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Analysis of spark-ignition engine knock as seen in photographs taken at 200,000 frames per second (Document No: 19930093250)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Copyright Year | 1946 |
| Description | A motion picture of the development of knock in a spark-ignition engine, is presented, which consists of 20 photographs taken at intervals of 5 microseconds, or at a rate of 200,000 photographs a second, with an equivalent wide-open exposure time of 6.4 microseconds for each photograph. A motion picture of a complete combustion process, including the development of knock, taken at the rate of 40,000 photographs a second is also presented to assist the reader in orienting the photographs of the knock development taken at 200,000 frames per second. The photographs taken at 200,000 frames per second are analyzed and the conclusion is made that the type of knock in the spark-ignition engine involving violent gas vibration originates as self-propagating disturbance starting at a point in the.burn1ig or autoigniting gases and spreading out from that point through the incompletely burned gases at a rate as high as 6800 feet per second, or about twice the speed of sound in the burned gases. Apparent formation of free carbon particles in both the burning and the burned gas is observed within 10 microseconds after passage of the knock disturbance through the gases. |
| File Size | 3271931 |
| Page Count | 24 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19930093250 |
| Archival Resource Key | ark:/13960/t4rj8sb65 |
| Language | English |
| Publisher Date | 1946-01-01 |
| Access Restriction | Open |
| Subject Keyword | Cameras-naca (moving Picture)(high Speed) Engines, Spark-ignition Photography-combustion-naca Schlieren Method (moving-picture)(high-speed) Detonation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
