Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)
- Volume 11 Issue 6
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- Pages.749-757
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- 1999
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- 1229-6422(pISSN)
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- 2465-7611(eISSN)
Holographic interferometric tomography for reconstructing a three- dimensional flow field
3차원 유동장 측정용 홀로그래피 간섭토모그래피
Abstract
Holographic interferornetric tomography can provide reconstruction of instantaneous three dimensional gross flow fields. The technique however confronts ill-posed reconstruction problems in practical applications. Experimental data are usually limited in projection and angular scanning when a field is captured instantaneously or under the obstruction of test models and test section enclosures. An algorithm, based on a series expansion method, has been developed to improve the reconstruction under the ill-posed conditions. A three-dimensional natural convection flow around two interacting isothermal cubes is experimentally investigated. The flow can provide a challenging reconstruction problem and lend itself to accurate numerical solution for comparison. The refractive index fields at two horizontal sections of the thermal plume with and without an opaque object are reconstructed at a limited view angle of 80" The experimental reconstructions are then compared with those from numerical calculation and thermocouple thermometry. It confirms that the technique is applicable to reconstruction of reasonably complex, three-dimensional flow fields.elds.
Keywords
- Three-dimensional flow fields;
- Flow diagnostics;
- Quantitative visualization;
- Holography inteferometric tomography;
- Ill-posed reconstruction
- 3차원 유동장;
- 유체계측;
- 정량적 가시화;
- 홀로그래피 간섭토모그래피;
- 불량 재현;