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Visar resultat 1 - 5 av 280 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Engine Knock: Characteristics and Mechanisms

   Författare :Klaas Burgdorf; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; SWACER; SI engines; quasi-detonation; autoignition; developing detonation; knock;

   Sammanfattning : Knock in SI engines limits both power density and fuel conversion efficiency. The main mechanisms with the potential to generate the cylinder pressure fluctuations generally observed during knocking combustion are discussed. It is reasoned that some mechanisms of flame acceleration can further amplify a shock wave generated by autoignition. LÄS MER

3. 2. Knock in Gasoline Engines - the Effects of Mixture Composition on Knock Onset and Heat Transfer

   Författare :Börje Grandin; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; SI engines; knock; heat transfer; thermal-boundary layer; cooled EGR; coherent anti-Stokes Raman spectroscopy CARS ; autoignition;

   Sammanfattning : This thesis is based on experimental investigations into engine knock in, (a) a multi-cylinder turbocharged engine, and (b) a single-cylinder engine featuring optical access. The optical access facilitated the measurement of temperature in the end-gas using coherent anti-Stokes Raman spectroscopy (CARS). LÄS MER

4. 3. 1-D simulation of turbocharged SI engines : focusing on a new gas exchange system and knock prediction

   Författare :Christel Elmqvist-Möller; Hans-Erik Ångström; Daniel Håkansson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; spark ignited engines; 1-D flow simulation; knock; Divided Exhaust Period; turbocharged engines; Other engineering mechanics; Övrig teknisk mekanik;

   Sammanfattning : This licentiate thesis concerns one dimensional flow simulation of turbocharged spark ignited engines. The objective has been to contribute to the improvement of turbocharged SI engines’ performance as well as 1 D simulation capabilities. Turbocharged engines suffer from poor gas exchange due to the high exhaust pressure created by the turbine. LÄS MER

5. 4. Knock detection with wavelets

   Författare :Krister Boman; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : .... LÄS MER

7. 5. Knock Knock Knock, Who is there? - Cell Crosstalk within the Bone Marrow

   Författare :Jenny Stjernberg (Zetterblad); Mikael Sigvardsson; Jan-Ingvar Jönsson; Hanna Mikkola; Linköpings universitet; []
   Nyckelord :;

   Sammanfattning : This thesis is focused on the subject of cell-cell interaction. Our body is composed of cells, most of them are integrated in a network with other cells that together forms tissues and organs. Every cell type in these complex organs has its special task and location. LÄS MER