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Photogallery

3D Printing of Spark-Ignited Flame Kernels, Experimentally Captured by 3D-Computer Tomography and Multi-Directional Schlieren Photography

[+] Author and Article Information
Yojiro Ishino

Nagoya Institute of Technology, Nagoya, Japan
ishino@nitech.ac.jp

Naoki Hayashi

Nagoya Institute of Technology, Nagoya, Japan
0rm2jx067231z5k@ezweb.ne.jp

Yuta Ishiko

Nagoya Institute of Technology, Nagoya, Japan
f145gto@gmail.com

Kimihiro Nagase

Nagoya Institute of Technology, Nagoya, Japan
hamhiro555@gmail.com

Kazuma Kakimoto

Nagoya Institute of Technology, Nagoya, Japan
k.kazuma.santa@hotmail.co.jp

Ahmad Zaid Nazari

Nagoya Institute of Technology, Nagoya, Japan
a.zaid786@gmail.com

Yu Saiki

Nagoya Institute of Technology, Nagoya, Japan
saiki.yu@nitech.ac.jp

1Corresponding author.

J. Heat Transfer 139(2), 020913 (Jan 06, 2017) Paper No: HT-16-1726; doi: 10.1115/1.4035583 History: Received November 07, 2016; Revised November 24, 2016

Abstract

Non-scanning 3D-CT(Computer Tomography) technique employing a multi-directional quantitative schlieren photographic system with flash light source, has been performed to obtain instantaneous density distributions of spark-ignited laminar / turbulent flame kernels. For simultaneous schlieren photography, the custom-made 20-directional schlieren camera was constructed and used. The concept of the multi-directional shclieren system is shown in top-right figure. Each quantitative schlieren optical system, indicated in top-left figure, is characterized by a rectangular-shaped right source with uniform luminosity. Middle-left picture gives the appearance of the multi-directional schlieren camera. The flame kernels are made by spark ignition for a fuel-rich propane-air premixed gas (flow velocity :1.0 m/s, equivalence ratio :1.4 ). Spark electrodes of 0.4 mm diameter with 1.0 mm gap are used. First, development of laminar flame kernel is indicated in high-speed images of middle-right figure. 3D printed model of the CT reconstruction result (left in bottom-left photograph) shows the spherical shape of flame kernel with a pair of deep wrinkles. The wrinkle is considered to be caused by spark electrodes. Next turbulent flame kernel behind turbulence promoting grid is selected (turbulence intensity 0.26 m/s). The high-speed images of bottom-right figures show corrugated flame shape. 3D model of CT result (right in bottom-left photo.) expresses the instantaneous 3D turbulent flame kernel shapes. These 3D solid models based on 3D-CT reconstructed data of 2 ms, are 3D-printed as 2 times large size for threshold density level of 0.7 kg/m3.

Copyright (c) 2017 by ASME
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