Author(s)

Yusuke Hirose¹, Kazuki Ishikawa¹, Yoshiyuki Ishimoto¹, Takumi Nagashima¹, Masanori Ota¹, Shinsuke Udagawa², Tatsuro Inage³, Kazuki Fujita³, Hideki Kiritani⁴, Koji Fujita⁴, Kiyonobu Ohtani⁴, Hiroki Nagai⁴

¹Graduate School of Engineering, Chiba University, Chiba, Japan.
²Aerospace Engineering Course, Tokyo Metropolitan College of Industrial Technology, Tokyo, Japan.
³Department of Mechanical Engineering, Shonan Institute of Technology, Fujisawa, Kanagawa, Japan.
⁴Institute of Fluid Science, Tohoku University, Sendai, Miyagi, Japan.

Three-dimensional density measurement of unsteady flow field around a sphere is carried out in the ballistic range at Institute of Fluid Science, Tohoku University. Simultaneous multi-angle measurement system using twelve digital cameras is installed in the test chamber of the ballistic range to achieve the three-dimensional density measurement. The Colored-Grid Background Oriented Schlieren (CGBOS) technique using colored-grid background is utilized for the reconstruction of density. The Mach number of the sphere is set to 1.5. The short pulse LEDs to illuminate the backgrounds are also installed in the chamber to capture the unsteady flow field around a flying sphere. Three-dimensional density distribution around a sphere is successfully reconstructed.

Background Oriented Schlieren, Flow Visualization, High Speed Flows, Unsteady Flow, Simultaneous Measurement

Hirose, Y. , Ishikawa, K. , Ishimoto, Y. , Nagashima, T. , Ota, M. , Udagawa, S. , Inage, T. , Fujita, K. , Kiritani, H. , Fujita, K. , Ohtani, K. and Nagai, H. (2019) The Quantitative Density Measurement of Unsteady Flow around the Projectile. Journal of Flow Control, Measurement & Visualization, 7, 111-119. doi: 10.4236/jfcmv.2019.72009.