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 9 of 9 for “"Cavitation Inception"”.
-
Micro-scale turbopump blade cavitation
… span and operate at a Reynolds number of 6000. Cavitation is a major technical issue in such a pump, but there is little work in the literature at this length scale. This work documents analytical and experimental investigations of cavitation on millimeter long pump blading. Cavitation inception …
-
Adjoint-based geometry optimisation with applications to automotive fuel injector nozzles
… localised region around the hole inlet, where cavitation inception appears, is parameterised and modified during the optimisation procedure, while the rest of the nozzle remains unaffected. The parameters modifying the geometry are the radius of curvature and the diameter of the hole inlet or …
-
Hydrodynamische Effekte unter besonderer Berücksichtigung der Wasserqualität und ihre Messverfahren
… water quality particularly affects certain cavitation phenomena. Various cavitation tests around the world have shown that without determining the actual tensile strength of the test water, it is impossible to obtain reproducible results regarding cavitation inception. In experiments …
-
Computational study of 3D turbulent air flow in a helical rocket pump inducer
… air-LH2 analogy permitted the prediction of cavitation inception in the liquid hydrogen pump, and the results obtained correspond qualitatively well with water flow visualizations. The accordance of the model with available air test data at the inlet and exit of the inducer is generally very …
-
Cavitation and Bubble Formation in Water Distribution Systems
Gaseous cavitation is examined from a practical and theoretical standpoint. Classical cavitation experiments which disregard dissolved gas are not directly relevant to natural water systems and require a redefined cavitation inception number which considers dissolved gases. In a pressurized water …
-
Computational study of 3D turbulent flow in a tandem inducer/impeller rocket pump rotor
… is achieved in the impeller main-blade passages. Cavitation inception is also discussed. Additional 3D calculations are performed for the inducer alone, with varying exit geometry (axial or radial). Comparisons of geometry influence on the inducer flow are carefully investigated, as well as the …
-
Data Analysis of an Unsteady Cavitating Flow on a Venturi-type Profile
… mean flow, to the smaller scales such as cloud cavitation and Kelvin-Helmholtz (KH) instability. It is demonstrated that the POD decorrelation of length scales yields inherently quasi-periodic time dynamics, e.g., incommensurate frequencies. Moreover, the eigenvalue obtained from DMD revealed …
-
Experimental study and characterization of bubble behaviors in the orifice-induced hydrodynamic cavitation
… the development process of orifice-induced cavitation and transitional bubble behaviors. The transition from non-cavitation to fully developed cavitation was carefully studied. Cavitation bubble clouds were observed at orifice, indicating the inception of cavitation. The number of bubbles …
-
Numerical modeling and simulation of cavitating flows in different regimes
… of multiphase cavitating flows over different cavitation regimes. Unstructured grids are considered to enable complex geometries to be considered. The dissertation has the following major components: (i) a compressible homogeneous approach for a mixture of water–vapor–gas is developed to study …