Knocking Investigations in a small Two-Stroke SI Engine 2009-32-0013
The trend of higher specific power and increased volumetric efficiency leads to unwanted combustion phenomenon such as knocking, pre-ignition and self-ignition.
For four-stroke engines, the literature reports that knocking depends, to a large extent, on the ignition angle, the degree of enrichment and the volumetric efficiency. In recent research, knock investigations in two-stroke engines have only been carried out to a limited extent.
This paper discusses an investigation of the influence of various parameters on the knock characteristics of a small, high-speed, two-stroke SI engine. In particular, the degree of enrichment, the volumetric efficiency and the ignition timing serve as the parameters.
Kai Schreer, Kai W. Beck, Sören Bernhardt, Ulrich Spicher, Werner Geyer, Stephan Meyer
Universitaet Karlsruhe (TH), Germany, Andreas STIHL AG & Co. KG, Waiblingen, Germany
Small Engine Technology Conference & Exposition