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Atomization and Sprays

Published 12 issues per year

ISSN Print: 1044-5110

ISSN Online: 1936-2684

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EXPERIMENTAL STUDY OF SPRAY BREAKUP PHENOMENA IN SMALL-SCALE SIMPLEX ATOMIZERS WITH AND WITHOUT AIR SWIRL

Volume 28, Issue 4, 2018, pp. 299-320
DOI: 10.1615/AtomizSpr.2018021190
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ABSTRACT

Spray breakup processes of small-scale simplex atomizers have been characterized. With tangential entry of fuel, the cases of no air flow and concentric co-swirl air flow are considered. Ten simplex atomizers with different values of dimensionless tangential port area K have been employed. The breakup mode changes from film breakup to jet breakup, with increase in K value. For small K values, small port area causes high liquid swirl, which aids in the formation of an air core and a hollow cone spray with large cone angle. At high K values, jet breakup gives rise to a full cone spray with a small cone angle. The Sauter Mean Diameter (SMD) for the spray exhibits bimodal variation in the radial direction close to the atomizer. Based on a large volume of data for kerosene and water sprays, accurate correlations (covering wide operating conditions) have been developed for the spray cone angle, Cd, and axial variation of SMD for small-scale simplex atomizers. Swirl air interaction with the liquid film causes a transition from closed tulip shape to an open spray at a critical air flow rate. The critical air flow rate for transition is initial condition-dependent and it exhibits hysteresis.

CITED BY
  1. Ghate Kushal, Sundararajan Thirumalachari, Effects of orifice divergence on hollow cone spray at low injection pressures, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 233, 11, 2019. Crossref

  2. Sharma Shraddha, Ghate Kushal, Sundararajan Thirumalachari, Sahu Srikrishna, Effects of air swirler geometry on air and spray droplet interactions in a spray chamber, Advances in Mechanical Engineering, 11, 5, 2019. Crossref

  3. Wang Jiayuan, Zhou Gang, Wei Xing, Wang Shicong, Experimental characterization of multi-nozzle atomization interference for dust reduction between hydraulic supports at a fully mechanized coal mining face, Environmental Science and Pollution Research, 26, 10, 2019. Crossref

  4. Muthuselvan Govindaraj, Suryanarayana Rao Muralidhara, Iyengar Venkat S., Pulumathi Manjunath, Thirumalachari Sundararajan, K Srinivasan, Effect of Atomization Quality on Lean Blow-Out Limits and Acoustic Oscillations in a Swirl Stabilized Burner, Combustion Science and Technology, 192, 6, 2020. Crossref

  5. Muthuselvan Govindaraj, Suryanarayana Rao Muralidhara, Iyengar Venkat S., Pulumathi Manjunath, Thirumalachari Sundararajan, Srinivasan K, Effect of Lean Primary-Zone Operation on Emissions and Stability of Non-Premixed Combustors, Journal of Propulsion and Power, 37, 1, 2021. Crossref

  6. Chen Chongchong, Li Shougen, Wu Xiaoyi, Zheng Yongjun, Wang Yaxiong, Kang Feng, Construction of a theoretical model for fan nozzles with precise atomization angles for plant protection, Chemosphere, 287, 2022. Crossref

  7. Schiavo E. Lo, Laera D., Riber E., Gicquel L., Poinsot T., On the impact of fuel injection angle in Euler–Lagrange large eddy simulations of swirling spray flames exhibiting thermoacoustic instabilities, Combustion and Flame, 227, 2021. Crossref

  8. Vignat Guillaume, Rajendram Soundararajan Preethi, Durox Daniel, Vié Aymeric, Renaud Antoine, Candel Sébastien, A Joint Experimental and Large Eddy Simulation Characterization of the Liquid Fuel Spray in a Swirl Injector, Journal of Engineering for Gas Turbines and Power, 143, 8, 2021. Crossref

  9. Gad H.M., Baraya E.A., Farag T.M., Ibrahim I.A., Effect of geometric parameters on spray characteristics of air assisted pressure swirl atomizer, Alexandria Engineering Journal, 61, 7, 2022. Crossref

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