Ultrafast high-repetition imaging of fuel sprays using picosecond fiber laser

Optics Express
Harsh PurwarA Hideur

Abstract

Modern diesel injectors operate at very high injection pressures of about 2000 bar resulting in injection velocities as high as 700 m/s near the nozzle outlet. In order to better predict the behavior of the atomization process at such high pressures, high-resolution spray images at high repetition rates must be recorded. However, due to extremely high velocity in the near-nozzle region, high-speed cameras fail to avoid blurring of the structures in the spray images due to their exposure time. Ultrafast imaging featuring ultra-short laser pulses to freeze the motion of the spray appears as an well suited solution to overcome this limitation. However, most commercial high-energy ultrafast sources are limited to a few kHz repetition rates. In the present work, we report the development of a custom-designed picosecond fiber laser generating ∼ 20 ps pulses with an average power of 2.5 W at a repetition rate of 8.2 MHz, suitable for high-speed imaging of high-pressure fuel jets. This fiber source has been proof tested by obtaining backlight images of diesel sprays issued from a single-orifice injector at an injection pressure of 300 bar. We observed a consequent improvement in terms of image resolution compared to standard white-ligh...Continue Reading

References

Feb 16, 2002·Science·Andrew G MacPheeJin Wang
Oct 8, 2004·Applied Optics·Megan Paciaroni, Mark Linne
Sep 17, 2009·Optics Letters·David SedarskyMark Linne
Jan 26, 2012·Optics Express·C LecaplainA Hideur
Oct 6, 2012·Optics Express·Martin BaumgartlAndreas Tünnermann
Jul 1, 2014·Optics Express·Harsh PurwarJean-Bernard Blaisot

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Citations

Sep 11, 2019·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Shengfu LiYan Ye

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