Study On The Laser Dropsizing Of Kerosene Injected Into A Supersonic Aristream By PLIF/Mie Dual Spectrum

In this dissertation, a new measurement of laser dropsizing of kerosene injected into a supersonic aristream by dual spectrum is studied. Scramjet is the primary key technology of hypersonic aircraft. It’s one of the leading edge of the world. It is the key issues that kerosene’s supersonic atomization for the development of scramjet. But the jet breakup and atomization is one of the most difficult and unresolved problems of hydrodynamics. It’s challenging for the study of kerosene’s supersonic atomization, combustion phenomena and particle size measurement. Although the issue has been studied extensively, a new-online measurement of particle size distribution is to be developed to provide the basis and data for the design and evaluation of kerosene scramjet combustion chamber. At present, the theory and simulation approaches are not well resolved. It still relys on experimental measurements. Currently, the available measurement of particle size includes schlieren/shadow spray, particle phase Doppler measurements (PDA/PDPA), light scattering and laser holography. Schlieren optics and shadows are suitable for displaying fine structure of the flow field of the wave. But the resolution is low, and there are points along the optical path effect. Therefore, it’s not suitable for the study of liquid jets crushing and mixing phenomena. The two-dimensional particle size distribution measurement results can be given by holographic, but there are points along the optical path effects, and the data volume efficiency is low. PDPA’s optical path is complexity, expensive, and needs high requirements for the testing environment. It is difficult to fit the engine and the large supersonic wind tunnel and other real measurement environment. Spectral/scattered light imaging technology is developed quickly in latest10years. It is efficiency, easy and informative features. These measurements have their own advantages as well as drawbacks, but they do not apply to the complex field of on-line measurement of ultrasonic atomization particle size distribution. A new measurement is needed.In this dissertation, a new measurement is studied. Firstly, the theoretical principle of the measurement method is given. The aerosol laboratory bench experiments to validate the calibration method and system theory are discussed. And f the experiment is completed. With analysis of the experimental data, the feasibility of the method is confirmed. This article also discusses the experimental method steps and precautions stage supersonic wind tunnel experiments, experiments must be designed experiments segment and optical layout scheme. Mechanical portion and the quartz glass observation window of the test section have been completed.For some kinds of reasons, the experiment is not perfect. A lot of details are to be improved and perfected. The conclusions and views need more experimental images and data validation.