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| NACA Report No. 727 ： ウィキペディア英語版 |
NACA Report No. 727
NACA Report No. 727 - A Study by High-speed Photography of Combustion and Knock in a Spark-ignition Engine was issued by the United States National Advisory Committee for Aeronautics in 1942. It contained the results of high-speed photographic investigation into knocking in a gasoline-fueled internal combustion engine.
==Summary==
The study of combustion in a spark-ignition engine given in NACA Report No. 704 has been continued. The investigation was made with the NACA high-speed motion-picture camera and the NACA optical engine indicator. The camera operates at the rate of 40,000 photographs a second and makes possible the study of phenomena occurring in time intervals as short as 0.000025 second.
Photographs are presented of combustion without knock and with both light and heavy knocks, the end zone of combustion being within the field of view. Time-pressure records covering the same conditions as the photographs are presented and their relations to the photographs are studied. Photographs with ignition at various advance angles are compared with a view to observing any possible relationship between pressure and flame depth.
A tentative explanation of knock is suggested, which is designed to agree with the indications of the high-speed photographs and the time-pressure records.
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