Search for dissertations about: "transient instability"
Showing result 16 - 20 of 41 swedish dissertations containing the words transient instability.
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16. Modelling and Numerical Analysis of the Centrifugal Compressor and its Operation in the Pressurised SOFC GT Process
Abstract : Small-scale power plants based on the SOFC-GT (Solid Oxide Fuel Cell-Gas Turbine) system are foreseen for future application such as APU units in flight transportation systems or stationary power production. Although these new systems offer high load flexibility and potentially high efficiency, there are several constraints referring to thermal/mechanical stress of the fuel cell as well as to a potential risk of aerodynamic instability of the GT compressor due to the different physical behavior of the SOFC and the GT. READ MORE
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17. Linear and non-linear dynamics of non-autonomous flows
Abstract : Fluid flows subject to time-dependent external forces or boundary conditions are ubiquitous in biology and technical applications. Whether one considers birds flying by flapping their wings or the gust response of wind turbines, the flow is non-autonomous. READ MORE
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18. Experiments on oblique transition in wall bounded shear flows
Abstract : This thesis considers laminar-turbulent transition in wall bounded shear flows, with a focus on transition emanating from a pair of oblique disturbance waves. The oblique waves interact nonlinearly and transfers disturbance energy into streamwise vortices, which generate streamwise streaks through a linear mechanism that operates also at conditions where stability theory predicts decay of all eigenmodes. READ MORE
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19. The immune response in atherosclerosis and acute coronary syndromes
Abstract : The immune system is involved in the process of atherogenesis from the earliest steps of plaque formation, throughout the progression to the mature plaque, and finally in plaque complication and clinical manifestation of plaque instability. The present study has explored the role of specific immunity in relation to clinical instability of human coronary atherosclerosis and in experimental models of atherogenesis. READ MORE
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20. Receptivity, Stability and Sensitivity analysis of two- and three-dimensional flows
Abstract : This work deals with various aspects of boundary-layer stability. Modal and non-modal approaches are first used in the study of the global stability of a jet in crossflow. READ MORE