Experimental study of combustion in the systems of inverted diffusion jets with swirl


Аuthors

Evdokimov O. A.*, Zhizhin E. V.

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 considers specifics of combustion in the arrays of inverted jets with swirl, which rep- resent coaxial fuel flow (along the periphery) and air flow (along the axis) with the swirl of the latter and form a diffusion flame with partial mixing at the initial section. The results revealed that the main factor determining the combustion intensity in the individual inverted jet is the effluence mode of its air component. Interaction of elementary flows between each other additionally significantly effects, in case combustion organizing of such jets array. It manifests most strongly in the fuel-rich area by the value of excess-air factor α < 1. Besides, com- bustion stability in the inverted jets array increases by the value up to 20 %, which allows increasing thermo- dynamic efficiency of the fuel-firing arrangements and their weight and size reduction.

Keywords:

swirling flow, inverted diffusion flame, array of jets, flame blowout, combustion stability

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