Search for dissertations about: "Mach number"

Showing result 6 - 10 of 54 swedish dissertations containing the words Mach number.

  2. 6. Numerical Investigations of Generation and Propagation of Sound Waves in Low Mach Number Internal Flows

    Author : Axel Kierkegaard; Gunilla Efraimsson; Mats Åbom; Wolfgang Polifke; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustics; Akustik;

    Abstract : Traffic is a major source of environmental noise in modern day society. Subsequently, development of new vehicles are subject to heavy governmental legislations. The major noise sources on common road vehicles are engine noise, transmission noise, tire noise and, at high speeds, wind noise. READ MORE

  4. 7. Acoustic scattering in ducts and influence of flow coupling

    Author : Susann Boij; KTH; []
    Keywords : sound; vortex sheet; flow separation; end correction; Strouhal number; non-orthogonal modes; energy balance; TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : The subject of this thesis is the acoustic properties offlow duct area expansions and the influence of flow-acousticcoupling at sharp edges. For low Mach number flow, significantinteraction between the sound field and the flow field canoccur at such points of flow separation. READ MORE

  5. 8. A Study of Mach 0.75 Jets and Their Radiated Sound Using Large-Eddy Simulation

    Author : Niklas Andersson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Jet noise; CAA; LES; Large Eddy Simulation; Computational Aero-Acoustics;

    Abstract : Large-Eddy Simulations (LES) of a compressible nozzle/jet configuration have been carried out. Two jets were simulated, an isothermal jet and a jet with a higher temperature than the surrounding air. The Mach number was in both cases 0.75 and the jet Reynolds number was 50,000. READ MORE

  6. 9. Design and Characterization of SiN-based integrated optical components for Wavelength Division Multiplexing

    Author : Alexander Caut; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; crosstalk; silicon nitride.; Mach-Zehnder interferometers; polarization; grating couplers; insertion loss; power splitters; arrayed waveguide gratings; silicon photonics;

    Abstract : To follow the trend of the data traffic and to limit the size of the hyperscale data centers, communication solutions offering small footprint, low cost and low power consumption are needed. Optical interconnects used in data centers are mostly short reach (approximately 100 m) based on GaAs-based 850 nm vertical-cavity surface emitting lasers (VCSELs) and OM4 multimode fibers (MMF). READ MORE

  7. 10. Silicon nitride-based integrated components for optical communication

    Author : Alexander Caut; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mach-Zehnder interferometers; grating couplers; insertion loss; silicon photonics; power splitters; polarization; arrayed waveguide gratings; crosstalk; silicon nitride.;

    Abstract : To follow the trend of the data traffic and to limit the size of the hyperscale data centers, communication solutions offering small footprint, low cost and low power consumption are needed. Optical interconnects used in data centers are mostly short reach (approximately 100 m) based on GaAs-based 850 nm vertical-cavity surface emitting lasers (VCSELs) and OM4 multimode fibers (MMF). READ MORE