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Endoscopic Fiber-Based Chemiluminescence Diagnostics in Real-Scale High-Pressure Gas Turbine Combustor Test Rigs
The combustion system of modern gas turbines has to meet a large number of requirements, diametrically opposed in some cases, and are therefore intensely investigated in elaborate highpressure tests. The associated effort and costs are immense; thus it is desired to achieve the highest possible information density during each test. The optical measurement techniques used to date to increase information density are regularly based on optical access to the combustion chamber by means of rigid probes, which were specifically designed for each specific application and are therefore difficult to apply to different test rigs and difficult to adapt to other measurement methods. Consequently, in this thesis a modular, fiber-based flexible endoscopic probe was developed to enable optical access to various test rig configurations, allowing for a more frequent use of optical measurement techniques. Due to its robustness and simplicity, chemiluminescence imaging was selected as optical measurement technique and the probe developed on this basis. The probe has been successfully operated on consecutive days at pressures up to 1.6 MPa and temperatures of 750 K at air mass flow rates of 32.5 kg/s. As a result of the modular design concept, the probe was also successfully utilized in wall temperature measurements in studies by Nau et al. Chemiluminescence imaging measurements were carried out at three different test rigs, namely the NDP-1, the HBK-4, and the CEC under atmospheric (NDP-1) or high-pressure conditions. For each measurement, the signal was filtered for OH* or CH* , respectively, via the correspondding band-pass filters. Some measurements were directed at investigating the flame length and flame position inside the combustion chamber. For this purpose, a post-processing routine was developed to identify the flame within the recorded chemiluminescence images, combining the thresholding method developed by Otsu with calculations of the image entropy to identify the optimal threshold that most accurately characterizes ...
Endoscopic Fiber-Based Chemiluminescence Diagnostics in Real-Scale High-Pressure Gas Turbine Combustor Test Rigs
The combustion system of modern gas turbines has to meet a large number of requirements, diametrically opposed in some cases, and are therefore intensely investigated in elaborate highpressure tests. The associated effort and costs are immense; thus it is desired to achieve the highest possible information density during each test. The optical measurement techniques used to date to increase information density are regularly based on optical access to the combustion chamber by means of rigid probes, which were specifically designed for each specific application and are therefore difficult to apply to different test rigs and difficult to adapt to other measurement methods. Consequently, in this thesis a modular, fiber-based flexible endoscopic probe was developed to enable optical access to various test rig configurations, allowing for a more frequent use of optical measurement techniques. Due to its robustness and simplicity, chemiluminescence imaging was selected as optical measurement technique and the probe developed on this basis. The probe has been successfully operated on consecutive days at pressures up to 1.6 MPa and temperatures of 750 K at air mass flow rates of 32.5 kg/s. As a result of the modular design concept, the probe was also successfully utilized in wall temperature measurements in studies by Nau et al. Chemiluminescence imaging measurements were carried out at three different test rigs, namely the NDP-1, the HBK-4, and the CEC under atmospheric (NDP-1) or high-pressure conditions. For each measurement, the signal was filtered for OH* or CH* , respectively, via the correspondding band-pass filters. Some measurements were directed at investigating the flame length and flame position inside the combustion chamber. For this purpose, a post-processing routine was developed to identify the flame within the recorded chemiluminescence images, combining the thresholding method developed by Otsu with calculations of the image entropy to identify the optimal threshold that most accurately characterizes ...
Endoscopic Fiber-Based Chemiluminescence Diagnostics in Real-Scale High-Pressure Gas Turbine Combustor Test Rigs
Görs, Simon (author) / Schulz, Christof
2023-04-20
Theses
Electronic Resource
English
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