Experimental study of free-convection flame propagation

Abstract

The results of studying the burnout of diffusion jets flowing into stationary atmosphere in laminar, transitional and turbulent flows with the direction of the initial pulse in the range of angles α from 0° to 360° relative to the vertical are presented in the paper. Experimental data on the values of relative curvilinear flame length, its projections on the axes Ox, Oy, the coordinates of the flame stabilization point in the range of Reynolds numbers from = 500 to Re = 15000 as functions of angle α are obtained. The experimental data are presented in the form of characteristic curves and summarized as criteria equations that take into account the effect of free convection in the framework of the theory of jet torch burning on the position of the flame front, the geometry and volume of the combustion zone The results of photographing the process of jet combustion are presented. Recommendations on how to improve the combustion efficiency and the choice of optimal primary, geometrical and thermal parameters of the jet (Re number, Fr number, the relative length of the jet, the initial diameter of the jet, the position of the flame stabilization point, the angle relative to vertical) are given, and the thermophysical characteristics of diffusion reacting gas jet formation with account of free convection are shown.

About the authors

O. A. Yevdokimov

P.A. Soloviev Rybinsk State Aviation Technical University, Rybinsk

Author for correspondence.
Email: yevdokimov_oleg@mail.ru

Candidate of Science (Engineering), Associate Professor

Russian Federation

A. I. Guryanov

P.A. Soloviev Rybinsk State Aviation Technical University, Rybinsk

Email: marialex2004@mail.ru

Doctor of Science  (Engineering), Professor

Russian Federation

References

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  2. Polezhaev Yu.V., Mostinskiy I.L., Gabbasova G.V. Diffusion combustion of gas jets in laminar and turbulent modes. Proceedings of the Fourth Russian National Conference on Heat Transfer. In 8 volumes. V. 3. Moscow: MPEI Publ., 2006. P. 297-300. (In Russ.)
  3. Gebhart B., Dzhaluriya J, Mahajan R., Sammak B. Svobodno konvektivnye techeniya, teplo- i massoobmen [Free-convection flows, heat and mass transfer. V. 1]. Moscow: Mir Publ., 1981. 678 p.
  4. Schetinkov Ye.S. Fizika goreniya gazov [Physics of gas combustion]. Moscow: Nauka Publ., 1965. 740 p.
  5. Yevdokimov O.A., Guryanov A.I. Research on born-out dynamics in GTE combustion chambers and other devices of power-production nature. Vestnik RGATU imeni P.A. Solov'eva. 2013. №4 (27). P. 36-42. (In Russ.)

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