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SWIRL ORIENTATION EFFECT ON THE INSTABILITY AND THE BREAKUP OF ANNULAR LIQUID SHEETS

ABU-NABAH, BASSAM ABDEL-JABER
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060978117

Abstract Details

2003, MS, University of Cincinnati, Engineering : Mechanical Engineering.
Atomizers are widely used for fuel injection in aircraft engines and gas turbine power plants. Improvement in fuel atomization can lead to the reduction of pollutant emissions resulting from the fuel combustion such as NOx gases. Air-blast atomizers provide excellent atomization over a large range of fuel flow rates and very good patternation. Therefore, such atomizers are being used in new generation of gas turbine combustors. However, the underlying physics of the air-blast atomization phenomena is not well understood. In this study we consider an annular liquid sheet emanating from an air-blast atomizer subjected to inner and outer swirling air streams. The dimensionless dispersion equation that governs the instability of an invisid annular liquid sheet under swirling air streams is derived. Numerical solutions to the dispersion equation under a wide range of flow conditions are carried out to investigate the effects of the liquid-gas swirling orientation (i.e. co-inner and co-outer swirl, co-inner and counter-outer swirl, counter-inner, co-outer swirl, and counter-inner and counter-outer swirl) on the maximum growth rate and its corresponding unstable wave number. The variations of specific effects of the gas to liquid density ratio, and film geometry (film thickness and surface curvature) on the instability of the liquid sheet are investigated. The model is validated using the available experimental data in literature. This study provides an improved understanding of atomization process and the results will help in improving atomizer designs.
Dr. Milind Jog (Advisor)
111 p.
instability; breakup; air blast atomizer; atomization; liquid sheet

Recommended Citations

Citations

  • ABU-NABAH, B. A.-J. (2003). SWIRL ORIENTATION EFFECT ON THE INSTABILITY AND THE BREAKUP OF ANNULAR LIQUID SHEETS [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060978117

    APA Style (7th edition)

  • ABU-NABAH, BASSAM. SWIRL ORIENTATION EFFECT ON THE INSTABILITY AND THE BREAKUP OF ANNULAR LIQUID SHEETS. 2003. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060978117.

    MLA Style (8th edition)

  • ABU-NABAH, BASSAM. "SWIRL ORIENTATION EFFECT ON THE INSTABILITY AND THE BREAKUP OF ANNULAR LIQUID SHEETS." Master's thesis, University of Cincinnati, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1060978117

    Chicago Manual of Style (17th edition)

ucin1060978117
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© 2003, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.
Release 3.2.12