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High-speed digital visualization and high-frequency automated shock tracking in supersonic flows
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Timmerman, B. H. (Brenda H.), Skeen, A. J., Bryanston-Cross, P., Tucker, Paul G., Jefferson-Loveday, R. J., Paduano, James and Guenette, G. R. (2008) High-speed digital visualization and high-frequency automated shock tracking in supersonic flows. Optical Engineering, Vol.47 (No.10). Article No. 103201 . doi:10.1117/1.2992621
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Official URL: http://dx.doi.org/10.1117/1.2992621
Abstract
A low-cost, robust, versatile digital shadowgraph visualization system is presented that provides a fast nonintrusive diagnostic for unsteady high-speed flows. The technique is particularly designed for real-time automated tracking of shock positions, enabling high-speed active shock control. The visualization system is based on a high-intensity white LED light source combined with a CMOS-imaging sensor, providing the system with three modes of operation: (1) high-resolution overall instantaneous visualization; (2) high-resolution visualization showing spatial- temporal variations in the flow field, allowing direct identification of areas where changes occur; (3) adjustable windowed visualization at reduced resolution at high frame rate (currently up to 980 Hz) . Experimental results are presented together with numerical simulations based on the high-accuracy NTS Navier-Stokes solver and Roe's flux difference splitting method. The flow studied is an adjustable underexpanded jet flow coming from a nozzle that is placed in a counterflowing Mach-2 flow. The interaction of the two flows results in a complex shock and expansion pattern, providing a challenging configuration for the numerical flow solver. By modulating the jet, high-frequency changes are induced in the interaction pattern, allowing simulation of shock movement in a supersonic inlet. Good correspondence between measured and numerical shock position and angle isfound. (C) 2008 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.2992621]
| Item Type: | Journal Article | ||||
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| Subjects: | Q Science > QC Physics T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science > Engineering | ||||
| Library of Congress Subject Headings (LCSH): | Flow visualization, Aerodynamics, Supersonic, Metal oxide semiconductors, Complementary, Photography, High-speed, Compressibility | ||||
| Journal or Publication Title: | Optical Engineering | ||||
| Publisher: | S P I E - International Society for Optical Engineering | ||||
| ISSN: | 0091-3286 | ||||
| Official Date: | October 2008 | ||||
| Dates: |
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| Volume: | Vol.47 | ||||
| Number: | No.10 | ||||
| Number of Pages: | 8 | ||||
| Page Range: | Article No. 103201 | ||||
| DOI: | 10.1117/1.2992621 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Open Access | ||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), Warwick Innovative Manufacturing Research Centre (WIMRC), United States. Defense Advanced Research Projects Agency (DARPA), European Commission (EC) | ||||
| Grant number: | HPMFCT2000-00997 (EC), RESCM9002 (WIMRC) |
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