An experimental study of a bidirectional vortex combustor with two-stage air supply


Аuthors

Evdokimov O. A.*, Guryanov A. I., Veretennikov S. V., Muhommedov U. P., Shaykina A. A.

Rybinsk State Aviation Technical University named after P.A. Soloviev, RSATU, 53, Pushkin St., Rybinsk, Yaroslavl region, 152934, Russia

*e-mail: yevdokimov_oleg@mail.ru

Abstract

The article proposes organization of a new scheme of burning in the counterflow swirling flow based on stepped air feeding. The said scheme was realized in the form of vortex counterflow burning module running of gas fuel. Experimental studies of both stalling and emission characteristics of the burner module were conducted. The results revealed that feeding air feeding into the unit through the main and additional tangential channels led to the opposite effects. Reynolds number increasing of the secondary flow ensured safe operating area enhancing, while Reynolds number increasing of the primary air was being characterized by the excess air coefficient reduction corresponding to the flame stalling. Generalization of the results within the framework of the parameter characterizing the air consumptions interrelation n, revealed that the largest values of the integral excess air coefficient aΣ were being reached within the range of 0.4 ≤ n ≤ 1.0. Emission characteristics of the burner module with the stepped feeding are closer to those existing for the classical counterflow units. Maximum values of nitrogen dioxides emission are being observed near the stoichiometry, and the area of the lowest carbon dioxide emission corresponds to the depleted air-fuel mixtures. The more ecologically rational is the burner module operation organizing within the excess air coefficient range of 1.8 ≤ aΣ ≤ 2.0

Keywords:

swirled flow, vortex bidirectional burner, stepped air feeding, propane, flame blow-off, pollutants emission

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