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Research Papers: Internal Combustion Engines

# High-Resolution Scalar and Velocity Measurements in an Internal Combustion Engine

[+] Author and Article Information
B. R. Petersen, D. M. Heim, J. B. Ghandhi

Engine Research Center, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706

J. Eng. Gas Turbines Power 132(9), 092804 (Jun 18, 2010) (6 pages) doi:10.1115/1.4000603 History: Received May 21, 2009; Revised June 03, 2009; Published June 18, 2010; Online June 18, 2010

## Abstract

High-resolution planar laser-induced fluorescence and particle image velocimetry (PIV) measurements were acquired during the intake stroke in a motored engine to investigate the mixing behavior of in-cylinder flows. The data were analyzed to determine the scalar energy and kinetic energy spectra, which were used to find the corresponding dissipation spectra. The results were compared with a model turbulent spectrum. The scalar energy and scalar dissipation spectra were shown to be resolved through the full dissipation range, enabling the determination of the Batchelor/Kolmogorov length scale and agreed well with the model turbulent spectrum at all but the highest wavenumbers where the effects of random noise were present. The 2% point in the scalar dissipation spectra was used to estimate the Batchelor scale, which was found to be approximately $32 μm$. The PIV data, which had a $675 μm$ interrogation region, were used to calculate a one-dimensional kinetic energy spectrum. The kinetic energy spectrum agreed well with the scalar energy spectrum and the model spectrum up to wavenumbers corresponding to approximately two times the PIV interrogation region size. For the present measurements, this meant that the PIV data were not able to resolve the peak in the dissipation spectrum, i.e., the full high-wavenumber part of the inertial subrange.

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## Figures

Figure 1

Diagram of optically accessible IC engine

Figure 2

Diagram of optical arrangement used in PLIF experiments

Figure 3

Regions of PLIF and PIV data collection

Figure 6

Measured averaged scalar dissipation spectra generated from the left-most columns and middle 100 columns of the image data: 600 RPM, Pin=99 kPa, Tin=323 K, and 240 deg bTDC-compression

Figure 5

(a) Measured averaged scalar energy spectrum and (b) measured average scalar dissipation spectrum—600 RPM, Pin=99 kPa, Tin=323 K, and 240 deg bTDC-compression

Figure 4

(a) Background and flatfield-corrected fluorescence image, (b) calculated dissipation field with a linear intensity scale, (c) calculated dissipation field with a log intensity scale, (d) instantaneous PIV image, and (e) mean PIV image: 600 RPM, Pin=99 kPa, Tin=323 K, and 240 deg bTDC-compression

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