The frequency spectral structure of turbulence spatial components was investigated in the cylinder of an automotive diesel engine with a high-squish reentrant in-piston bowl of the conical type and a helical inlet port.A sophisticated HWA technique using single- and dual-sensor probes was applied for instantaneous air velocity measurements along the injector axis at practical engine speeds, up to 3000 rpm, under motored conditions. The investigation was carried out for both cycle-resolved and conventional turbulence components, as were determined by different wire orientations, throughout the induction, the compression and the early stage of the expansion stroke.The anisotropy of turbulence spectral structure and its temporal evolution during the engine cycle were examined by evaluating the autospectral density functions and the time scales of each turbulence component in consecutive correlation crank-angle intervals.The contribution of high- and low-frequency parts was resolved in the autospectrum of the conventional fluctuating motion. The cutoff frequency between these parts was thus estimated and insight into its dependence on the engine speed was given for the different turbulence components.


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    Title :

    Turbulence Spectrum Investigation in a DI Diesel Engine with a Reentrant Combustion Bowl and a Helical Inlet Port


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    1996 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1996



    Publication date :

    1996-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Turbulence Spectrum Investigation in a DI Diesel Engine with a Reentrant Combustion Bowl and a Helical Inlet Port

    Catania, A. E. / Dongiovanni, C. / Mittica, A. et al. | British Library Conference Proceedings | 1996


    Turbulence spectrum investigation in a DI Diesel engine with a reentrant combustion bowl and a helical inlet port

    Catania,A.E. / Dongiovanni,C. / Mittica,A. et al. | Automotive engineering | 1996


    Investigation of the helical inlet port

    Wang,S.F. / Milton,B.E. / Shanghai Diesel Engine,CN et al. | Automotive engineering | 1998


    Investigation of the Helical Inlet Port

    Milton, B. E. / Wang, S. F. | SAE Technical Papers | 1998


    Investigation of the Helical Inlet Port

    Wang, S. F. / Milton, B. E. / SAE | British Library Conference Proceedings | 1998