Sökning: "Teknik och teknologier Maskinteknik Strömningsmekanik och akustik"
Visar resultat 1 - 5 av 906 avhandlingar innehållade orden Teknik och teknologier Maskinteknik Strömningsmekanik och akustik.
1. Large-Eddy Simulation of Gasoline Fuel Spray Injection at Ultra-High Injection Pressures
Sammanfattning : Gasoline direct injection is a state-of-the-art technique that reduces hydrocarbon and particulate emissions. However, further improvement is needed to meet current as well as future emission regulations. LÄS MER
2. Particulate Formation in GDI Engines
Sammanfattning : The need to comply with stringent emission regulations while improving fuel economy and reducing criteria pollutant emissions from transportation presents a major challenge in the design of gasoline Direct Injection (DI) engines because of the adverse effects of ultrafine Particulate Number (PN) emissions on human health and other environmental concerns. With upcoming advances in vehicle electrification, it may be the case that electric vehicles completely replace all current vehicles powered by internal combustion engines ensuring zero emissions. LÄS MER
3. Computational Aeroacoustics Based on Large Eddy Simulation and Acoustic Analogies
Sammanfattning : The thesis presents a numerical method developed by the author and its applications for computing the generated sound by an unsteady flow field and its propagation. The full equations of motion for compressible and unsteady flows describe both flow field and sound generation and propagation. LÄS MER
4. On the Analysis of Energy Efficient Aircraft Engines
Sammanfattning : Aero engine performance analysis is highly multidimensional using various measures of component performance such as turbomachinery and mechanical efficiencies, and pressure loss coefficients. Using conventional performance analysis, relying on only the laws of thermodynamics, it is possible to understand how the performance parameters affect the component performance, but it is difficult to directly compare the magnitude of various loss sources. LÄS MER
5. The role of piston bowl shape in controlling soot emissions from heavy-duty Diesel engines
Sammanfattning : .... LÄS MER