High-Speed Infrared Measurement of Injector Tip Temperature during Diesel Engine Operation

Alex Gander, Dan Sykes, Raúl Payri, Guillaume de Sercey, Dave Kennaird, Martin Gold, Richard J. Pearson and Cyril Crua
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Alex Gander: Advanced Engineering Centre, University of Brighton, Brighton BN2 4GJ, UK
Dan Sykes: Advanced Engineering Centre, University of Brighton, Brighton BN2 4GJ, UK
Raúl Payri: CMT-Motores Térmicos, Universitat Politècnica de València, 46022 València, Spain
Guillaume de Sercey: Advanced Engineering Centre, University of Brighton, Brighton BN2 4GJ, UK
Dave Kennaird: Advanced Engineering Centre, University of Brighton, Brighton BN2 4GJ, UK
Martin Gold: BP Technology Centre, Pangbourne RG8 7QR, UK
Richard J. Pearson: BP Technology Centre, Pangbourne RG8 7QR, UK
Cyril Crua: Advanced Engineering Centre, University of Brighton, Brighton BN2 4GJ, UK

Energies, 2021, vol. 14, issue 15, 1-19

Abstract: Pre-catalyst engine emissions and detrimental injector deposits have been widely associated with the near-nozzle fluid dynamics during and after the injection events. Although the heating and evaporation of fuel films on the nozzle surface directly affects some of these processes, there are no experimental data for the transient evolution of nozzle surface temperature during typical engine conditions. In order to address this gap in knowledge, we present a non-intrusive approach for the full-cycle time resolved measurement of the surface temperature of production nozzles in an optical engine. A mid-wave infrared high-speed camera was calibrated against controlled conditions, both out of engine and in-engine to account for non-ideal in surface emissivity and optical transmissivity. A custom-modified injector with a thermocouple embedded below the nozzle surface was used to validate the approach under running engine conditions. Calibrated infrared thermography was then applied to characterise the nozzle temperature at 1200 frames per second, during motored and fired engine operation, thus revealing for the first time the effect of transient operating conditions on the temperature of the injector nozzle’s surface.

Keywords: mid-wave infrared (MWIR); fuel evaporation; engine load; idling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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