An experiment has been designed to directly measure the oxidation of hydrocarbons emerging into the burned gases after flame passage. The main feature of the experiment is to isolate a source of unburned hydrocarbons by continuously doping the lubricant oil with a liquid hydrocarbon species, while firing the engine using hydrogen as a fuel. The dopant hydrocarbon desorbs into the cylinder and is the only source of carbon in the exhaust. The extent of oxidation can then be determined by comparing the remaining amount of hydrocarbons in the exhaust to the total carbon. The hydrocarbon source in these experiments was quantified as a first step in interpreting oxidation results and extrapolating them to the post-flame oxidation of unburned hydrocarbons in a gasoline-fired engine.
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