Vol. 74

Front:[PDF file] Back:[PDF file]
Latest Volume
All Volumes
All Issues
2018-10-11

Engineering Laser-Based Diagnostic in a Hot Wind Tunnel Jet: Measurement of the Temperature Structure Coefficient by Using an Optimization Technique

By Maurice Lamara, Elisabeth Ngo Nyobe, and Elkana Pemha
Progress In Electromagnetics Research M, Vol. 74, 93-103, 2018
doi:10.2528/PIERM18063003

Abstract

This paper is devoted to an engineering laser-based diagnostic technique which is able to extract the value of the temperature structure coefficient in a hot turbulent wind tunnel jet, by using a thin laser beam which is sent into the jet. Some experimental investigations are carried out to characterize the jet under study and the probabilities of the positions of the laser beam impact on a photocell are measured. The theoretical values of the same probabilities are computed by assuming that the laser beam direction is a Markov random process. By means of an optimization technique with constraints, based on the Golden Section algorithm, the temperature structure coefficient of the jet is determined. The validity of the result obtained is proved by a good agreement which is observed in the comparison between another parameter computed from that result and the previously published data.

Citation


Maurice Lamara, Elisabeth Ngo Nyobe, and Elkana Pemha, "Engineering Laser-Based Diagnostic in a Hot Wind Tunnel Jet: Measurement of the Temperature Structure Coefficient by Using an Optimization Technique," Progress In Electromagnetics Research M, Vol. 74, 93-103, 2018.
doi:10.2528/PIERM18063003
http://www.jpier.org/PIERM/pier.php?paper=18063003

References


    1. Monin, S. A. and A. M. Yaglom, Statistical Fluid Mechanics: Mechanics of Turbulence, MIT Press, Cambridge, 1975.

    2. Pemha, E. and E. Ngo Nyobe, "Genetic algorithm approach and experimental confirmation of a laser-based diagnostic technique for the local thermal turbulence in a hot wind tunnel jet," Progress In Electromagnetics Research B, Vol. 28, 325-350, 2011.
    doi:10.2528/PIERB10123102

    3. Comte-Bellot, G., "Hot-wire anemometry," Annual Review of Fluid Mechanics, Vol. 8, 1976.
    doi:10.1146/annurev.fl.08.010176.001233

    4. Bilong II, J., E. Ngo Nyobe, J. Hona, and E. Pemha, "Correlations of deflection angles of a laser beam in a hot turbulent jet of air: Theoretical determination and experimental measurement of the structure coefficient of refractive index fluctuations," Progress In Electromagnetics Research B, Vol. 42, 425-453, 2012.
    doi:10.2528/PIERB12050903

    5. Tatarskii, V. I., Wave Propagation in a Turbulent Medium, McGraw-Hill, NY, 1961.

    6. Ishimaru, A., Wave Propagation and Scattering in Random Media, Academic Press, NY, 1978.

    7. Chernov, L. A., Wave Propagation in a Random Medium, McGraw-Hill, NY, 1960.

    8. Pemha, E., B. Gay, and A. Tailland, "Measurement of the diffusion coefficient in a heated plane airstream," Physics of Fluids A, Vol. 5, No. 6, 1289-1295, 1993.
    doi:10.1063/1.858565

    9. Kiefer, J. H. and R. W. Lutz, "Simple quantitative schlieren technique of high sensitivity for shock tube densitometry," Physics of Fluids, Vol. 8, No. 7, 1393-1394, 1965.
    doi:10.1063/1.1761417

    10. Kiefer, J. H. and J. C. Hajduk, "Rate measurements in shock waves with the laser-schlieren technique," Proc. 12th Int. Symp. on Schock Waves and Tubes, A. lifshitz, J. Rom, ed., 97–110, Magnet Press, Jerusalem, 1980.

    11. Vanderplaats, G. N., Numerical Optimization Techniques for Engineering Design with Applications, McGraw-Hill, NY, 1984.

    12. Beck, J. V. and K. J. Arnold, Parameter Estimation in Engineering and Science, John Wiley and Sons, NY, 1977.

    13. Consortini, A., G. Fusco, F. Rigal, A. Agabi, and Y. Y. Sun, "Experimental verification of thinbeam wandering dependence on distance in strong indoor turbulence," Waves in Random Media, Vol. 7, 521-529, 1997.

    14. Ngo Nyobe, E., E. Pemha, J. Hona, J. Bilong II, and M. Lamara, "Measurement of the structure coefficient of refractive index fluctuations in a turbulent premixed butane-air flame by means of a laser-based interferometer technique," Optics and Lasers in Engineering, Vol. 59, 41-49, 2014.
    doi:10.1016/j.optlaseng.2014.02.009