Optical Engine Operation to Attain Piston Temperatures Representative of Metal Engine Conditions

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Event
WCX™ 17: SAE World Congress Experience
Authors Abstract
Content
Piston temperature plays a major role in determining details of fuel spray vaporization, fuel film deposition and the resulting combustion in direct-injection engines. Due to different heat transfer properties that occur in optical and all-metal engines, it becomes an inevitable requirement to verify the piston temperatures in both engine configurations before carrying out optical engine studies. A novel Spot Infrared-based Temperature (SIR-T) technique was developed to measure the piston window temperature in an optical engine. Chromium spots of 200 nm thickness were vacuum-arc deposited at different locations on a sapphire window. An infrared (IR) camera was used to record the intensity of radiation emitted by the deposited spots. From a set of calibration experiments, a relation was established between the IR camera measurements of these spots and the surface temperature measured by a thermocouple. Transmissivity of the chromium spot was investigated by using different background media. The deviations between the thermocouple readings and SIR-T measured temperatures were noted to be within 10°C for the working range of 75°C to 180°C. The technique was demonstrated to measure the optical piston temperature during engine operation at 1500 rpm and 2000 rpm. A piston warm-up strategy was implemented for optical engine studies to attain metal engine steady state piston temperatures. The effect of piston warm-up on in-cylinder soot formation was studied using high-speed imaging.
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DOI
https://doi.org/10.4271/2017-01-0619
Pages
11
Citation
Vedula, R., Stuecken, T., Schock, H., Squibb, C. et al., "Optical Engine Operation to Attain Piston Temperatures Representative of Metal Engine Conditions," SAE Int. J. Engines 10(3):767-777, 2017, https://doi.org/10.4271/2017-01-0619.
Additional Details
Publisher
Published
Mar 28, 2017
Product Code
2017-01-0619
Content Type
Journal Article
Language
English