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  • 1
    Electronic Resource
    Electronic Resource
    A study of CARS nitrogen thermometry at high pressure (1990)
    Springer
    Applied physics 51 (1990), S. 31-38 
    Details
    ISSN: 1432-0649
    Keywords: 42.65c ; 78.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The accuracy of CARS N2 thermometry has been assessed using carefully measured experimental data at high pressures for the temperature range 295 to 870 K and pressure range 1–20 bar. Excellent agreement between calculated and experimental spectra was achieved using statistically based fitting laws to model rotational relaxation. Temperature errors of within ±60 K were achieved using the MEG fitting law, and within ±30 K using an extension to the model (XMEG). Results of separate ab initio IOS calculations with ECS corrections for rotational relaxation gave good overall agreement but did not model the structure of the motionally narrowed spectra as well as the empirical models. The various models were also compared with some complementary data measured by DLR, Stuttgart in their high pressure burner for pressures up to 40 bar. This study also investigated the sensitivity of CARS thermometry to pressure; in certain regions a significant reduction in sensitivity was found. Other key factors investigated include nonlinearities in the intensified diode array detector.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332321
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    Paper (German National Licenses)
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    A Reattaching Free Shear Layer in Compressible Turbulent Flow: A Comparison of Numerical and Experimental Results (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An investigation of the two-dimensional, free turbulent shear layer reattaching on an inclined surface at Mach 2.92 and at a high Reynolds number is described. The test geometry is specifically designed to isolate the reattachment process of a high-speed separated flow. A numerical solution of the time-dependent, Reynolds-averaged, Navier-Stokes equations for the entire flow field, employing a two-equation eddy viscosity turbulence model, is presented. Detailed comparisons of prediction and experiment are made in the free shear layer, at reattachment, and in the developing boundary layer downstream. These comparisons include mean surface quantities as well as mean and fluctuating flow-field quantities. Although the overall features of this complex flow field are predicted, there are several deficiencies in the numerical solution, particularly in the region downstream of reattachment. Modifications of the turbulence model to correct these deficiencies are discussed.
    Keywords: Fluid Mechanics and Heat Transfer
    Type: NASA/TM-1981-207525 , NAS 1.15:207525 , AIAA Paper 81-0333 , Aerospace Sciences Meeting; Jan 12, 1981 - Jan 15, 1981; Saint Louis, MO; United States
    Format: application/pdf
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