Sökning: "Compressor"

Visar resultat 1 - 5 av 108 avhandlingar innehållade ordet Compressor.

  1. 1. Simulation and Optimization of an Axial Compressor Considering Tip Clearance Flow

    Författare :Marcus Lejon; Chalmers University of Technology; []
    Nyckelord :design; compressor; optimization; validation; CFD; turbulence models; tip clearance;

    Sammanfattning : With ever-increasing demands for high efficiency in axial compressors, it has become important to consider more geometrical features of the manufactured component in the design phase. Many possibilities open if the level of fidelity of the computational model can be increased. LÄS MER

  2. 2. Unsteady Navier Stokes solver for the simulation of compressor flutter in turbomachines

    Författare :L. D. Gunnar Sidén; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; finite volume; finite element; compressor; fan; flutter; Navier Stokes; turbo machinery; unsteady; time marching;

    Sammanfattning : .... LÄS MER

  3. 3. Centrifugal compressor flow instabilities at low mass flow rate

    Författare :Elias Sundström; Mihai Mihaescu; Håkan Nilsson; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Centrifugal Compressor; Large Eddy Simulation; Internal Com- bustion Engine; Aeroacoustics; Modal Flow Decomposition;

    Sammanfattning : Turbochargers play an important role in increasing the energetic efficiency andreducing emissions of modern power-train systems based on downsized recipro-cating internal combustion engines (ICE). The centrifugal compressor in tur-bochargers is limited at off-design operating conditions by the inception of flowinstabilities causing rotating stall and surge. LÄS MER

  4. 4. Aerodynamic design framework for low-pressure compression systems

    Författare :Marcus Lejon; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; manufacturing variations; optimization; stage matching; tip clearance; validation; Turbomachinery; CFD; surface roughness; compressor;

    Sammanfattning : Aircraft engine manufacturers strive to improve current state of the art designs through continuous development efforts. By improving existing designs and exploring new alternatives, the goal is to reduce the fuel consumption - a topic of high relevance due to the remarkable growth rate of air traffc. LÄS MER

  5. 5. Optimization and Model Validation of Transonic Compressors

    Författare :Lars R Ellbrant; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; compressor; optimization; design; metamodels; CFD; validation; multiobjective;

    Sammanfattning : Economical aspects such as reduced specific fuel consumptions and ever growing environmental requirements on emissions and percieved noise levels, are the major drivers in the search for improvement of aircraft engines. For turbofan engines, the global trend is towards higher efficiency which is accomplished by increasing component efficiencies, the bypass ratio and overall pressure ratio while keeping the engine weight low. LÄS MER