Sökning: "Spray"

Visar resultat 1 - 5 av 311 avhandlingar innehållade ordet Spray.

1. 1. Droplet Velocities in a Liquid Spray

   Författare :Andreas Cronhjort; KTH; []
   Nyckelord :Liquid spray; diesel spray; droplet velocities; droplet sizes; sprayvisualization; sliced spray; particle image velocimetry; spectrum; cepstrum; cross-correlation; auto-correlation;

   Sammanfattning : A method to look into a dense liquid spray has beenevaluated. The spray was mechanically sliced to remove theobscuring parts of it, thus gaining optical access to theinternal regions and thereby allowing for visualization ofpreviously unavailable parts of the spray. LÄS MER

3. 2. Experimental Investigation of ultra-high fuel injection pressure spray for GDI engines

   Författare :Akichika Yamaguchi; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spray; Spray imaging; Air entrainment; High Pressure; PIV; Spray tip penetration; GDI engine; PDI; drolet size;

   Sammanfattning : Gasoline Direct Injection Engines (GDI) for passenger cars currently use fuel injection systems operating at pressures of up to 350 bar. Injection pressures have increased over time, and there is evidence that particulate emissions could be reduced by raising them further, up to 500 bar. LÄS MER

4. 3. Measurement and evaluation of near-field spray kinematics for nozzles with asymmetrical inlet geometries

   Författare :Mohammad Nikouei; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nozzle Geometry; Spray Dynamics; Spray Velocity; Diesel Spray; Ballistic Imaging;

   Sammanfattning : In diesel engines, fuel injection parameters have a commanding effect on mixing and combustion quality. This research aims to enhance the fundamental knowledge of fuel sprays and their primary break-up. In addition, this research provides statistical data to validate simulation models and improve the prediction accuracy in mixing and combustion. LÄS MER

5. 4. Transient Spray Mode Fuel Injection

   Författare :Lokesh Mopuri; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; clogged nozzle; non-evaporative and reactive spray; thimble structure; Spray characteristics;

   Sammanfattning : This research examines the pivotal role of transient fuel spray in internal combustion engines, primarily focusing on their influence on dual-fuel (DF) engines. In the case of dual-fuel (DF) engines functioning in a gas mode, the controlling of the primary fuel’s ignition is usually managed through the direct injection of liquid pilot fuel. LÄS MER

7. 5. Small Orifices - Diesel Combustion and Spray Investigations

   Författare :Pär Bergstrand; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; multirow nozzles; small orifice diameter; diesel combustion; spray;

   Sammanfattning : Future demands on diesel engines, such as the need to meet stricter emission legislation, improve performance and lower fuel consumption, for lowering transportation cost and carbon dioxide emissions, forces the development of engines to take a major step in the near time. During the years of engine development, all components have been optimised in small steps at a time, but larger steps must now be taken to meet requirements of the future. LÄS MER