2024-03-29T06:23:04Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00003703
2022-12-15T03:36:47Z
423:424:425
453:454
Coherent Structures in a Fully Developed Stage of a Non-isothermal Round Jet
非等温円形噴流の発達領域における組織構造
非等温円形噴流の発達領域における組織構造
須藤, 仁
44786
松原, 幸治
44787
小林, 睦夫
44788
渡辺, 英人
44789
松平, 雄策
44790
Non-isothermal Round Jet
Coherent Structures
Fully Developed Stage
Direct Numerical Simulation
Experimental Visualization
Direct numerical simulation (DNS) was performed for a non-isothermal air jet of the Reynolds number equal to 1 200 in order to reveal coherent structures of the jet. Fourth-order central finite difference was applied to the simulation. Effort was also made for experimental visualization (dye mixing and PTV) supporting the validity of instantaneous structures by DNS. Computational results for two kind of inlet profiles suggested that nozzle conditions scarcely affect turbulent statistics and coherent structures in jet-established-stage. Two-point correlations of velocity and temperature show similar distributions denoting that temperature can be used as a indicator of a vortex. Conceptual model of hairpin-shape vortex was proposed and validated by the two-point correlations and the PDF analysis for vorticity alignment; the hairpin-shape vortex stands with legs inclined downstream, and the inclination angle and the tilting angle between two legs are -45° and 40°, respectively.
journal article
日本機械学会
2003-05
application/pdf
日本機械学会論文集. B編
681
69
1200
1207
日本機械学会論文集. B編
AN00187441
03875016
https://niigata-u.repo.nii.ac.jp/record/3703/files/9_0066.pdf
jpn
http://ci.nii.ac.jp/naid/110002388091
日本機械学会
本文データは学会の許諾に基づくCiNiiからの複製である