Title: Wavelet analysis of turbulent velocity fields in a spark ignition engine

Authors: Ahmet Erdil

Addresses: Department of Mechatronics Engineering, Kocaeli University, Umuttepe Campus, 41380, Kocaeli, Turkey

Abstract: The issue of decomposing in-cylinder flow into mean and turbulence velocities remains unresolved. Spark Ignition (SI) engine flows are inherently non-stationary because of the piston and valve motions. In SI engine combustion chamber, turbulence is superimposed on unsteady organised motion of a mean flow. These turbulent flows have been studied by time or ensemble averaging methods and low-pass, high-pass filter methods. In this study, wavelet transform has been applied to experimentally measured turbulent velocity field in an SI engine to extract information about coherent structures. The radial and circumferential turbulent velocity fields are measured using hot wire anemometer under motoring conditions at various engine configurations.

Keywords: turbulence; wavelet transforms; spark ignition engines; coherent structures; forced flows; hot wire anemometry; 1D turbulent flow; combustion; turbulent velocity fields.

DOI: 10.1504/IJVD.2010.035355

International Journal of Vehicle Design, 2010 Vol.54 No.2, pp.123 - 136

Received: 16 Nov 2009
Accepted: 10 May 2010

Published online: 26 Sep 2010 *

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