Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 7 of 7 for “"Low-order modelling"”.
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Aerothermal Sentencing for Manufacturing Variations on Turbine Blade Shrouds
… height forward-facing step, as perceived by the flow in the aftchord region, are studied. The gap widths is varied from the nominal value by both an increase and reduction with 1σ. This study shows that the shroud endwall flow is aligned with the wedge face until midchord and crosses the step in …
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Modelling and analysis of nonlinear thermoacoustic systems using frequency and time domain methods
In this thesis, low-order nonlinear models for the prediction of the nonlinear behaviour of thermoacoustic systems are developed. These models are based on thermoacoustic networks, in which linear acoustics is combined with a nonlinear heat release model. The acoustic networks considered in this …
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Infrared Thermography Techniques for Flow Visualisation and Heat Transfer Coefficient Measurement
… improvements. The aim of this thesis is to use a low-order modelling approach to analyse IR methods and identify routes for optimisations. Flow visualisation with IR uses the change in surface temperature that occurs at a change in boundary layer state due to changes in heat transfer coefficient …
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Ignition and propagation mechanisms of spray flames
… the flame, evaluated from OH* visualisation, allowing for a distinction between the phases of kernel generation and flame growth. Based on the critical time scale, ignition failure time scales can be measured, as well as kernel sizes conditional on ignition or failure. Small kernels typically …
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Towards a silent fan: an investigation of low-speed fan aeroacoustics
… linked to the aerodynamic features of the flow field. In this work, the aeroacoustics of low-speed fans are investigated using a compact mixed-flow fan as a test case. The low-speed regime is less developed compared to large-scale, high-speed machines and is increasingly relevant to …
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Real-time data assimilation in nonlinear dynamical systems
… Central to digital twins are physics-based low-order models and experimental data. On the one hand, low-order models are computationally cheap, but they may be quantitatively inaccurate and contain model errors. On the other hand, experimental data can be quantitatively accurate, but they …
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Three-Dimensional Unsteady Hydrodynamics of Tidal Turbines
… fluctuating loads that result from the unsteady flow, either from high-cycle fatigue or from extreme loading events exceeding the ultimate tensile strength of components. In this thesis, the problem of unsteady loading is addressed by identifying the shortcomings of the models currently used to …