The use of gasoline in homogeneous charge compression ignition engines (HCCI) and in duel fuel diesel-gasoline engines, has increased the need to understand its compression ignition processes under engine-like conditions. Recognizing that these processes need to be studied under well-controlled conditions in order to quantify low temperature heat release and to provide fundamental validation data for chemical kinetic models, an autoignition investigation has been undertaken in a rapid compression machine (RCM) to measure the ignition response of gasoline/air mixtures over a wide range of compression temperatures and for different compression pressures. Results from the RCM experiments are also simulated using a four-component gasoline surrogate model which includes n-heptane, iso-octane, toluene, and 2-pentene. For the conditions investigated, fairly good agreement between the experiments and the four-component surrogate model in terms of first-stage (when observed) and overall ignition delay times is demonstrated.
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