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.
Results
Showing 1 to 14 of 14 for “"phase doppler anemometry"”.
-
Measurement of properties of gas-solid suspensions using phase-Doppler anemometry
… along vertical and horizontal diameters using Phase Doppler Anemometry which was a nonintrusive technique that measured the size and velocity of particles within the suspension flow. Phase Doppler Anemometry was used to determine flow properties that depended on the density of the particle …
-
Characteristics of Active Combustion Control for Liquid-Fuel Systems with Proportional Primary Fuel Modulation
… kerosene-fueled turbulent combustor. Using a phase shift controller and primary fuel modulation stability is successfully gained for a wide band of global equivalence ratios allowing the limitations of the control scheme to be characterized. It is shown that control signal saturation can …
-
Combustion characteristics of alternative liquid fuels
… airblast atomizer are investigated using a phase Doppler anemometry (PDA) under non-reacting conditions. The droplet size and velocity distribution of biodiesels are compared to conventional fuels. For spray combustion investigations, a generic gas turbine-type combustor is developed to …
-
Investigation of cutting temperature and cutting force from mist flow pattern in MQL technique
… were selected based on the results obtained from Phase Doppler Anemometry (PDA). The machining performance was evaluated under three levels of cutting speed and two levels of feed rate at constant depth of cut. The cutting force was measured using a set of dynamometer and cutting temperature using …
-
The Role of Fuel Droplets in Laminar Flame Propagation
… flame with fuel in liquid and vapour form. Gas phase velocity was measured using particle image velocimetry, from which the reference flame speed was approximated. Liquid phase properties, including droplet diameter, velocity, and concentration, were measured using phase Doppler anemometry. The …
-
Bio-butanol fuel atomization and combustion processes
… Electrospray structure was probed using Phase Doppler Anemometry and both droplet size and velocity measurements were obtained for sprays of butanol and butanol-containing fuel blends. These results indicated an unstable and polydisperse electrospray behavior for most conditions. Several …
-
Design and Numerical Simulation of the Real-time Particle Charge and Size Analyser
… (PSCA), investigated in this thesis, uses Phase Doppler Anemometry (PDA) technique. The PDA system was used to track the motion of charged particles in the presence of an electric field. By solving the equation of particle motion in a viscous medium combined with the simultaneous …
-
Spray visualization and characterization of a multi variable circular orifice (MVCO) injector coupled with a swirl adapter for diesel reformer applications
… from both the front view and the bottom view. Phase Doppler Anemometry (PDA) measurement was conducted at different locations in the spray for the acquisition of droplets size and velocity distribution. Difficulties in measurements were encountered for high pressure injection, especially in the …
-
Multihole injectors for direct-injection gasoline engines
… velocity and diameter with a two-component phase-Doppler Anemometry (PDA) system at injection pressures up to 200bar and chamber pressures varying from atmospheric to 12bar. The overall spray angles relative to the axis of the injector were found to be almost independent of injection and …
-
A study on the characteristics of the flow inside a thermostatic expansion valve
… cone angle and film thickness determination. A Phase Doppler Anemometry (PDA) system was used later to measure the size and velocity of individual droplets passing the location at the outlet of the orifice. It is found that the increase of the feeding pressure tends to expand the spray cone …
-
Effects of Thermoacoustic Oscillations on Spray Combustion Dynamics with Implications for Lean Direct Injection Systems
… in combustor through-flows and given the right phase conditions, can also drive unsteady heat release. This coupling has the potential to enhance the amplitude of pressure oscillations. To curb the potential harms caused by the existence of thermoacoustic instabilities, recent efforts have …
-
Experimental investigation of spray characteristics of prefilming airblast atomizers
… Die Sprühcharakterisierung wurde mittels Phasen-Doppler-Anemometrie (PDA) durchgeführt um den Einfluss verschiedener Parameter auf die lokale Tropfengröße und Geschwindigkeit im Spray zu untersuchen. Zuletzt werden Zukunftsansätze zu Entwicklung und Design eines …
-
Impact of alternative jet fuels on gas turbine combustion systems
… droplet distributions at this condition, a 2D phase Doppler anemometer (PDA) is used to characterize alternative jet fuels’ sprays and compare them to the Jet-A fuel spray in a realistic single-cup swirl-stabilized ‘referee’ combustor, under the umbrella of the Aviation Sustainability Center’s …
-
Τυρβώδης ροή σταγονιδίων σε στρωματοποιημένο θερμοκρασιακό πεδίο
… μελετήθηκε με την τεχνική Ανεμομετρίας Φάσης Doppler (PhaseDopplerAnemometry - PDA) η οποία επιτρέπει την μέτρηση τόσο της ταχύτητας όσο και του μεγέθους των σταγονιδίων παρέχοντας τη δυνατότητα συσχέτισης των δύο μεγεθών για τον ενδελεχή χαρακτηρισμό της συμπεριφοράς των σταγονιδίων. Η …