Abstract
The work deals with the experimental study of the aerodynamic structure of a swirling flow in the isothermal model of two-stage vortex combustion chamber. The main attention is focused on the process of flow mixing of two successively connected tangential swirlers of the first and second stages of the working section. Data on flow visualization are presented for two patterns of flow swirling. Time-averaged profiles of the axial and tangential velocity components are obtained with the help of laser-Doppler anemometer. In the case of flow co-swirling between two stages of the working section, instability of a secondary flow in the form of precessing vortex was distinguished. For the regime with counter flow swirling, effective mixing of the swirl flows was found; this was reflected by formation of the flow with uniform distribution of axial velocity over the cross-section.
Highlights
Investigation of the vortex flows is a significant part of the modern fluid dynamics
Small air bubbles were used as the flow markers. These bubbles were illuminated by a light source, to obtain the general flow pattern, or by a narrow light “sheet” formed via sweeping a laser beam on a cylindrical lens, to visualize the flow structure in a certain cross-section of the working section
According to analysis of visualizations, the regime characterized by the aerodynamic flow structure, optimal from the point of efficient flow mixing at the first and second stages, was determined
Summary
Investigation of the vortex flows is a significant part of the modern fluid dynamics. The devices, based on working medium swirling, are used in hydropower engineering, thermal power engineering, petroleum and chemical industries and many other fields [1]. To optimize the process of flow mixing in these devices, it is necessary to understand the flow structure and mixing mechanisms. These studies are relevant for modernization and improvement of the vortex combustion chamber [4]. This relates to the problems of the most efficient combustion of fuel, reducing pollutant emissions and increasing the operational lifetime of power plants [5-8]
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