Sökning: "cavitation erosion"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden cavitation erosion.

  1. 1. Cavitation analysis on test rig. : An experimental and CFD study executed in collaboration with Epiroc AB

    Master-uppsats, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Oskar Kuoppala; [2021]
    Nyckelord :CFD; Cavitation; Water Hammer;

    Sammanfattning : This master thesis project was done in collaboration with Epiroc Group Ab. Epiroc supplies high-quality drills of various types that can be used both above and below ground. A major problem in their percussive rock drills is that that cavitation is formed. Cavitation is a phenomenon that occurs when a fluid is subject to a sudden pressure drop. LÄS MER

  3. 2. Fluid/Material Coupled Numerical Analysis of Single Bubble Collapse Near a Pit on a Wall

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Daiki Makii; [2020]
    Nyckelord :Bubble Dynamics; Cavitation Erosion; Numerical Analysis; Fluid Material Coupled Numerical Method; Homogeneous Model; Elastic Body Material; Erosion Pit;

    Sammanfattning : In order to elucidate the progression mechanism of cavitation erosion, the behaviors of a single cavitation bubble collapse near a pit on a wall and both the resulting pressure wave in fluid and stress wave in material are investigated in detail. To find out the mechanism of cavitation erosion, many experimental studies on the bubble collapse behavior near a flat rigid wall and the resulting material damage have been conducted so far. LÄS MER

  4. 3. Experimental Study of Metallic Surfaces Exposed to Cavitation

    Master-uppsats, KTH/Materialvetenskap

    Författare :Marcio Freitas De Abreu; [2018]
    Nyckelord :cavitation; cylinder liner; lamellar gray cast iron; erosion pitting; graphite class; cavitation;

    Sammanfattning : Cylinder liners in heavy-duty truck engines are subjected to intense vibrations and may sustain damage from the cavitation of bubbles in the coolant liquid, with some risks of leakage and engine breakdown. An ultrasonic oscillating probe was used to simulate the pitting rates and behavior of samples extracted from cylinder liners, which are made of grey cast iron, with differences in surface roughness, glycol and inhibitor content in coolant, coolant temperature and graphite flake class; bainitic microstructures were also tested. LÄS MER

  5. 4. Bottenutskov i vattenkraftsdammar : Möjligheter, risker och strömningsmekaniska utmaningar

    Uppsats för yrkesexamina på avancerad nivå, Umeå universitet/Institutionen för tillämpad fysik och elektronik

    Författare :Jakob Skarin; [2017]
    Nyckelord :;

    Sammanfattning : Dammen i en vattenkraftsanläggning används för att avleda vatten till kraftverkets turbiner och för att möjliggöra lagring och reglering av energi. Vid stora flöden i älven, eller när vattnet av någon anledning inte kan passera genom de energiproducerande delarna, måste det avbördas från magasinet. Detta görs med utskov. LÄS MER

  7. 5. Thin metal patch to FRP propeller: Experimental testing of bonding systems

    Master-uppsats, KTH/Lättkonstruktioner

    Författare :Mårten Kreiss Amberg; [2015]
    Nyckelord :;

    Sammanfattning : To enable the use of carbon fibre reinforced polymer (CFRP) propellers for merchant vessels, the problem of cavitation must be solved. The matrix of the FRP is generally brittle and more sensitive to cavitation erosion than the more conventional metal propeller blades. Nakashima Propeller Co. LÄS MER