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An investigation of squish generated turbulence in. I.C. engines

University of British Columbia

Experiments were performed with a single cylinder C.F.R. engine to provide data for the evaluation of the squish designs. Several reference squish chambers were manufactured for the C.F.R. engine. Flow field data was obtained via hot wire anemometer measurements taken in the cylinder during motored operation of the engine. Pressure data recorded while the engine was operated on natural gas yielded mass burn rate information. Mass burn rate analysis of cylinder pressure data shows the squish design to have greatest impact on the main combustion period (2% to 85% mass burned). A comparison of the reference squish design in these experiments to the disc chamber shows a 32% reduction in the combustion duration and a 30% increase in peak pressure occurring 5 crank angle degrees earlier. The squish-jet design provided the additional effect of a reduction in the ignition delay time (spark to 2% mass burned). The squish-jet design resulted in a reduction of the ignition delay time by 3 crank angle degrees and in a 4% increase in peak pressure occurring 3 crank angle degrees earlier compared to the reference squish chamber. The total combustion duration was 5% less with the squish-jet design.

Text

2010-05-26

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http://hdl.handle.net/2429/25068

Mechanical Engineering

University of British Columbia

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