Analysis of ignition and flame geometric characteristics of lubricating oil leaking from automotive engine onto hot surfaces.

At a hot surface temperature of 400°C, when the single-injection oil volume is 0.1–0.3 ml, the ignition delay time shows an increasing trend.

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The main findings of this study are as follows: (1) As the temperature of the hot surface increases, the ignition delay time generally shows a decreasing trend, with 450°C being a critical turning point; (2) There is an overlap between ignition and non-ignition cases within a specific range, forming a possible ignition zone, and the R 2 values of the fitting equations for the upper and lower boundaries are both above 95%, indicating a good fit.

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