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.
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