Sökning: "subsonic flow"

Visar resultat 1 - 5 av 7 uppsatser innehållade orden subsonic flow.

  1. 1. Design of a High Subsonic Nozzle for a Transonic Linear Cascade Operating at Near Stall Conditions

    Kandidat-uppsats, KTH/Energiteknik

    Författare :César Lucio; [2021]
    Nyckelord :;

    Sammanfattning : This thesis presents the results of computational fluid dynamics (CFD) design calculations of a subsonic nozzle operating at Mach number 0.85 in a transonic linear cascade wind tunnel. The purpose of the nozzle is to accelerate a fluid by decreasing the pressure energy and raising the kinetic one. LÄS MER

  3. 2. Two-dimensional roughness and Tollmien-Schlichting waves: a study on transition

    Master-uppsats, KTH/Strömningsmekanik och Teknisk Akustik

    Författare :Derek Micheletto; [2020]
    Nyckelord :;

    Sammanfattning : Two-dimensional (2D) roughnesses induce premature transition to turbulence in laminar boundary layers by amplifying the disturbances in the flow and promoting the development of non-linearities. The present thesis aims at furthering our understanding of this phenomenon's underlying mechanisms and elucidating the effects of the different geometrical parameters of the roughness' cross section. LÄS MER

  4. 3. Laboratory exercise - Compressible flow, oblique shock waves

    Kandidat-uppsats, KTH/Skolan för teknikvetenskap (SCI)

    Författare :Matheus Svedholm; Josefine Gessl; [2020]
    Nyckelord :;

    Sammanfattning : When studying to become an engineer the education is mainly theoretical and to confirm the theory laboratory exercises are incorporated in the curriculum. Being able to visualize the phenomenons studied helps in giving the students a deeper understanding. LÄS MER

  5. 4. Transonic Flutter for aGeneric Fighter Configuration

    Master-uppsats, KTH/Flygdynamik

    Författare :Axel Bååthe; [2018]
    Nyckelord :Flutter; Aeroelasticity; Transonic; Unsteady Aerodynamics; Doublet-Lattice Method; Full-Potential Equation; PK-Method;

    Sammanfattning : A hazardous and not fully understood aeroelastic phenomenon is the transonic dip,the decrease in flutter dynamic pressure that occurs for most aircraft configurationsin transonic flows. The difficulty of predicting this phenomenon forces aircraft manufacturersto run long and costly flight test campaigns to demonstrate flutter-free behaviourof their aircraft at transonic Mach numbers. LÄS MER

  7. 5. Determination of aerodynamic damping at high reduced frequencies

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Minghao Pan; [2017]
    Nyckelord :Aerodynamic damping; reduced frequency; forced response; acoustic mode; acoustic resonance; Aerodynamisk dämpning; reducerad frekvens; aerodynamiskt påtvingade vibrationer; akustiskt svängningsform; akustisk resonans;

    Sammanfattning : Forced response which is blade vibration due to an external excitation can lead to blade failure. The estimation of the level of vibration is dependent on the determination of aerodynamic damping. This thesisinvestigates the determination of aerodynamic damping at high reduced frequencies in turbomachines. LÄS MER