Full-field measurements are presented for cycle variability analysis within in-cylinder flows. A high-speed particle image velocimetry system has been developed with a framing rate of 13.5 kHz to allow single pulse multiple frame cross-correlation processing. This frame rate produced velocity vector maps at approximately 1 deg. crank angle temporal resolution for engine speeds up to 2000 rpm. A novel processing scheme employing the temporal product of correlation functions is shown to increase vector validation rates enabling a statistical flow analysis. Velocity data have been obtained over 15 engine cycles for two engine conditions to demonstrate the operation of the instrumentation and processing algorithms. The data obtained show that changing the axial swirl level via the inlet port geometry has a significant effect on the cycle variability of the flow on the latter half of the combustion stroke. The technique allows the acquisition and processing of magnitude time and cost savings compared to using single point optical velocimeters.
Cyclic variability measurements of in-cylinder engine flows using high-speed particle image velocimetry
Zyklische Variabilitätsmessung der Zylinderströme mittels Teilchen-Geschwindigkeitsmesser
Measurement Science and Technology ; 15 , 9 ; 1917-1925
2004
9 Seiten, 9 Bilder, 13 Quellen
Article (Journal)
English
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