Influence of the Droplet Spray Torch Initial Configuration Behind the Aerodynamic Spraying System on Fuel Distribution Uniformity in the Direct-Flow Combustion Chamber

Abstract

The paper examines influence of the initial fuel droplet spray torch configuration generated by the aerodynamic spraying system on uniformity of the fuel distribution in the direct-flow combustion chamber. The aerodynamic spraying system consists of several fuel-delivery sprayers, which operating principle is similar to a carburetor. Fuel in this spraying system is injected into the air flow passing through the sprayer internal channel. The air-droplet mixture droplet spray torch configuration is determined by the number and position of the outlet openings. The paper presents results of a numerical simulation of the two-phase (air-droplet) flow using the specialized "HyperCube" software package. The fuel droplet combustion process is not simulated in this problem statement; the droplets are assumed to be inert. The variable parameters chosen include spray configuration determined by the fuel mass flow rate distribution profile across the nozzle height, and the monodisperse droplets size. Flow velocity distribution fields, droplet motion trajectories, and three-dimensional distribution diagrams of the droplet mass flow rate intensity in various cross-sections of the model combustion chamber are obtained. In addition to a qualitative analysis of the droplet trajectory distribution within the combustion chamber volume, the paper proposes a method for quantitatively assessing uniformity of the droplet mass flow distribution in the given combustion chamber cross-sections. In the latter case, standard deviation of the mass flow rate intensity from its cross-sectional average value is chosen as the criterion. The paper determines a droplet spray torch configuration that ensures best uniformity of the fuel droplet distribution in the combustion chamber

Please cite this article in English as:

Voronetskiy A.V., Batenin I.A. Influence of the droplet spray torch initial configuration behind the aerodynamic spraying system on fuel distribution uniformity in the direct-flow combustion chamber. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2025, no. 4 (155), pp. 23--42 (in Russ.). EDN: KMCMPI

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