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Date of Publication:2007-01-01

Journal:内燃机学报

Issue:3

Page Number:241-246

ISSN No.:1000-0909

Abstract:The in-cylinder flow evolvement process is investigated with the wavelet analytical method and ensemble average method. On a motoring modified four-valve diesel engine, the velocity of upper flow-field was measured with LDA. Mean tangential velocity and turbulent intensity were calculated and compared for the two methods. The analysis results with different wavelet functions are compared and wavelet analysis layers are discussed. The result shows that the turbulent intensity in different scales gives the higher value during the intake process than that during the compression process. The turbulent intensity curves with different scales vary coincidently, indicating the coincident energy transformation. During the compression process, the turbulent intensity with ensemble method is larger than that with the wavelet analysis method.

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