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  • Articles: DFG German National Licenses  (2)
  • 07.20Dt  (1)
  • Supersonic flow  (1)
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  • Articles: DFG German National Licenses  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Multi-line fluorescence imaging of the rotational temperature field in a shock-tunnel free jet (1996)
    Springer
    Applied physics 63 (1996), S. 167-178 
    Details
    ISSN: 1432-0649
    Keywords: 07.20Dt ; 47.40.Ki ; 33.50.Dj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A quasi-steady, highly underexpanded free jet of argon seeded with nitric oxide (NO) was generated at the exit of a converging, axisymmetric nozzle supplied by a shock-tunnel reservoir at 4200 K and 3.0 atm. During each run of the facility, an isolated transition in theA 2 Σ ←X 2 ∏ (0, 0) band of NO at ∼ 226 nm was pumped with a pulse of frequency-doubled dye laser light formed into a thin sheet and directed perpendicularly through the axis of the jet. The red-shifted components of the resulting fluorescence at 90° with respect to the laser were imaged onto an intensified, charge-coupled device array. A ratio of images obtained by exciting lines originating from two different rotational states could be used to infer the mean rotational temperature field. However, because of the extreme variations in temperature and density present in the free jet, no single pair of lines simultaneously provided adequate signal levels and temperature sensitivity over the flow's entire temperature range (i.e., ∼ 100–3100 K). Instead, a combination of images obtained with four different transitions was used. Excellent agreement was observed between multi-line temperature evaluations from single-shot and frame-averaged images and a numerical simulation of the flow performed by the method of characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01095269
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Shock tunnel flow visualization using planar laser-induced fluorescence imaging of NO and OH (1995)
    Springer
    Shock waves 4 (1995), S. 313-323 
    Details
    ISSN: 1432-2153
    Keywords: Flow visualization ; Supersonic flow ; Transient flow ; Shock tunnel ; Planar laser-induced fluorescence ; Shadowgraphy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract Temporal sequences of planar laser-induced fluorescence (PLIF) images of several high-speed, transient flowfields created in a reflection-type shock tunnel facility were acquired. In each case, the test gas contained either nitric oxide or the hydroxyl radical, the fluorescent species. The processes of shock reflection from an endwall with a converging nozzle and of underexpanded free jet formation were examined. A comparison was also made between PLIF imaging and shadow photography. The investigation demonstrated some of the capabilities of PLIF imaging diagnostics in complex, transient, hypersonic flowfields, including those with combustion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01413873
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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