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M.Sc. Nicola Luciano

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The CLEAN-Gas project has the goal of developing new experimental and numerical tools for improving natural gas combustion in innovative burners. Experimental investigations are employed for a better understand of unsteady processes, especially in premixed and/or partially premixed regimes, and to allocate reliable data for validation of numerical simulations.

In this framework, 1-D Raman/Rayleigh spectroscopy is applied to understand turbulence-chemistry interaction by simultaneously measuring the major species concentrations (H2, O2, N2, CO, CO2, H2O, CH4) and temperature (Barlow, 2007). The method currently used to evaluate the acquired data, presented in (Fuest F., 2011), is called “Hybrid Method”, and combines both the use of libraries of theoretical spectra and matrix inversion of signals that are not spectrally resolved. It is partially based on a calibration procedure performed over a range of conditions which are likely to be present in the target flames, assuring that the settings used for the data processing are valid for the different thermochemical states measured.

In the Hybrid Method an empiric procedure is used for finding the data processing settings out of the calibration conditions. An alternative analytical procedure based on a statistical approach is currently investigated for the definition of the optimal setting for a defined data set.

More information and contacts available on clean-gas.polimi.it

References

Barlow, R. S., 2007. Laser diagnostics and their interplay with computations to understand turbulent combustion. Proceedings of the Combustion Institute, Volume 31, pp. 49-75.

Fuest F., R. S. Barlow, D. Geyer. F. Seffrin. A. Dreizler., 2011. A hybrid method for data evaluation in 1-D Raman spectroscopy. Proceedings of the Combustion Institute, Volume 33, pp. 815-822.