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Full-Text Articles in Mechanical Engineering
Computational Scheme Guided Design Of A Hybrid Mild Gasifier, You Lu
Computational Scheme Guided Design Of A Hybrid Mild Gasifier, You Lu
University of New Orleans Theses and Dissertations
A mild gasification method has been developed to provide an innovative clean coal technology. The objectives of this study are to (a) incorporate a fixed rate devolatilization model into the existing 2D multiphase reaction model, (b) expand the 2D model to 3D and (c) utilize the improved model to investigate the mild-gasification process and guide modification of the mild-gasifier design. The Eulerain-Eulerian method is employed to calculate both the primary phase (air) and secondary phase (coal particles). The improved 3D simulation model, incorporated with a devolatilization model, has been successfully developed and employed to determine the appropriate draft tube dimensions, …
An Investigation Of Mist/Air Film Cooling With Application To Gas Turbine Airfoils, Lei Zhao
An Investigation Of Mist/Air Film Cooling With Application To Gas Turbine Airfoils, Lei Zhao
University of New Orleans Theses and Dissertations
Film cooling is a cooling technique widely used in high-performance gas turbines
to protect turbine airfoils from being damaged by hot flue gases. Film injection holes are
placed in the body of the airfoil to allow coolant to pass from the internal cavity to the
external surface. The ejection of coolant gas results in a layer or “film” of coolant gas
flowing along the external surface of the airfoil.
In this study, a new cooling scheme, mist/air film cooling is proposed and
investigated through experiments. Small amount of tiny water droplets with an average
diameter about 7 μm (mist) is …