High-speed visualization of fuel spray impingement in the near-wall region using a DISI injector

N. Kawahara; K. Kintaka; E. Tomita

doi:10.1117/12.2270691

20 February 2017 High-speed visualization of fuel spray impingement in the near-wall region using a DISI injector

N. Kawahara, K. Kintaka, E. Tomita

Proceedings Volume 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics; 1032817 (2017) https://doi.org/10.1117/12.2270691
Event: 31st International Congress on High-Speed Imaging and Photonics, 2016, Osaka, Japan

Abstract

We used a multi-hole injector to spray isooctane under atmospheric conditions and observed droplet impingement behaviors. It is generally known that droplet impact regimes such as splashing, deposition, or bouncing are governed by the Weber number. However, owing to its complexity, little has been reported on microscopic visualization of poly-dispersed spray. During the spray impingement process, a large number of droplets approach, hit, then interact with the wall. It is therefore difficult to focus on a single droplet and observe the impingement process. We solved this difficulty using high-speed microscopic visualization. The spray/wall interaction processes were recorded by a high-speed camera (Shimadzu HPV-X2) with a long-distance microscope. We captured several impinging microscopic droplets. After optimizing the magnification and frame rate, the atomization behaviors, splashing and deposition, were recorded. Then, we processed the images obtained to determine droplet parameters such as the diameter, velocity, and impingement angle. Based on this information, the critical threshold between splashing and deposition was investigated in terms of the normal and parallel components of the Weber number with respect to the wall. The results suggested that, on a dry wall, we should set the normal critical Weber number to 300.

Citation Download Citation

N. Kawahara, K. Kintaka, and E. Tomita "High-speed visualization of fuel spray impingement in the near-wall region using a DISI injector", Proc. SPIE 10328, Selected Papers from the 31st International Congress on High-Speed Imaging and Photonics, 1032817 (20 February 2017); https://doi.org/10.1117/12.2270691

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KEYWORDS

Visualization

Image processing

Microscopes

Cameras

High speed cameras

Liquids

Surface roughness

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