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Volume 20 Issue 6
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Citation:
shu

Real time visualization and quantitative measurement of rocket exhausted plumes field

  • 1.

    Dept.of Appl.Phys., Nanjing University of Science and Technology

  • Received Date: 1995-07-21
    Accepted Date: 1995-07-21
  • A new technique of real time visualizing and quantitatively measuring of rocket exhausted plume field is presented in this paper.The beam source is a He-Ne laser and a alignment optical system to provide a parallel light beam 300mm in diameter. Then the parallel light beam goes through the plume field and two 20line/mm Ronchi gratings to obtain a diffraction pattern,and the pattern imaged at a CCD sensor to display on a monitor and been recorded.By means of image computer processing and Gladstone-Dale formula,with the parameters of grating index P,shift of more fringe,interval of more fringe,and interval of two gratings,the density distribution of the plume field can calculated.
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    Harshbarger F.Further experimental and theoretical studies of underexpanded jets near mach disc.1964:A D-44088
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    Lian W Y,Xhang F X.The structure and properties of underexpanded exhaust jets.International symposium on defiend flow modelling and turbulence measurement.Iowa City,USA,1985:Sep A 12,16~18
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    He A Zh,Yan D P.Opt Engng,1988;10(27):941~945
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    Bar-Zir E,Glatt E,Kafrl O I.Appl Opt,1981;24(10):4263~4266
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    Bar-Zir E,Sgnlion S,Kafri O,Appl Opt,1983;22(5):698~725
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    Goulard R.Combustion Measurement.New York:Academic Press,1976:226~244
    [7] 阎大鹏,朱兆青,鲁江陵 et al.光学学报,1993;13(5):439~443
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Real time visualization and quantitative measurement of rocket exhausted plumes field

  • 1. Dept.of Appl.Phys., Nanjing University of Science and Technology
  • Received Date: 1995-07-21
  • Accepted Date: 1995-07-21
  • Available Online: 1996-11-25

Abstract: A new technique of real time visualizing and quantitatively measuring of rocket exhausted plume field is presented in this paper.The beam source is a He-Ne laser and a alignment optical system to provide a parallel light beam 300mm in diameter. Then the parallel light beam goes through the plume field and two 20line/mm Ronchi gratings to obtain a diffraction pattern,and the pattern imaged at a CCD sensor to display on a monitor and been recorded.By means of image computer processing and Gladstone-Dale formula,with the parameters of grating index P,shift of more fringe,interval of more fringe,and interval of two gratings,the density distribution of the plume field can calculated.

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