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• W1967096894 abstract "Over the last decade, a fundamental understanding of the chemical processes causing engine knock ininternal combustion engines was achieved. It was shown numerically that inhomogeneities of the temperature distribution in the end gas of an engine as small as 20–30 K can influence the onset of engine knock drastically. This phenomenon is called induced ignition by a “hot spot”. This paper reports on experiments to verify their existence and their predicted effect in a running spark ignition engine using realistic fuels. Due to the experimental error of available spectroscopic techniques, these small fluctuations in temperature cannot be detected directly. Using two-dimensional laser-induced fluorescence (2D-LIF) to monitor formaldehyde, which is formed early in an ignition process and is consumed before the comsumed before the combustion is completed, hot spots can be detected in the unburnt end gas. The experimental set-up is based on a one-cylinder two-stroke engine in which quartz windows allow optical access to the combustion chamber. An excimer-pumped dye laser is used to excite formaldehyde, and the fluorescence signal is observed using an intensified charge-coupled device (CCD) camera. From engine cycles under knocking conditions, a series of 2D-LIF frames is collected, showing theformation and consumption of formaldehyde in the end gas of the engine before the propagating regular flame front itself reaches this region. It is shown that engine knock starts with autoignition in small clearly bounded regions. The centres of autoignition are identified by the absence of formaldehyde within these regions due to its consumption during the ignition process." @default.
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• W1967096894 date "1994-01-01" @default.
• W1967096894 modified "2023-10-01" @default.
• W1967096894 title "Detection of hot spots in the end gas of an internal combustion engine using two-dimensional lif of formaldehyde" @default.
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• W1967096894 doi "https://doi.org/10.1016/s0082-0784(06)80637-5" @default.
• W1967096894 hasPublicationYear "1994" @default.
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