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Analysis of In-Cylinder Gas Flow and Its Cyclic Variability Using PIV
Technical Paper
2004-08-0524
Sector:
Event:
JSAE Autumn Conference
Language:
Japanese
Abstract
The velocity distribution of in-cylinder cross-sections of a single-cylinder visualization engine were measured using PIV (Particle Image Velocimetry). Measurement errors due to distortion caused by imaging through the optical cylinder were analyzed quantitatively and a calibration method was developed to correct for the distortion. Then, the effect of various tumble control valve configurations on in- cylinder gas flow cyclic stability was investigated. Analysis revealed that while the cyclic variation of tumble ratio is small, the local velocity variations are as large as the spatially averaged mean velocity.