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Atomization and Sprays

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ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v3.i2.60
pages 203-221


Tsung-Leo Jiang
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan 70101 ROC
Huei-Huang Chiu
Institute of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan,70101, ROC


The present spray combustion computation studies numerically the effects of spray angles and injected droplet sites on the combustion efficiency and combustion modes of a cylindrical, nonpremixed combustor through implementation of a realistic droplet combustion model. Combustion efficiency increases with increasing spray cone angle, achieving a maximum value at an optimal injected mean droplet size. The predicted combustion modes indicate that fuel is consumed by the complementary processes of droplet and gas-phase combustion, and are significantly influenced by both spray cone angle and injected mean droplet size. Two flame patterns are identified based on injected droplet size. Small droplet spray is characterized by a diffusion flame separating the fuel and air streams, while large droplet spray exhibits intense mixed droplet and gas-phase combustion near the combustor watt. The results show that combustion efficiency for the former and latter increases and decreases, respectively, with increasing injected droplet sizes. The optimal injected droplet size is therefore suggested to occur at the transition between these two flame patterns.