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 12 of 12 for “"Combustion diagnostics"”.
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Multi-dimensional Flow and Combustion Diagnostics
… transient in time. Therefore, multidimensional diagnostics that are capable of resolving such spatial and temporal dynamics have long been desired; and the purpose of this dissertation is to investigate three such diagnostics both for the fundamental study of flow and combustion processes and …
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Novel diode laser absorption techniques for combustion diagnostics
… measurement of particulate matter formation in combustion processes. A novel simple approach using a modulated continuous wave diode laser is presented in this thesis. The measurements taken using this new technique are compared to measurements of the visible emission from the flame, and …
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Spray combustion diagnostics with tracer-based laser-induced fluorescence imaging
Um die Vorgänge bei der Verbrennung in modernen Motorentypen, wie z.B dem direkteinspritzenden Benzinmotor, besser verstehen und optimieren zu können, haben sich in den letzten Jahren berührungsfreie, laserbasierte Diagnostik-Methoden als besonders vielseitig und hilfreich erwiesen. Die meisten …
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Development of Laser-Spectroscopic Techniques for New Detection Schemes in Combustion Diagnostics
… spectroscopy (PS) to probe species relevant to combustion. The CH radical was studied in a low-pressure methane/oxygen flame and compared with laser-induced fluorescence (LIF) measurements acquired simultaneously. Atomic hydrogen was imaged at ambient pressure in a hydrogen/oxygen flame, …
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Combustion diagnostics in Homogeneous Charge Compression Ignition optical and thermal single cylinder engines
… strategy and timing on autoignition and combustion characteristics of a Homogeneous Charge Compression Ignition (HCCI) engine with a negative valve overlap (NVO) strategy. Conventional (pressure-transducer based) measurements and passive optical research have contributed to understanding …
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Ionization In Diesel Combustion For On-Board Diagnostics And Engine Control
… goals, there is a need for the control of the combustion process to reduce engine-out emissions in real-time and reduce the demand on the after-treatment devices. This requires a signal indicative of the in-cylinder conditions to be fed in the ECU (Engine Control Unit). The most promising …
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Investigation of Endoscopic Techniques for Flow and Combustion Measurements
… application of fiber-based endoscopes (FBEs) in combustion and flow measurements, especially for multidimensional and quantitative measurements. The use of FBEs offers several unique advantages to greatly reduce the implementation difficulty and cost of optical diagnostics. However, the use of …
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Development of Multi-perspective Diagnostics and Analysis Algorithms with Applications to Subsonic and Supersonic Combustors
… research needs for the study of hydrocarbon combustion in high speed flows: 1) combustion diagnostics with adequate temporal and spatial resolution, and 2) mathematical techniques that can extract key information from large datasets. The goal of this work is to address these needs, …
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Computational Modeling of Radiation Effects on Total Temperature Probes
… working on the development of superchargers and combustion diagnostics. A standard temperature sensor for high temperature applications was and remains to be the thermocouple. However, this sensor is characterized by errors due to conduction heat transfer from the sensing element, as well as …
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An Experimental Investigation of Self-Excited Combustion Dynamics in a Single Element Lean Direct Injection (LDI) Combustor
<p>The management of combustion dynamics in gas turbine combustors has become more challenging as strict NOx/CO emission standards have led to engine operation in a narrow, lean regime. While premixed or partially premixed combustor configurations such as the Lean Premixed Pre-vaporized (LPP), Rich …
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Laser Diagnostics Applied to Lean Premixed Swirling Flames - Simultaneous Flow Field and Scalar Measurements
The work reported here includes experimental studies of lean premixed swirling flames. Various laser-based optical diagnostic techniques were used to collect information under different operational conditions. Combined flow- and scalar field measurements were performed at high repetition rates for …
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In-situ, ταχεία και μη-διαταρακτική διαγνωστική διαδικασιών καύσης και των προϊόντων με φασματοσκοπία πλάσματος επαγόμενο από λέιζερ (LIBS)
Τα τελευταία χρόνια, η φασματοσκοπία πλάσματος επαγόμενο από λέιζερ (LIBS) έχει προσελκύσει μεγάλο ερευνητικό ενδιαφέρον καθώς αποτελεί μία πειραματικά απλή και αποτελεσματική τεχνική, η οποία παρέχει τη δυνατότητα λήψης μετρήσεων για απευθείας ποιοτική και ποσοτική στοιχειακή ανάλυση. Η τεχνική …