Searched for: subject%3A%22Gas%255C%2BTurbines%22
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Daugulis, Edgars (author)
An accurate estimation of gas turbine nozzle guide vane metal temperature locally on its surface is crucial for predicting vane lifetime. The stagnation region at the vane leading edge is, typically, exposed to the highest thermal load, thus, the showerhead configuration of film cooling is often applied on the leading edge. Widely used lean-...
master thesis 2022
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Sachdeva, Naman (author)
The world is moving towards sustainability and there is immense pressure on Aerospace Industry to reduce its emissions to contribute to a carbon-neutral world. However, maturing gas turbine technology is a big bottleneck towards this goal and hence, this project focuses on the technical and economic feasibility of a new type of propulsion system...
master thesis 2022
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Zhou, Zheng (author)
Ammonia fuel has been widely considered as an attractive solution for reducing the green house gas emissions over recent years. Adapting ammonia as fuel on ships would highly reduce the carbon footprint of international shipping and off-shore transportation. Among the different systems currently under development for carbon-free power production...
master thesis 2021
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Zaky, Michael (author)
Gas turbines for power generation use lean premixed flames to adhere to the strict pollutant emissions regulations. Unfortunately, this often leads to thermoacoustic instabilities. These instabilities can lead to failure of system components, flame blow-off or flashback and a reduction in efficiency. Especially the high frequency transverse...
master thesis 2021
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Penmathsa, Akhil (author)
Flame flashback is a failure mode in the operation of lean premixed combustion system. Due to higher flame speeds and lower quenching distances, hydrogen-rich fuel mixtures are prone to boundary layer flashback (BLF), where mixture flow speeds are low compared to the local flow velocity. Research at TU Munich (Eichler 2011) has resulted in new...
master thesis 2021
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Nasiri, Ali (author), Bayat, Farhad (author), Mobayen, Saleh (author), Hossein Nia Kani, S.H. (author)
An accurate understanding of the output power functionality in gas turbines concerning the fuel, inlet valve status and other parameters can provide a general overview of the turbine's performance. In this study, the problem of practical power regulation in gas turbines is investigated in the simultaneous presence of actuator constraints,...
journal article 2021
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Arush, I. (author), Pavel, M.D. (author), Mulder, Max (author)
The process of empirical models evaluation is at the core business of experimental flight-testing data analysis. Accurate and convenient flight-testing of helicopter engine(s) available power is crucial for predicting the total helicopter performance. Common practice in estimation of in-flight helicopter gas turbine engine power consists of a...
journal article 2020
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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
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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
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Rajabinezhad, Mojtaba (author), Bahrami, Abbas (author), Mousavinia, Mohammad (author), Seyedi, Seyed Jalil (author), Taheri, P. (author)
This paper investigates the root cause of a failure in gas-turbine blades, made of Nimonic-105 nickel-based superalloy. The failure was reported in two blades in the second stage of a turbine-compressor of a gas turbine in the hot section. Two failed blades were broken from the root and from the airfoil. The failure took place after 20 k h of...
journal article 2020
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Röell, Bastiaan (author)
After maintenance, turbofan engines are subjected to a performance acceptance test in an indoor test-cell to demonstrate that corrected performance thresholds are met. The same indicators are also monitored after on-wing installation. Despite corrections for operation conditions, differences are observed between test-cell and subsequent on-wing...
master thesis 2019
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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
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Saba, Youssef (author)
As the energy transition evolves, more fossil-driven base-load generation is being replaced with intermittent renewable energy sources. Peak power plants will continue to play a crucial role in future renewable energy systems to complement renewable energy supply. The focus of this thesis is on alternative fuels that can be utilized in...
master thesis 2019
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van Haren, Eduard (author)
The turbulent lifted Dutch natural gas jet diffusion flame in cold co-flowing air is widely used in gas turbine operation and subject of the current investigation. In striving to clean and sustainable combustion, adding hydrogen to the Dutch natural gas (DNG) fuel and CO2 in the coflow is promising. Objective of this investigation is to study...
master thesis 2019
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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
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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
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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
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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
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Tacconi, Jacopo (author)
Current unmanned aerial vehicles (UAVs) are limited in operating altitude and endurance by the maximum attainable performance of small gas turbine engines. While improvements in the cycle thermal efficiency can be obtained through the introduction of heat exchangers, the consequent increase in engine weight partially offsets the benefits gained...
master thesis 2018
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Regueiro Cueva, Juan (author)
Range extended electric vehicles (REEV) are being considered as a possible solution for the electrification of passenger vehicles. The application of a recuperated gas turbine (GT) for REEVs shows potential in terms of power-to-weight ratio, emissions and cost. The recuperator plays a major role in achieving target efficiency, while being a main...
master thesis 2018
Searched for: subject%3A%22Gas%255C%2BTurbines%22
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