Sökning: "cavitation"

Visar resultat 1 - 5 av 102 avhandlingar innehållade ordet cavitation.

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

    Författare :Mikael Grekula; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cavitation; experimental studies; cavitation erosion; cavitation mechanisms; hydrodynamics; cavitation noise; cavitation assessment;

    Sammanfattning : 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. LÄS MER

  3. 2. Modelling Cavitation Mechanisms Using Large Eddy Simulation

    Författare :Nai Xian Lu; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydrodynamics; Cavitation; cavitation erosion; cavitation mechanisms; numerical simulation; LES;

    Sammanfattning : 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. LÄS MER

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

    Författare :Johannes Schöön; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cloud cavitation; re-entrant jet; cavitation erosion; gust generation; cavitation;

    Sammanfattning : 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. LÄS MER

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

    Författare :Jan Hallander; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; numerical simulation; collapse of vapour cavities; experimental studies; pressure pulses; cavitation noise; hydrodynamics; cavitation; bubbles; cavitating flows;

    Sammanfattning : 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. LÄS MER

  7. 5. Process Intensification through Acoustic and Hydrodynamic Cavitation

    Författare :Taraka Rama Krishna Pamidi; Örjan Johansson; Torbjörn Löfqvist; Giancarlo Cravotto; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ultrasonic Cavitation; Hydrodynamic Cavitation; Process Intensification; Cellulose fiber; Tungsten; Refining; Leaching; Teknisk akustik; Engineering Acoustics;

    Sammanfattning : Process industries are cornerstones in today’s industrialized world. They contribute significantly to the development of diverse commodities and materials that are used in our daily lives. Process intensification is an approach implemented to boost manufacturing efficiency and capacities in a more sustainable and energy efficient way. LÄS MER