Pressure Gain Combustion: Fuel Spray and Shockwave Interaction
PhD Thesis
Authors | Onwuegbu, S. |
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Type | PhD Thesis |
Qualification name | PhD (Traditional) |
Abstract | Pressure gain combustion can attain higher thermodynamic cycle efficiency in gas turbine power systems, resulting in the reduction of specific fuel consumption/fuel burn and Carbon dioxide emissions.There are many ways to achieve pressure gain and the present research investigates pressure gain through shock bubble (gas and liquid bubble) interaction (SBI) using computational fluid dynamics (CFD) simulations. The numerical simulations have been performed in 2D and 3D representations of the shock tube to depict the interaction of a planar shock wave with distinct gas and liquid inhomogeneities. The three scenarios considered cover the interaction of a planar shock wave in air with: spherical helium bubble (Mach number, Ma = 1.25); cylindrical helium bubble (Ma = 1.22) and cylindrical water bubble (Ma = 1.47). To perform these simulations, the Unsteady Reynolds-Averaged Navier-Stokes (URANS) mathematical model and the coupled level set and VOF method within the commercial CFD code, ANSYS FLUENT, have been applied. A finite volume method (FVM) is also employed to solve the governing equations. For the spherical and cylindrical gas bubble cases, various quantitative analyses are presented and compared to the experimental work of Haas and Sturtevant (1987). These include: refracted wave, transmitted wave, upstream interface, downstream interface, jet, vortex filament, non-dimensional bubble, and vortex velocities. The predicted non-dimensional |
Keywords | Computational fluid dynamics, Fluid dynamics, Flow instabilities, Flow visualization, Shock waves, Shock–bubble interaction; URANS; Level set and VOF; Vortex filament |
Year | 2024 |
Publisher | College of Science and Engineering, University of Derby |
Digital Object Identifier (DOI) | https://doi.org/10.48773/q5wyz |
File | License File Access Level Open |
Publication process dates | |
Deposited | 30 Apr 2024 |
https://repository.derby.ac.uk/item/q5wyz/pressure-gain-combustion-fuel-spray-and-shockwave-interaction
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New Updated Pressure Gain Combustion - Fuel Spray and Shockwave Interaction Thesis (Solomon Onwuegbu) with corrections.pdf | ||
License: CC BY-NC-ND 4.0 | ||
File access level: Open |
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