Quantitative CT density field measurement in unsteady supersonic flow by colored grid background oriented schlieren (CGBOS) method

2015 Fiscal Year Final Research Report

• Project/Area Number: 25249122
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Aerospace engineering
• Research Institution: Kisarazu National College of Technology (2014-2015); Chiba University (2013)
• Principal Investigator: Maeno Kazuo 木更津工業高等専門学校, その他部局等, 校長 (30133606)
• Co-Investigator(Kenkyū-buntansha): OHTA Masanori 千葉大学, 工学研究科, 准教授 (60436342) ; TAKEI Masahiro 千葉大学, 工学研究科, 教授 (90277385)
• Research Collaborator: Leopold F. French-German Research Institute ; Ibrahim M. S. Indian Institute of Science
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 航空宇宙工学 / 超音速流 / 噴流ー超音速流干渉 / 3次元非定常衝撃波計測 / 背景指向シュリーレン法 / BOS-CT法 / ４次元密度場定量画像計測 / 超音速風洞流れ

Outline of Final Research Achievements

In the supersonic flow research, the flow visualization has been developed by such qualitative methods as shadowgraph, schlieren method, or interferometry. As compared with these methods, new diagnostic technology is dramatically developing together with digital image instruments and high-power PC. Above all, computed tomography (CT) of unsteady supersonic density flow field with shock waves is rapid-developing diagnostics. The hardware and software/algorithm for optical CT should be investigated. In our research, the density field measurement was developed by CT with Mach-Zehnder interferometry (LICT) for unsteady discharging shock wave and vortex, and also the density gradient measurement by CT with background oriented shclieren method of colored-grid background (CGBOS) in JAXA-ISAS supersonic wind tunnel. Furthermore, the novel time-developing three-dimensional CT (4D-CT) experiments of LICT and CGBOS with high-speed camera are succesfully studied.

Free Research Field

航空宇宙工学