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TECHNICAL PAPERS—SPECIAL ICE SECTION: In-Cylinder Processes

The Separation Between Turbulence and Mean Flow in ICE LDV Data: The Complementary Point-of-View of Different Investigation Tools

[+] Author and Article Information
Mario Amelio, Sergio Bova

Dipartimento di Meccanica, Università della Calabria, 87030 Rende (Cosenza), Italy

Carmine De Bartolo

Dipartimento di Ingegneria Idraulica ed Ambientale Università di Pavia, Via Abbiategrasso, 213 27100 Pavia, Italye-mail: debarto@ipv36.unipv.it

J. Eng. Gas Turbines Power 122(4), 579-587 (Jun 08, 2000) (9 pages) doi:10.1115/1.1290588 History: Received March 02, 2000; Revised June 08, 2000
Copyright © 2000 by ASME
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References

Figures

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Schematic drawing of LDV test engine
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Schematic of the LDV set-up
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Velocity fluctuation peaks around the middle of the intake stroke
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Autocorrelation function. The reference point is at the middle of the intake stroke.
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Autocorrelation function. The reference point is at the middle of the compression stroke.
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ACF computed for velocity measured near the exhaust valves
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Velocity field at 270 (a) and at 450 (b) deg ABDC
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Time coherence versus degree
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Cut-off frequency obtained from the coherence-time of the autocorrelation function
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Power spectra (a) near the intake valves at 600 rpm; (b) near the intake valves at 800 rpm; (c) center of the chamber at 600 rpm; (d) near the exhaust valves at 600 rpm.
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Frequency spectrum (a) integrated spectrum (dots) and interpolating function Y(f ) (b)
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Cut-off frequency obtained from the frequency spectrum of the ensemble-averaged velocity
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Mean velocity obtained with the ensemble average and with the cycle-resolved methods.
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Comparison of velocity fluctuation intensity (ensemble-average) and uLF′2(θ̄)+uHF′2(θ̄) quantity (cycle-resolved)

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