Search for dissertations about: "cavitation"

Showing result 1 - 5 of 82 swedish dissertations containing the word cavitation.

  1. 1. Cavitation Mechanisms Related to Erosion Studies on Kaplan Turbines, Foils, and Propellers

    Author : Mikael Grekula; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cavitation mechanisms; hydrodynamics; Cavitation; cavitation assessment; cavitation erosion; experimental studies; cavitation noise;

    Abstract : The overall aim of this thesis work is to study cavitation behaviours related to erosion. The focus is on processes of observable scale, i.e. the process prior to the micro scale level at which the actual damage is generated. READ MORE

  2. 2. Modelling Cavitation Mechanisms Using Large Eddy Simulation

    Author : Nai Xian Lu; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrodynamics; Cavitation; cavitation erosion; cavitation mechanisms; numerical simulation; LES;

    Abstract : Cavitation often brings negative effects such as performance degradation, noise and vibration, and material damage, being one of the limiting factors when designing propulsion systems. On the other hand, cavitation must be endured for an efficiently propelled system. READ MORE

  3. 3. A Method for the Study of Unsteady Cavitation - Observations on Collapsing Sheet Cavities

    Author : Johannes Schöön; [2000]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cloud cavitation; re-entrant jet; cavitation erosion; gust generation; cavitation;

    Abstract : When subjected to sufficiently low pressures, water will eventually come apart. Gas-filled cavities appear in the water: it is said to cavitate. When the cavities collapse, they often do so quite vigorously, causing noise, vibrations and erosion. A well-known example of cavitation is that found on heavily loaded ship propellers. READ MORE

  4. 4. Influence of Acoustic Interaction between Cavities That Generate Cavitation Noise

    Author : Jan Hallander; [2002]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; numerical simulation; collapse of vapour cavities; experimental studies; pressure pulses; cavitation noise; hydrodynamics; cavitation; bubbles; cavitating flows;

    Abstract : The thesis concerns high frequency cavitation noise generated by marine propellers, for example. The collapse of a cavity is forced by the surrounding pressure which comprises the pressure in the undisturbed flow, the pressure disturbance associated with the local non-cavitating flow and, finally, the pressure disturbance from the presence and motion of neighbouring cavities. READ MORE

  5. 5. Computational Modelling for Cavitation and Tip Vortex Flows

    University dissertation from Gothenburg : Chalmers tekniska högskola

    Author : Abolfazl Asnaghi; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cavitation; SST k − ω; OpenFOAM; Propeller; LES; Numerical simulation; Cur- vature correction; Elliptical foil; Inception; Twisted Delft foil;

    Abstract : Cavitation often brings negative effects, such as performance degradation, noise, vibration, and material damage, to marine propulsion systems, but for optimum performance, cavitation is almost inevitable. Therefore, it is necessary to better understand cavitation in order to maximize the performance without encounter- ing severe problems. READ MORE