2024-03-28T10:27:48Zhttps://keep.lib.asu.edu/oai/requestoai:keep.lib.asu.edu:node-1519442021-08-30T18:39:12Zoai_pmh:all151944
https://hdl.handle.net/2286/R.I.18119
http://rightsstatements.org/vocab/InC/1.0/
All Rights Reserved
2013
xi, 86 p. : ill. (some col.)
Doctoral Dissertation
Academic theses
Text
eng
Ghods, Sina
Herrmann, Marcus
Squires, Kyle
Chen, Kangping
Huang, Huei-Ping
Tang, Wenbo
Arizona State University
Partial requirement for: Ph.D., Arizona State University, 2013
Includes bibliographical references (p. 83-86)
Field of study: Mechanical engineering
The atomization of a liquid jet by a high speed cross-flowing gas has many applications such as gas turbines and augmentors. The mechanisms by which the liquid jet initially breaks up, however, are not well understood. Experimental studies suggest the dependence of spray properties on operating conditions and nozzle geom- etry. Detailed numerical simulations can offer better understanding of the underlying physical mechanisms that lead to the breakup of the injected liquid jet. In this work, detailed numerical simulation results of turbulent liquid jets injected into turbulent gaseous cross flows for different density ratios is presented. A finite volume, balanced force fractional step flow solver to solve the Navier-Stokes equations is employed and coupled to a Refined Level Set Grid method to follow the phase interface. To enable the simulation of atomization of high density ratio fluids, we ensure discrete consistency between the solution of the conservative momentum equation and the level set based continuity equation by employing the Consistent Rescaled Momentum Transport (CRMT) method. The impact of different inflow jet boundary conditions on different jet properties including jet penetration is analyzed and results are compared to those obtained experimentally by Brown & McDonell(2006). In addition, instability analysis is performed to find the most dominant insta- bility mechanism that causes the liquid jet to breakup. Linear instability analysis is achieved using linear theories for Rayleigh-Taylor and Kelvin- Helmholtz instabilities and non-linear analysis is performed using our flow solver with different inflow jet boundary conditions.
Mechanical Engineering
Atomization
High Density Ratio
Instability Analysis
Jet In Crossflow
Multiphase Flows
Numerical Simulations
Multiphase flow
Turbulence
Detailed numerical simulation of liquid jet in crossflow atomization with high density ratios