    Lean direct injection (LDI) combustion is one of the promising low pollution combustion technologies. One challenge of implementing LDI combustion is to achieve quick fuel-atomizing and mixing with air. In this paper, the spray characteristics and the prompt atomization process of the tangentially injected prefilming (TIP) LDI injector are investigated by experiments; the energy transmission model during the prompt atomization process and the semi-empirical estimation model of SMD for the conical liquid film are derived. All experiments were carried out under 20◦C and atmospheric pressure by using kerosene as the fuel. Firstly, effects of We and ALR on the spray distribution and SMD were studied by experiments, which were carried out at the operating conditions of We 664–2656 and ALR 16.3–24.5. The spray distribution and SMD were measured by Mie scattering and Malvern spraytec laser diffraction system respectively. Results showed that large We is beneficial to distribute the spray in primary zone downstream the swirler. Then breakup regimes of liquid film and droplets’ evolution were captured by a high-speed camera with a long-distance microscope (LDM). Results showed the primary atomization process conforms to the prompt atomization mechanism, which does not rely on the surface waves anymore. Finally, the energy transmission of the conical liquid film during the atomization process was analyzed, and the semi-empirical estimation model of SMD was derived. The calculated and the measured SMD have good consistency, which demonstrates the applicability of the prompt atomization energy transmission model on a conical liquid film.


Prompt Atomization Mechanism of the Tangentially Injected Prefilming (TIP) LDI Injector

Division / Sponsor:
International Gas Turbine Institute (IGTI)

Paper Proceedings: https://asmedigitalcollection.asme.org/GT/GT2020/volume/84058

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