Numerical modeling of two-phase flows in structurally complex air cleaning devices

   The article addresses the challenges of improving methods for studying large-scale multi-component cleaning devices. The considered method can be used for the numerical investigation of two-phase flows in structurally complex devices such as air cleaning systems used in gas transportation, energy, and industrial sectors, with the aim of designing and/or enhancing devices to improve the reliability of compressor and gas turbine units (GTUs). In particular, GTUs are widely employed as drives at compressor stations within gas transportation systems. The potential for reducing their material intensity through the use of modules with cyclone-filter elements featuring combined stages of coarse and fine cleaning is examined. Numerical studies of two-phase flow motion within a module were conducted using computational fluid dynamics (CFD) methods. The module geometry, resembling the arrangement of cleaning elements in battery cyclones, was chosen as the initial model. Based on the aerodynamic flow study results within the module, the coordinates for the element arrangement were determined to facilitate maximum entry of the two-phase flow into the elements. Consequently, a scheme for the localization of semi-volute inlets into the elements was developed. The aerodynamic characteristics of the dispersed flow obtained through numerical studies were validated using a full-scale model of the "cyclone-filter" element with a housing diameter of 100 mm. As a result of both numerical and full-scale investigations, a concept for an air cleaning device was developed suitable for both large and small enterprises, as well as for scenarios involving extreme air conditions in populated areas due to natural or anthropogenic incidents. A method for a combined numerical study of structurally complex devices was established to optimize the arrangement of their elements with a computational resource expenditure acceptable for small computing centers.

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