Tumbling flow in a pentroof-type combustion chamber of an internal combustion engine

Yoshisuke Hamamoto, Eiji Tomita, Zhong Zhang

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    In a four-valve spark-ignition engine, the turbulence produced by tumbling gas motion plays an important role in promoting the combustion. In this study, the tumbling flow and its turbulence in cylinder were measured with LDV under the condition of no firing in changing with the parameters of piston stroke, compression ratio, configuration of the intake port and engine speed. Furthermore, the oil spot method was applied to observe the flow pattern on the piston surface near the top dead center (TDC) of the compression stroke. The main results are as follows : (1) The tumbling air motion is converted into several smaller eddies before the TDC, and this phenomenon contributes to the increase in the intensity and the degree of isotropy of turbulence near the TDC. (2) The experiments in changing the engine speed and stroke express clearly that the turbulence intensity increases linearly with increasing mean piston speed.

    Original languageEnglish
    Pages (from-to)974-980
    Number of pages7
    JournalTransactions of the Japan Society of Mechanical Engineers Series B
    Issue number559
    Publication statusPublished - 1993


    • Flow Visualization. Tumble
    • Gasoline Engine
    • Internal Combustion Engine
    • LDY
    • Spark Ignition Engine
    • Turbulence

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanical Engineering


    Dive into the research topics of 'Tumbling flow in a pentroof-type combustion chamber of an internal combustion engine'. Together they form a unique fingerprint.

    Cite this