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Full-Text Articles in Mechanical Engineering
Direct Numerical Simulation Of Supercritical Co2 Mixing And Combustion, Syed Mohammad Ovais
Direct Numerical Simulation Of Supercritical Co2 Mixing And Combustion, Syed Mohammad Ovais
All Dissertations
The supercritical CO2 power cycle (sCO2 ) is a relatively new technology, which promises to reduce CO2 emissions with potentially higher efficiencies. However due to challenging conditions posed by supercritical pressures, the mixing and ignition phenomena in sCO2 combustion is relatively less understood and studied. The primary objective of the current study is to investigate these fundamental processes using homogeneous ignition calculations (HMI) and direct numerical simulations (DNS). Broadly, the study is divided into two major parts. In the first part supercritical mixing in sCO2 relevant conditions is investigated. To achieve this, DNS of temporally …
Numerical Studies On Supersonic Mixing And Combustion Phenomena, Tarek M. Abdel-Salam
Numerical Studies On Supersonic Mixing And Combustion Phenomena, Tarek M. Abdel-Salam
Mechanical & Aerospace Engineering Theses & Dissertations
A numerical study is conducted to investigate the mixing, combustion, and flow characteristics of different scramjet-combustor configurations. Three-dimensional models for the combustors have been used. Numerical results are obtained using a finite volume computational fluid dynamics (CFD) code with unstructured grids with sizes between 200,000 and 400,000 cells.
In the first part of the current study, the effects of the side angle of the fuel injectors in both mixing and combustion processes are investigated. Raised (compression) and relieved (expansion) wall-mounted ramps are used with side angles of 0 (unswept), 5, and 10 degrees. Results are obtained for nonreacting flows as …