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Experimental Investigation of Crescent-Shaped Jets in Crossflow

Borhani Jahromi, Javad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55835 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Kebriaee, Azadeh; Taiebi Rahni, Mohammad
  7. Abstract:
  8. In this thesis, the physics related to liquid jet injection from injectors with three different crescent-shaped cross-sectional levels into steady and transverse flow were studied. The imaging method in this research was based on shadowgraph, which enables high-speed imaging. With the help of the obtained images, the breakup regimes, including Rayleigh, first and second wind-induced instabilities, were observed for injection into the steady flow. Furthermore, breakup regimes for jet injection into transverse flow, including columnar, columnar-bag, and bag, were also observed. The characteristics of the breakup height in steady flow and the length and height of the breakup along with the jet path in transverse flow were investigated. During these studies, empirical relationships were obtained for the mentioned characteristics in transverse flow in terms of dimensionless numbers, including the Reynolds and momentum ratios, which were also verified with the data. It was observed that the jet path is independent of the Reynolds number and only depends on the momentum ratio. On the other hand, the breakup height and jet penetration in flow are independent of the Reynolds number and only depend on the momentum ratio, having a direct relationship with it, causing a delay in the bending of the jet with an increase in penetration depth. By increasing the momentum ratio, in addition to increasing penetration depth, the size of droplets and ligaments decreases. The length of breakup is also independent of both the Reynolds number and the momentum ratio and can be considered a constant value
  9. Keywords:
  10. Experimental Investigation ; Two Phase Flow ; Flow Visualization ; Waterjet ; Cross Flow ; Crescent-Shaped Injector ; Constant Current

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