Sökning: "Sprays"

Visar resultat 6 - 10 av 79 avhandlingar innehållade ordet Sprays.

1. 6. Optical Diagnostics Applied to Internal Combustion Engines: Catalysis, Sprays and Combustion

   Författare :Stina Hemdal; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; sprays; Optical diagnostics; engines; ; combustion; spray-guided; SGDI; Direct-injection; catalys;

   Sammanfattning : Gasoline direct injection with spray-guided charge formation is one of the most promising concepts to reduce fuel consumption and CO2 emissions of spark ignited engines. The advantages with the system are owing to un-throttled operation and stratification of the injected fuel resulting in a globally lean combustion. LÄS MER

3. 7. Droplet size, concentration, and temperature mapping in sprays using SLIPI-based techniques

   Författare :Yogeshwar Nath Mishra; Förbränningsfysik; []
   Nyckelord :Sprays; Optical measurements; Laser diagnostic; Droplet size; Temperature; Fysicumarkivet A:2018:Mishra;

   Sammanfattning : Structured laser illumination planar imaging (SLIPI) is a technique capable of suppressing multiple light scattering effects in optically dense sprays, resulting in spray images without blurs and with enhanced contrast. The novelty of the work presented in this thesis concerns the applications of a variety of SLIPI-based techniques for the measurement of droplet size, droplet concentration, and liquid temperature in atomizing sprays. LÄS MER

4. 8. Advances in Time-gated Ballistic Imaging for Studies of Atomizing Fuel Sprays

   Författare :Mattias Rahm; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ultrafast lasers; Ballistic imaging; Atomizing sprays; Fuel sprays; OKE-effect;

   Sammanfattning : The transportation sector of today relies heavily on fossil fuels. This is undesirable both due to the finite nature of the fossil resources and to the effects of global warming. Therefore, there is a need to find alternative fuels and simultaneously develop combustion engines with higher efficiencies. LÄS MER

5. 9. Spray-Wall Interaction of Diesel Sprays

   Författare :Alf Magnusson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wall impingement; Diesel sprays; Optical measurements; Model fuel;

   Sammanfattning : A promising combustion concept that aims at reducing emissions from DI Diesel engines is HCCI (Homogeneous Charge Compression Ignition). To achieve a combustible air/fuel mixture in such an engine one possible strategy is early fuel injection during the compression stroke, even though the in-cylinder conditions are different from those in conventional DI diesel engines. LÄS MER

7. 10. Modelling of Multicomponent Fuel Sprays

   Författare :Vignesh Pandian Muthuramalingam; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multicomponent fuel sprays; diesel and gasoline engine conditions; CFD; resolving counterbore; GDI injector; resolving injector orifice; secondary breakup; stochastic blob and bubble model; differential evaporation;

   Sammanfattning : The use of fuel blends (conventional fuels blended with renewable ones) has gained importance in the automotive industry as an option to reduce emissions and dependence on fossil fuels. In order to make the fuel blends commercially viable, computational fluid dynamics (CFD) is used to complement the experiments (done on engines or spray chambers) by providing fundamental insight into spray formation. LÄS MER