Time-Resolved Simultaneous Determination of Local Temperature and Species Concentration in Liquid Petrol Gas Injection Using Laser-Induced Gratings

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In the project the laser-induced gratings (LIGs) technique will be utilized to accomplish simultaneous spatially- and temporally-resolved measurements of temperature and species concentration. In the past the technique has been used to determine temperatures at known concentrations and the other way round. In preliminary investigations in collaboration with Dr. D.N. Kozlov (A.M. Prokhorov General Physics Institute, Russian Academy of Sciences) in the framework of a 6 month DFG project the applicants could show that the method has the potential to derive both parameters in binary mixtures at the same time. The corresponding report is attached and in the following it will be referred to. The objective of this project is a detailed experimental and theoretical study of the potential and the applicability of the mentioned measurement technique as related to simultaneous determination of temperature, fuel-air ratio, and flow velocity in investigations of the mixture formation process during pressurized fuel injection. These studies are necessary to make this promising method available in future works for this kind of application. Within the first and second years the focal point will be laid on the development of the LIGs technique for temperature and concentration measurements. Besides the experimental investigation of the technique further development and improvement of the theoretical calculations and data evaluation procedures, that take into account physical mechanisms involved, is required. The results obtained using LIGs will be verified by coherent anti-Stokes Raman spectroscopy (CARS), which is well established at the LTT. During the third year measurements of fuel flow velocity inside the injection chamber are planned. Within this project the developed methods will be demonstrated and tested in a laboratory pressurized fuel injection system. The experimental and theoretical work will be conducted in close cooperation with Dr. D.N. Kozlov and his co-workers in the GPI. This will ensure fast progress since they have long-time experience and knowledge regarding laser-induced gratings and nonlinear spectroscopy.