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| Micro-shock waves generated inside a fluid jet impinging on plane wall | |
Jagadeesh G; Onodera O; Ogawa T; Takayama K; Jiang ZL(姜宗林) ; Jagadeesh, G (reprint author), Tohoku Univ, Shock Wave Res Ctr, Inst Fluid Sci, Sendai, Miyagi 9808577, Japan.
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| Source Publication | AIAA Journal
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| 2001 | |
| Volume | 39Issue:3Pages:424-430 |
| ISSN | 0001-1452 |
| Abstract | An Nd:glass laser pulse (18 ns, 1.38 J) is focused in a tiny area of about 100-mum diam under ambient conditions to produce micro-shock waves. The laser is focused above a planar surface with a typical standoff distance of about 4 mm, The laser energy is focused inside a supersonic circular jet of carbon dioxide gas produced by a nozzle with internal diameter of 2.9 mm and external diameter of 8 mm, Nominal value of the Mach number of the jet is around 2 with the corresponding pressure ratio of 7.5 (stagnation pressure/static pressure at the exit of the nozzle), The interaction process of the micro-shock wave generated inside the supersonic jet with the plane wall is investigated using double-pulse holographic interferometry. A strong surface vortex field with subsequent generation of a side jet propagating outward along the plane wail is observed. The interaction of the micro-shock wave with the cellular structure of the supersonic jet does not seem to influence the near surface features of the flowfield. The development of the coherent structures near the nozzle exit due to the upstream propagation of pressure waves seems to be affected by the outward propagating micro-shock wave. Mach reflection is observed when the micro-shock wave interacts with the plane wall at a standoff distance of 4 mm, The Mach stem is slightly deflected, indicating strong boundary-layer and viscous effects near the wall. The interaction process is also simulated numerically using an axisymmetric transient laminar Navier-Stokes solver. Qualitative agreement between experimental and numerical results is good. |
| Subject Area | 力学 |
| DOI | 10.2514/2.1352 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000167380900008 |
| WOS Keyword | LASER ; DAMAGE |
| WOS Research Area | Engineering |
| WOS Subject | Engineering, Aerospace |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/15927 |
| Collection | 力学所知识产出(1956-2008) |
| Corresponding Author | Jagadeesh, G (reprint author), Tohoku Univ, Shock Wave Res Ctr, Inst Fluid Sci, Sendai, Miyagi 9808577, Japan. |
| Recommended Citation GB/T 7714 | Jagadeesh G,Onodera O,Ogawa T,et al. Micro-shock waves generated inside a fluid jet impinging on plane wall[J]. AIAA Journal,2001,39,3,:424-430. |
| APA | Jagadeesh G,Onodera O,Ogawa T,Takayama K,姜宗林,&Jagadeesh, G .(2001).Micro-shock waves generated inside a fluid jet impinging on plane wall.AIAA Journal,39(3),424-430. |
| MLA | Jagadeesh G,et al."Micro-shock waves generated inside a fluid jet impinging on plane wall".AIAA Journal 39.3(2001):424-430. |
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