Combustion in a spark-ignition engine was investigated by means of the NACA high-speed motion-picture cameras. This camera is operated at a speed of 40,000 photographs a second and therefore makes possible the study of changes that take place in the intervals as short as 0.000025 second. When the motion pictures are projected at the normal speed of 16 frames a second, any rate of movement shown is slowed down 2500 times. Photographs are presented of normal combustion, of combustion from preignitions, and of knock both with and without preignition. The photographs of combustion show that knock may be preceded by a period of exothermic reaction in the end zone that persists for a time interval of as much as 0.0006 second. The knock takes place in 0.00005 second or less.


    Access

    Access via TIB

    Check availability in my library


    Export, share and cite



    Title :

    A High-Speed Motion-Picture Study of Normal Combustion, Knock and Preignition in a Spark-Ignition Engines


    Contributors:

    Publication date :

    1941-01-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English



    High-speed motion-picture study of normal combustion knock and preignition in spark-ignition engine

    Rothrock, A.M. / Spencer, R.C. / Miller, C.D. | Engineering Index Backfile | 1941


    A High-Speed Motion-Picture Study of Normal Combustion, Knock and Preignition in a Spark-Ignition Engine

    Rothrock, A. M. / Spencer, R. C. / Miller, C. D. et al. | British Library Conference Proceedings | 1989


    Knock in Spark Ignition Engines

    By, A. / Kempinski, B. / Rife, J. M. | SAE Technical Papers | 1981


    Knock in Spark Ignition Engines

    By,A. / Kempinski,B. / Rife,J.M. et al. | Automotive engineering | 1981


    Analysis of Combustion Knock Metrics in Spark-Ignition Engines

    Frankowski, Dave / Blough, Jason R. / Naber, Jeffrey et al. | SAE Technical Papers | 2006