such multidimensional maps are essentially similar to 2D "ignition diagrams, " describing the thermal behaviour of technical devices operating in the low-to high-temperature oxidation regimes [9,51]. In Figure 12, an indicative thermochemical behaviour map is depicted; the main operating regions, that is, cool flame and autoignition, are identified by utilizing the predicted temperature increase, between the reactor's inlet and outlet (Δ = out − in ).…”

Section: Thermochemical Behaviour and Tool Validationmentioning

confidence: 90%

“…As a result, in detailed computational fluid dynamics (CFD) simulations of conventional combustion systems, it is common practice to effectively describe the high-temperature oxidative region, which is the most important in terms of heat release and pollutant formation [3]. However, there are specific applications, where the low-and intermediate-temperature oxidative regions become important, for example, homogeneous charge compression ignition (HCCI) internal combustion engines (ICE) [4][5][6], lean premixed prevaporized (LPP) combustors in gas turbines [7,8], and liquid fuel reformers for fuel cell applications [9][10][11] or industrial safety [12,13]; in these cases, cool flame reactions largely determine the overall reactivity and have to be taken into account.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the heat losses through the device boundaries are fully compensated by the heat release of the exothermal cool flame reactions; the device achieves steady-state operation, which is not accompanied by thermal ignition [20]. The utilization of such innovative stabilized cool flame (SCF) reactors allows better control over the combustion process in liquid fuel premixed combustion systems; they can also be used to assist liquid fuel (e.g., diesel oil) reforming to a hydrogen-rich gas for fuel cell applications [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Vourliotakis

Kolaitis

Founti

2014

Journal of Combustion

View full text Add to dashboard Cite

Accurate modelling of preignition chemical phenomena requires a detailed description of the respective low-temperature oxidative reactions. Motivated by the need to simulate a diesel oil spray evaporation device operating in the "stabilized" cool flame regime, a "tabulated chemistry" tool is formulated and evaluated. The tool is constructed by performing a large number of kinetic simulations, using the perfectly stirred reactor assumption. n-Heptane is used as a surrogate fuel for diesel oil and a detailed n-heptane mechanism is utilized. Three independent parameters (temperature, fuel concentration, and residence time) are used, spanning both the low-temperature oxidation and the autoignition regimes. Simulation results for heat release rates, fuel consumption and stable or intermediate species production are used to assess the impact of the independent parameters on the system's thermochemical behaviour. Results provide the physical and chemical insight needed to evaluate the performance of the tool when incorporated in a CFD code. Multidimensional thermochemical behaviour "maps" are created, demonstrating that cool flame activity is favoured under fuel-rich conditions and that cool flame temperature boundaries are extended with increasing fuel concentration or residence time.

show abstract

Section: Thermochemical Behaviour and Tool Validationmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Vourliotakis

Kolaitis

Founti

2014

Journal of Combustion

View full text Add to dashboard Cite

show abstract

“…First, local hot-spots may exist in the reforming catalyst due to the non-uniform temperature distribution, and local catalyst deactivation can be caused by the local high temperature. Second, the large carbon contents may cause coking, which can significantly decrease the effectiveness of the catalyst and thus reforming efficiency [88]. Hard coke such as graphitic is unreactive with hydrogen and can block active sites of the catalyst.…”

Section: Autothermal Reforming Of N-dodecane (Surrogate Of Jp-8) and mentioning

confidence: 99%

Planar Solid-Oxide Fuel Cell System Demonstration at UT SimCenter

Kapadia¹,

Newman²,

Anderson³

2015

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any othe' aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any otheprovision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)12-09-2015 5a. CONTRACT NUMBER. Enter all contract numbers as they appear in the report, e.g. F33315-86-C-5169. REPORT TYPE5b. GRANT NUMBER. Enter all grant numbers as they appear in the report, e.g. AFOSR-82-1234. 5c. PROGRAM ELEMENT NUMBER.Enter all program element numbers as they appear in the report, e.g. 61101 A.5e. TASK NUMBER. Enter all task numbers as they appear in the report, e.g. 05; RF0330201; T4112.5f. WORK UNIT NUMBER. Enter all work unit numbers as they appear in the report, e.g. 001; AFAPL30480105. AUTHOR(S). Enter name(s) of person(s)responsible for writing the report, performing the research, or credited with the content of the report. The form of entry is the last name, first name, middle initial, and additional qualifiers separated by commas, e.g. Smith, Richard, J, Jr. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES).Self-explanatory. PERFORMING ORGANIZATION REPORT NUMBER.Enter all unique alphanumeric report numbers assigned by the performing organization, e.g. BRL-1234; AFWL-TR-85-4017-Vol-21-PT-2. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES).Enter the name and address of the organization(s) financially responsible for and monitoring the work. SPONSOR/MONITOR'S ACRONYM(S).Enter, if available, e.g. BRL, ARDEC, NADC. SPONSOR/MONITOR'S REPORT NUMBER(S).Enter report number as assigned by the sponsoring/ monitoring agency, if available, e.g. BRL-TR-829; -215. DISTRIBUTION/AVAILABILITY STATEMENT. AbstractA three-dimensional, unstructured, multi-species reacting flow solver is developed to model solid oxide fuel cells (SOFCs) as well as catalytic reactors. The finite volume based solver utilizes density-based method to solve the coupled system of governing equations. Numerical results for both SOFC and reactor obtained using the inhouse code are compared with the experimental results from the literature for validation purposes. Effects of mass flow rates of incoming species on performance of SOFC as well as catalytic reactor are investigated. Two different methods namely direct differentiation and discrete adjoint method are implemented in the code to compute sensitiv...

show abstract

“…This mixture can be either fed into premixed combustion devices, which allow better control over the combustion process, or utilized for reforming the fuel to a hydrogen-rich gas. Ongoing research on SCF mixture preparation suggests that this process can be reliably used as part of a Diesel oil reforming technology for fuel cell systems [2,3].…”

mentioning

confidence: 99%

Numerical Simulation of Diesel Spray Evaporation in a “Stabilized Cool Flame” Reactor: A Comparative Study

Kolaitis¹,

Founti²

2008

Flow Turbulence Combust

View full text Add to dashboard Cite

The major objective of this work is to numerically investigate the interacting physical and chemical phenomena that characterize the flow in a stabilized cool flame diesel fuel spray evaporation system. A two-phase RANS computational fluid dynamics code has been developed and used to predict the characteristics of the developing turbulent, multiphase, multi-component, reactive flow-field. The code employs a Eulerian-Lagrangian approach, taking into account the mass, momentum, thermal and turbulent energy exchange between the phases. A variety of physical phenomena, such as turbulent dispersion, droplet evaporation, droplet-wall collision, conjugate heat transfer, drift correction, two-way coupling are taken into account by implementing respective sub-models. Two alternative modelling approaches for the simulation of cool flame reactions have been validated and evaluated by comparing numerical predictions with experimental data from two atmospheric pressure, evaporating Diesel spray, Stabilized Cool Flame reactors. Both models have achieved good quantitative agreement in the majority of the considered test cases. The results have been used to estimate the local physical and chemical characteristic time scales of the occurring phenomena, thus allowing, for the first time, the classification of stabilized cool flames.

show abstract

Mixture preparation by cool flames for diesel-reforming technologies

Cited by 59 publications

References 0 publications

Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Development and Parametric Evaluation of a Tabulated Chemistry Tool for the Simulation of n-Heptane Low-Temperature Oxidation and Autoignition Phenomena

Planar Solid-Oxide Fuel Cell System Demonstration at UT SimCenter

Numerical Simulation of Diesel Spray Evaporation in a “Stabilized Cool Flame” Reactor: A Comparative Study

Contact Info

Product

Resources

About