Searched for: contributor%3A%22Klein%2C+Sikke+%28mentor%29%22
(1 - 17 of 17)
document
Dammers, Tim (author)
Lean premixed flames are being used in gas turbines to reduce the emission of NOx. Unfortunately, it results often in thermoacoustic instabilities. These instabilities are high amplitude pressure oscillations which cause damage to the combustion system, reduce efficiency, flame blow-off or flashback. While the cause for instabilities due to...
master thesis 2020
document
Kimman, Nick (author)
Fossil fuel based energy systems are the main contributor to global warming. As new regulations come into place, a transition towards a more sustainable energy system must be realised. Hydrogen usage is regarded as the key enabler of such systems. The heart of these hydrogen-based energy systems (HESs) is the hydrogen back-up system (HBS) which...
master thesis 2020
document
Voets, Roel (author)
With increasing discussion and legislation around emissions, gas turbines have evolved to limit their emissions, especially NOx emissions. The way of operating the gas turbine, with lean premixed combustion...
master thesis 2020
document
Faldella, Filippo (author)
Hydrogen combustion in gas turbines could play an important role in the future energy transition. However, the design of flexible gas turbine combustors able to operate with a wide range of Dutch Natural Gas (DNG) and hydrogen fuels is accompanied by new complex challenges. Small quenching distance, high burning velocity and propensity to...
master thesis 2020
document
Schouten, Bram (author)
Today’s renewables, wind and solar power, have a fluctuating nature, making the grid less stable.However, with the increasing share of intermittent sources of renewable power, novel options have to be created to stabilize the power grid. One of these options is energy storage via the conversion of excess power to hydrogen, during periods of high...
master thesis 2020
document
Arntzen, Stefan (author)
High-fidelity optimisation studies are a useful asset in the design of critical components for large gas turbines. These studies require the computation of numerous computationally expensive CFD simulations and result in predominantly optimisation graphs of design objectives (e.g. Pareto-front figure). The quantity of generated data is...
master thesis 2019
document
Björnsson, Olafur (author)
Flame flashback is an intrinsic problem in lean premixed combustion. Due to higher flame speeds and lower quenching distances, hydrogen-rich fuel mixtures are especially prone to boundary layer flashback (BLF). Research at TU Munich (Eichler 2011, Baumgartner 2014) has resulted in new insights into the mechanism of BLF, revealing a strong...
master thesis 2019
document
de Jongh, Reinout (author)
Restrictions on NOx emissions are increasingly stricter. In order to reduce the emissions of a gas turbine, manufacturers moved from diffusion-flames to lean premixed flames in their combustion process. However lean premixed flames are prone to (transverse) combustion instabilities. These instabilities consists of thermoacoustically driven...
master thesis 2019
document
Tober, Joeri (author)
A highly accurate model is presented that predicts boundary layer flashback (BLF) for lean premixed hydrogen combustion. In contrast to existing models, that fail for lean hydrogen mixtures, the present model includes the effect of flame instabilities. The model is applied to study the effect of burner geometry on flashback tendency. A diverging...
master thesis 2019
document
Tiemensma, Jelle (author)
Firing industrial installations, like boilers, with a cogeneration gas turbine instead of a classic burner have several beneficial aspects. A cogeneration system allows for a more efficient utilization of energy and lowered emissions. What makes such a system especially interesting is that the revenue of the generated electrical power can...
master thesis 2019
document
Ward, Keith (author)
This study examines Gas Path Analysis (GPA) as a method for the predictive maintenance of the Honeywell 331-500 Auxiliary Power Unit (APU). The 331-500 is used on the Boeing 777 and is susceptible to a sudden failure during operation due to the release of a first stage turbine blade. Investigations found the failure mechanisms of the blade...
master thesis 2018
document
van Deursen, Femke (author)
The increase in the share of renewable energy sources in the Dutch energy mix, requires an increase in flexibility from the power consumers and producers. A key issue in the availability of wind and solar power that it is independent of the power demand. Fortunately, the liberalised power market provides a financial incentive to increase both...
master thesis 2018
document
Dastagir, Abdulrahman (author)
The major challenges in the world today is to reduce pollutant emissions from gas turbines while still being able to retain the maximum efficiency in the gas turbine. Especially due to stringent norms on emissions, the research on gas turbines have increased to reduce NOx levels. Most of the gas turbines have been using non-premixed combustion...
master thesis 2018
document
Nannarone, Alessandro (author)
The rapid growth of renewable generation has modified the role of combined cycle power stations in the energy industry. Due to the strong increase of intermittent renewable sources, (solar, wind) the key feature for the operational excellence of combined cycle power stations is flexibility. In particular, the capability to start an installation...
master thesis 2017
document
De Francesco, Luca (author)
The increasing share of renewables in power production is demanding conventional plants to take on additional tasks. It is estimated that the cyclical and unpredictable nature of renewables will create under- and over-capacity periods that the system will need to accommodate. Given their wider load range and faster load changes, combined cycles...
master thesis 2017
document
Sridharan, Balaji (author)
The transition from a fossil based economy to a greener, bio-based economy remains challenged by the gap in technological maturity between bio-based processes and conventional fossil energy. Decreasing the price difference between fossil fuels and bio-fuels remains a major constraint. With 98% of the transportation sector now depending on fossil...
master thesis 2017
document
Schöffer, Samuel (author)
New technologies are being developed to produce electricity cleaner and more efficient. A promising technology among these is the solid oxide fuel cell (SOFC). It electrochemically converts chemical energy into electricity. This process is highly efficient and several types of fuel are suitable. Furthermore, the SOFC operates at a high...
master thesis 2017
Searched for: contributor%3A%22Klein%2C+Sikke+%28mentor%29%22
(1 - 17 of 17)