Time-Resolved Simultaneous Determination of Local Temperature and Species Concentration in Liquid Petrol Gas Injection Using Laser-Induced Gratings
Zusammenfassung der Projektergebnisse
In collaboration with Dr. D.N. Kozlov (A.M. Prokhorov General Physics Institute, Russian Academy of Sciences) the laser-induced gratings (LIGs) technique was developed to accomplish first simultaneous spatially- and temporally-resolved measurements of temperature and species concentration. This method was demonstrated and tested in a laboratory pressurized fuel injection system. The achieved concentration and temperature results are comparable to combined CARS/Raman measurements we performed at slightly different operation conditions in the past. A comparison the standard deviations of both measurements show that the concentration determination is more precise with the LIG approach proposed here and the temperature measurements are more precise with rotational CARS. The proposed evaluation procedure is suitable for a temperature regime relevant for injection processes. The propane concentration range which could be addressed is up to now limited up to approx. 4% of propane. This has to be enhanced in future. Possibilities are e.g. to perform a two-dimensional fit of the complete LIG-signal or to use a Fast Fourier Technique (FFT). This seems to be attractive because a significant data reduction can be achieved and the evaluation will be faster. A FFT has the additional advantage that noise could be separated from the signal. Also using the modulation depth of the LIG signal is a possible way to overcome this limitation. In a future proposal this should be investigated. Additionally it would also be interesting to find out if the LIG approach developed here, using a combination of thermal and electrostrictive contribution, could be applied for other fuels relevant in engine combustion.
Projektbezogene Publikationen (Auswahl)
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Two-Photon Excitation of Thermal Laser-Induced Gratings Using Radiation of a Single Broadband Laser. Opt. Express 16, S. 18379–18389 (2008)
D. N. Kozlov, M. Weikl, J. Kiefer, T. Seeger, A. Leipertz
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Berührungslose, zeitaufgelöste Bestimmung der lokalen Luftzahl bei der Gemischbildung unter Nutzung der LIG-Technik. Leipertz (Hrsg.), (Berichte zur Energie- und Verfahrenstechnik -BEV-, Heft 09.2, Esytec, Erlangen 2009) S. 149-159
J. Kiefer, T. Seeger, A. Leipertz, D.N. Kozlov, V.V. Smirnov
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Charakterisierung der Propandirekteinspritzung durch laseroptische Bestimmung der lokalen Stöchiometrie. 24 Flammentag, VDI Berichte 2056, S. 557-560 (2009)
T. Seeger, J. Kiefer, A. Leipertz, D.N. Kozlov, V. V. Smirnov
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Development of the Laser-Induced Grating Technique for Simultaneous Temperature and Fuel Concentration Measurements in Gas Mixtures. European Conference on nonlinear Optical Spectroscopy (ECONOS 2009), Frascati, Italien, Mai 2009
B. Roshani, M. Cam, J. Kiefer, T. Seeger, A. Leipertz, D.N. Kozlov, V.V. Smirnov
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Determination of Physico-Chemical Parameters of Ionic Liquids and their Mixtures with Solvents Using Laser-Induced Gratings. Phys. Chem. B 115, 8528-8533 (2011)
D. Kozlov, J. Kiefer, T. Seeger, A.P. Froba, A. Leipertz
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Laser-Induced Gratings in Pure and Dissolved Ionic Liquids. European Conference on nonlinear Optical Spectroscopy (ECONOS 2011), Twente, Niederlande, Mai 2011
D. N. Kozlov, J. Kiefer, T. Seeger, A. P. Fröba, A. Leipertz
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Temporally- and Spatially-Resolved Quantitative Characterization of Fuel Spray Propagation Through Air Using Light Scattering Techniques. Proceedings: Conference on Liquid Atomization and Spray Systems (ILASS), Estoril, (2011)
B. Roshani, A. Flügel, L. Zigan, I. Schmitz, D.N. Kozlov, T. Seeger, A. Leipertz
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Investigation of the Vaporization Process During Mixture Formation in a Direct-Injected Spray Using the Laser Induced Grating Technique. European Conference on nonlinear Optical Spectroscopy (ECONOS 2012), Aberdeen, United Kingdom, June 2012
B. Roshani, D. N. Kozlov, J. Kiefer, T. Seeger, A. Leipertz
