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http://dx.doi.org/10.3795/KSME-B.2013.37.7.675

Cumulative Distributions and Flow Structure of Two-Passage Shear Coaxial Injector with Various Gas Injection Ratio  

Lee, Inchul (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.)
Kim, Dohun (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.)
Koo, Jaye (School of Aerospace and Mechanical Engineering, Korea Aerospace Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.7, 2013 , pp. 675-682 More about this Journal
Abstract
To verify the effect of inner- and outer-stage gas jets, a shear coaxial injector was designed to analyze the axial velocity profile and breakup phenomenon with an increase in the measurement distance. When the measurement position was increased to Z/d=100, the axial flow showed a fully developed shape due to the momentum transfer, aerodynamic drag effect, and viscous mixing. An inner gas injection, which induces a higher momentum flux ratio near the nozzle, produces the greater shear force on atomization than an outer gas injection. Inner- and Outer-stage gas injection do not affect the mixing between the inner and outer gas flow below Z/d=5. The experiment results showed that the main effect of liquid jet breakup was governed by the gas jet of an inner stage. As the nozzle exit of the outer-stage was located far from the liquid column, shear force and turbulence breaking up of the liquid jets do not fully affect the liquid column. In the case of an inner-stage gas injection momentum flux ratio within 0.84, with the increase in the outer gas momentum flux ratio, the SMD decreases. However, at an inner-stage gas jet momentum flux ratio over 1.38, the SMD shows the similar distribution.
Keywords
Shear Coaxial Injector; Multi Gas Injection; Axial Velocity; Breakup; Cumulative Distribution; Droplet Size;
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