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|Title:||Investigation of Spray Angle Measurement Techniques|
|Keywords:||Diesel engines;fossil fuels;image processing;spray angle measurement|
|Abstract:||The in-cylinder ﬂuid-dynamic processes of fuel injection and air entrainment inﬂuence the structure and shape of evolving fuel sprays, which can subsequently alter the ignition, combustion and pollutant formation processes in diesel engines. Different spray angle detection methods have been used in the literature to investigate the global and local spray characteristics. In this work, the ﬁve most widely used diesel spray angle detection methods were identiﬁed, and used to evaluate the characteristic features of each detection method: methods with a detection range based on the spray penetration length, methods with a ﬁxed detection range in the near and far-ﬁeld spray region, triangular-based methods, and methods based on averaging local data points. The sprays were acquired from our spray chamber and processed with different thresholding techniques to explore the differences between spray angle detection methods. All ﬁve methods generated a similar global trend of spray angle variation for temporally evolving sprays over the complete injection period. However, the actual spray angle values detected by each method were not always comparable. The differences in spray angle values between the different detection methods were larger during the early start of injection, and these differences systematically decreased as the spray approached a steady-state. The methods that detected the angle in the far-ﬁeld demonstrated lower spatiotemporal variability when compared to the methods that detected the angle in the near-ﬁeld. An assessment ofthecomparabilitybetweenangledetectionmethodswasmadeandtheoutcomeprovidesguidanceforthe selection of the spray angle detection method.|
|Appears in Collections:||Publications|
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