ELTE Eötvös Loránd University
1117 Budapest Pázmány Péter sétány 1/A, Hungary
room 637 extension 1108
room 638 extension 1109
room 643 extension 1909
e-mail: turanyi@chem.elte.hu
Modelling of JP-8 distributed combustion using a HyChem mechanism under gas turbine conditions
The critical advantages of liquid fuels in aviation over alternative energy carriers imply their dominance in the upcoming decades. The Mixture Temperature Controlled (MTC) combustion concept allows spatially homogeneous, efficient burning (distributed combustion) with low pollutant emission. MTC combustion of jet fuel JP-8 was investigated in an atmospheric burner, and the measured pollutant concentrations in the flue gas were reproduced using the Hybrid Chemistry (HyChem) approach employing Perfectly Stirred Reactor simulations. Using this robust approach comes with losing spatiotemporal characteristics if the mixture homogeneity assumption is globally valid. The effect of residence time and pressure under typical gas turbine operating conditions was investigated. Stable combustion was present above 3 ms residence time at all pressures, while the lower limit was 0.3 ms. The residence time interval of stable operation could be extended by applying flue gas recirculation. NO emission can be reduced by increasing the operating pressure, while the N2O production is dominant only up to 20 bar and in the 10–100 ms residence time range. CO emission vanishes above 10 ms residence time. Ultra-low emission operation requires >20 bar pressure and 10 ms residence time with distributed combustion, requiring larger combustion chambers for future jet engines.
Optima++ is a general framework for manipulating experimental data related to combustion chemistry, carrying out simulations of such experiments, performing model optimization and analysis, and providing auxiliary features for the above tasks. Optima++ is able to handle simulation codes Cantera, FlameMaster, OpenSMOKE++ and ZeroRK. Also, Chemkin Pro is coming soon.
ReSpecTh is an information system of the ELKH-ELTE Complex Chemical Systems Research Group, prepared in collaboration with the ELTE Laboratory of Molecular Structure and Dynamics and the ELTE Chemical Kinetics Laboratory. ChemKinLab maintains the Reaction Kinetics (Re) branch. Currently this combustion chemistry database contains 162026 data points in 3641 XML-format data files and it has 913 registered users.
ReSpecTh Kinetics Data Format Specification v2.5
A series of tutorial videos were created on the efficient creation combustion data files, validation of combustion mechanisms, and using our codes on computer clusters. Also, a Hungarian language video describes the research opportunities in our lab for ELTE undergraduate students.
An interactive web site, where the users may find Arrhenius parameters of gas phase elementary reactions determined in direct measurements, theoretical calculations or have been used in modelling studies. The users may recalculate the uncertainty limits of the rate coefficients. The editors have the right to upload data sheets for new reactions and to add, delete or modify existing data sheets. The editor status may be granted to any registered user upon request to the administrator.
Visit k-evaluation web page
Reaction fluxes of a combustion simulation can be visualized in the forms of still pictures and videos.
We maintain a collection of a series of Chemkin-format reaction mechanisms for the combustion of the following fuels:
hydrogen, syngas, methanol, ethanol, methane, butanol, fuels+NOx.