Sökning: "small engines"

Visar resultat 16 - 20 av 112 avhandlingar innehållade orden small engines.

1. 16. Laser Diagnostics for Applications to In-Cylinder Engine Investigations

   Författare :Robert Collin; Förbränningsfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LII; Rayleigh scattering; formaldehyde; OH; soot; dimethyl ether; Laser technology; Fysik; Laserteknik; Physics; LIF; Laser diagnostics; combustion engines; Fysicumarkivet A:2004:Collin;

   Sammanfattning : In the work presented in the thesis laser diagnostics was employed primarily in the investigation of engines, but was also used to study soot in flames. Quantitative measurements were performed for visualizing both in-cylinder soot formation and DME sprays in a combustion vessel. LÄS MER

3. 17. Discribing the Auto-Ignition Quality of Fuels in HCCI Engines

   Författare :Per Risberg; David E. Foster; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Auto-Ignition Quality; RON; MON; Cetane Number; HCCI; CAI and Fuels; Other engineering mechanics; Övrig teknisk mekanik;

   Sammanfattning : The Homogeneous Charge Compression Ignition (HCCI) engine is a promising engine concept that emits low concentrations of NOx and particulates and still has a high efficiency. Since the charge is auto-ignited, the auto-ignition quality of the fuel is of major importance. LÄS MER

4. 18. Particles and unregulated emissions from CI engines subjected to emission control

   Författare :Kent Nord; Luleå tekniska universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Chemistry of Interfaces; Gränsytors kemi;

   Sammanfattning : Compression ignited (CI) engines, commonly known as diesel engines, are widely used power sources with complex emissions used in on-road and nonroad applications. To find out the impact of diesel exhaust emissions on health and the environment, both regulated and unregulated exhaust gas properties have to be evaluated. LÄS MER

5. 19. Flow Control and Shape Optimization of Intermediate Turbine Ducts for Turbofan Engines

   Författare :Fredrik Wallin; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; CFD; response surface methodology; intermediate turbine duct; vortex generators; turbine intermediate case; endwall contouring; turbine center frame; body-force model; shape optimization; mid-turbine frame; flow control;

   Sammanfattning : Demands on improved efficiency, reduced emissions and lowered noise levels cause a strive towards high by-pass ratios of commercial turbofan engines. This results in an increased radial offset between the high- and low-pressure turbines. Thus the design of the intermediate turbine duct connecting the two turbines becomes more challenging. LÄS MER

7. 20. Kinetic investigations of combustion of small oxygenated aliphatic hydrocarbons – modeling and experiments

   Författare :Gianluca Capriolo; Förbränningsfysik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kinetic modelling; Nitric Oxide; n-propanol; i-propanol; propanal; LIF; Fysicumarkivet A:2020:Capriolo;

   Sammanfattning : The depletion of oil reserves and the increasingly stringent European Union regulation of air pollution have forced researchers and manufacturers to search for cleaner and sustainable substitutes to petroleum‐based transportation fuels. Biofuels like small aliphatic alcohols are of increasing interest as alternatives to fossil fuels, as they offer long‐term fuel‐source regenerability. LÄS MER