The atomization and evaporation of liquid fuels is a crucial process for the development of aero engine combustion chambers, and atomization is the basis for evaporation. The future development trend of advanced aero-engine combustion chambers is that high-temperature rising or even ultra-high-temperature rising combustion of military aircrafts and low-pollution combustion of civil aircraft pose new challenges and requirements for combustion chamber design. One of the most critical factors influencing the combustion performance is the fuel atomization process, which has a decisive influence on the key properties of the combustion chamber such as ground start ignition, high altitude re-ignition, combustion stability, pollutant emission and outlet temperature distribution.
At present, the domestic commercial large aircraft and the next-generation military aeroengine pose a need for a combined air nozzle. However, in China, there is lack of an atomization test bench for simulating the high-pressure and high-temperature environment in an engine combustion chamber. The Institute of Engineering Thermophysics of the Chinese Academy of Sciences has the only domestic atomization. Characteristics of the plane laser measurement platform, but only in the normal temperature and pressure combustion chamber carried out a lot of research, the urgent need to improve the atomization characteristics of the plane laser imaging testing technology in the engine combustion chamber for advanced classification / partitioned modular air atomizing nozzle Atomization mechanism research and application development.
Based on the research and development needs of advanced aeroengines new combustion technology and the problems in atomization research, the Light Power Center of the Engineering Thermophysics Center utilizes the hardware experimental conditions of the Langfang Research and Development Center to design and simulate high-pressure and high-temperature atomization environments in the engine combustion chamber and can perform optical The measurement of the combustion chamber test piece provides a test environment for the study of the high-temperature and high-pressure atomization characteristics of the fuel nozzle; then, it improves the hardware level of the planar laser measurement coefficient of the atomization characteristics of the normal temperature and pressure, and according to the measurement characteristics and difficulties of the high-temperature and high-pressure atomization characteristics, The design is applicable to the experimental scheme and image post-processing scheme for fuel space distribution measurement, particle size measurement and calibration in high-temperature and high-pressure combustion chambers; based on these two aspects, the application level of planar laser measurement technology in the engine combustion chamber is improved.
At present, the researchers have completed the design and demonstration of the planar laser imaging measurement system for atomization characteristics, the transformation of laboratory supporting devices, and the design, processing, installation, and commissioning of high-temperature, high-pressure optical visible combustion chamber test parts, and achieved experimental state parameters. Design goals. In the optical measurement of the high-temperature and high-pressure atomization characteristics, the measurement of the flow field and fuel space distribution under the experimental conditions of high temperature and high pressure in a real combustion chamber has been achieved, and the influence of pressure and temperature on the LIF signal intensity has been obtained. Research on Two Dimensional Particle Size Measurement Methods. Some research results have been published at the international conference ASME 2016 Turbo Expo.
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