Sökning: "Turbomachinery"

Visar resultat 31 - 35 av 60 avhandlingar innehållade ordet Turbomachinery.

  1. 31. Turbomachinery Aeroacoustic Calculations using a Time Domain Chorochronic Method

    Författare :Martin Olausson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rotor Stator interaction; Fan-Noise; Time lag; Chorochronic; Nonlinear; Computational Aeroacoustics;

    Sammanfattning : Noise regulations for aircrafts that fly over populated areas are continuously becoming stricter. This in combination with increasing computational capabilities has boosted interest in aeroacoustic computations in the aerospace industry. LÄS MER

  3. 32. Design and Detailed Analysis of Turbomachinery Blades using Truncated Domains

    Författare :Gonzalo Montero Villar; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Evolutionary algorithms; Phase-lagged boundary conditions; Sliding grid; LODI; Stochastic optimization; Synthetic turbulence; CFD; Chorochronic;

    Sammanfattning : With the continuous growth in air traffic that we are seeing nowadays comes an increase in the requirements needed to be satisfied by an aircraft for it to be certified to fly. These stricter regulations affect aspects such as CO2 emissions, sound pollution and so on, pushing manufacturers to aim for lighter, more efficient, more robust designs. LÄS MER

  4. 33. Improved Flutter Prediction for Turbomachinery Blades with Tip Clearance Flows

    Författare :Tianrui Sun; Andrew R. Martin; Paul Petrie-Repar; Mihai Mihaescu; KTH; []
    Nyckelord :Steam turbine; Flutter; Aeroelastic stability; Tip clearance flow; Detached-Eddy Simulation; Energiteknik; Energy Technology;

    Sammanfattning : Recent design trends in steam turbines strive for high aerodynamic loading and high aspect ratio to meet the demand of higher efficiency. These design trends together with the low structural frequency in last stage steam turbines increase the susceptibility of the turbine blades to flutter. LÄS MER

  5. 34. The Influence of Flow Leakage Modelling on Turbomachinery Blade Forcing Predictions

    Författare :Tobias Gezork; Björn Laumert; Paul Petrie-Repar; Damian Vogt; Mehdi Vahdati; KTH; []
    Nyckelord :Energiteknik; Energy Technology;

    Sammanfattning : Vibrations in turbomachinery engine components are undesirable as they put the structural integrity of the components at risk and can lead to failure during the lifetime of the turbomachinery engine. Vibrations arising from aerodynamic forces and stability of turbomachinery blades is assessed in the discipline of aeromechanics. LÄS MER

  7. 35. Analysis of laminar and turbulent flows with turbomachinery, biotechnology and biomechanical applications

    Författare :Gustaf Mårtensson; Arne Johansson; Gertjan van Heijst; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fluid mechanics; Strömningsmekanik;

    Sammanfattning : The goal of this study was initially to gain a better understanding of the effects of rotation on turbulent flow in ducts. Knowledge concerning the influence of rotation on the structures of turbulence is of fundamental importance in many applications, e.g. LÄS MER