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Effects of Variable Valve Lift on In-Cylinder Air Motion

Author

Listed:
  • Tianyou Wang

    (Stake Key Lab of Engines, Tianjin University, Tianjin 300072, China)

  • Daming Liu

    (School of Automotive and Transportation, Tianjin University of Technology and Education, Tianjin 300222, China)

  • Gangde Wang

    (Stake Key Lab of Engines, Tianjin University, Tianjin 300072, China)

  • Bingqian Tan

    (Stake Key Lab of Engines, Tianjin University, Tianjin 300072, China)

  • Zhijun Peng

    (Stake Key Lab of Engines, Tianjin University, Tianjin 300072, China
    School of Engineering and Technology, University of Hertfordshire, Hatfield AL10 9AB, UK)

Abstract

An investigation into in-cylinder swirl and tumble flow characteristics with reduced maximum valve lifts (MVL) is presented. The experimental work was conducted in the modified four-valve optical spark-ignition (SI) test engine with three different MVL. Particle image velocimetry (PIV) was employed for measuring in-cylinder air motion and measurement results were analyzed for examining flow field, swirl and tumble ratio variation and fluctuating kinetic energy distribution. Results of ensemble-averaged flow fields show that reduced MVL could produce strong swirl flow velocity, then resulted in very regular swirl motion in the late stage of the intake process. The strong swirl flow can maintain very well until the late compression stage. The reduction of MVL can also increase both high-frequency and low-frequency swirl flow fluctuating kinetic energy remarkably. Regarding tumble flow, results demonstrate that lower MVLs result in more horizontal intake flow velocity vectors which can be easily detected under the valve seat area. Although the result of lower MVLs show a higher tumble ratio when the piston is close to the bottom dead centre (BDC), higher MVLs substantially produce higher tumble ratios which can be confirmed when most cylinder area lies in the measuring range.

Suggested Citation

  • Tianyou Wang & Daming Liu & Gangde Wang & Bingqian Tan & Zhijun Peng, 2015. "Effects of Variable Valve Lift on In-Cylinder Air Motion," Energies, MDPI, vol. 8(12), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:12:p:12397-13795:d:59966
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    Cited by:

    1. Wang, Guixin & Yu, Wenbin & Li, Xiaobo & Su, Yanpan & Yang, Rui & Wu, Wentao, 2019. "Study on dynamic characteristics of intake system and combustion of controllable intake swirl diesel engine," Energy, Elsevier, vol. 180(C), pages 1008-1018.
    2. Simona Silvia Merola & Adrian Irimescu & Silvana Di Iorio & Bianca Maria Vaglieco, 2017. "Effect of Fuel Injection Strategy on the Carbonaceous Structure Formation and Nanoparticle Emission in a DISI Engine Fuelled with Butanol," Energies, MDPI, vol. 10(7), pages 1-19, June.
    3. Santiago Martinez & Adrian Irimescu & Simona Silvia Merola & Pedro Lacava & Pedro Curto-Riso, 2017. "Flame Front Propagation in an Optical GDI Engine under Stoichiometric and Lean Burn Conditions," Energies, MDPI, vol. 10(9), pages 1-23, September.
    4. Yindong Song & Yiyu Xu & Xiuwei Cheng & Ziyu Wang & Weiqing Zhu & Xinyu Fan, 2022. "Using a Genetic Algorithm to Achieve Optimal Matching between PMEP and Diameter of Intake and Exhaust Throat of a High-Boost-Ratio Engine," Energies, MDPI, vol. 15(5), pages 1-17, February.
    5. Zhang, Wei & Chen, Zhaohui & Duan, Qiwang & Jiang, Qianyu, 2021. "Visual test and evolutionary analysis of flow fields in cylinder of helical intake port diesel engine," Energy, Elsevier, vol. 223(C).

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