Abstract
Measurements of in-cylinder mixture strength, during compression and combustion, were made on a natural gas engine using a novel fast-response flame ionization detector (FID). The Collings FID was found to be an effective instrument for measuring the spatial and temporal development of mixture strength in such engines. It is necessary when using the FID to establish suitably controlled bench tests to validate its pressure independence. Other parameters, such as the transit time and the frequency response of the instrument, may be confirmed by similar bench tests. A comparison is made between experimental measurements of mixture strength in the prechamber close to ignition and the results of a computational fluid dynamics (CFD) study of the mixing processes.
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