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Experimental investigation of swirl motion of in-cylinder flow in CI engine under firing condition due to preinjection using PIV and POD techniques

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Abstract

The swirling motion of the intake air creates a flow field within the engine’s cylinder, which enhances the mixing of air and fuel, as well as combustion and emissions. Moreover, swirl formations in the cylinder and their subsequent breakdown into turbulence kinetic energy reflect the importance of in-cylinder flow structures. This study combined the PIV technique with the POD method to investigate the velocity fields in a single-cylinder diesel engine. The experiments were conducted at various pressure conditions and different engine rpm. Based on the obtained results, the average flow velocities from expansion to exhaust strokes were reduced in comparison with intake strokes. In all engine pressure and speed conditions, compression and exhaust strokes showed a significant change in flow patterns with changes in pressure and speed. At various crank angles, the POD modes demonstrated flow properties of the swirling motion, along with a dissimilarity feature and evolution of the in-cylinder flow.

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Data availability

The authors confirm that the data supporting the findings of this study are available within the article [and/or] its supplementary materials.

Abbreviations

PIV:

Particle image velocimetry

POD:

Proper orthogonal decomposition

CFD:

Computational fluid dynamics

CA deg.:

Crank-angle degree

Nd: YAG:

Neodymium-doped yttrium aluminum garnet

Rpm:

Revolutions per minute

deg. ATDC:

Degrees after top-dead center

TKE:

Turbulent kinetic energy

2D:

Two dimensional

3D:

Three dimensional

SiO2 :

Silicon dioxide

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Authors and Affiliations

  1. Graduate School of Science and Technology, Sophia University, 7-1 Kioi-Cho, Chiyoda-Ku, Tokyo, 102-8554, Japan

    Saad Aljarf

  2. Department of Engineering and Applied Sciences, Sophia University, 7-1 Kioi-Cho, Chiyoda-Ku, Tokyo, 102-8554, Japan

    Mitsuhisa Ichiyanagi & Takashi Suzuki

  3. Turbulence and Energy Laboratory, Ed Lumley Center of Engineering Innovation, University of Windsor, Windsor, Ontario, N9B 3P4, Canada

    Hardeep Singh

  4. Department of Mechanical Engineering, TKM College of Engineering Karicode, TKMCE PO, Kollam, Kerala, 691005, India

    V. Baiju

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  1. Saad Aljarf
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  2. Hardeep Singh
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  3. V. Baiju
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  4. Mitsuhisa Ichiyanagi
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  5. Takashi Suzuki
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Contributions

Sample Credit Author Statement SA: Methodology, Software, Writing. HS: Editing and supervision. VB: Data Curation. MI: Reviewing and Leading. TS: Supervision, Advising. All authors reviewed the manuscript.

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Correspondence to Saad Aljarf.

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Aljarf, S., Singh, H., Baiju, V. et al. Experimental investigation of swirl motion of in-cylinder flow in CI engine under firing condition due to preinjection using PIV and POD techniques. Automot. Engine Technol. 8, 73–93 (2023). https://doi.org/10.1007/s41104-023-00126-y

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