Air velocities at several points near the spark plug location were measured using a laser Doppler anemometer (LDA) in a motoring internal combustion engine. This engine was equipped with three intake configurations: a standard valve in a standard port, a standard valve in a helical (swirl) port, and a shrouded valve in a standard port. Both ensemble-averaged and cycle-resolved mean velocities were determined; this allows comparison of rms velocity fluctuation, cycle-resolved turbulence, and cycle-by-cycle variations in mean velocity. Frequency domain analysis of these components was also carried out. The main conclusion of this experimental study was that starting from a very low swirl situation (standard valve case), addition of a moderate amount of swirl (swirl port case) goes a long way towards improving cycle repeatability and increasing cycle-resolved turbulence. Increasing swirl even further (shrouded valve case) does not produce further dramatic improvements.
Influence of Inlet Flows on the Flow Field in an Engine
Sae Technical Papers
SAE International Congress and Exposition ; 1987
1987-02-01
Conference paper
English
Influence of Inlet Flows on the Flow Field in an Engine
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