There are many large fans currently in use in different sectors of industry, and replacing them at the end of their service life is an important issue. Most existing fans are made of metals, but plans are in place to replace them with fans made of composites. The use of new materials and the design of fan blades with new shapes will make it possible to reduce the weight of the structure, thus also reducing energy costs and making the operation of cooling towers more effi cient. The development and introduction of new fan materials and designs can be aided by the use high-performance computer systems and advanced software programs.One possible means of saving energy in the metallurgical industry is reducing expenditures on the cooling of circulating water. Cooling towers are widely used as cooling equipment, there being about 3500 such towers in Russia. Researchers have attempted to signifi cantly (by more than double) reduce the amount of power consumed by the electric drives of the tower fans by optimizing the aerodynamic profi le of the fan blades and using contemporary materials. This article looks at some examples of numerically modeling the blades of fans for large-diameter cooling towers and presents results that have been obtained from the introduction of prototypes.In the design process, it is necessary to satisfy mutually exclusive requirements on productivity and energy use while also observing the given size limitations. In addition, the blade should be designed so as to be suitable for manufacture under factory conditions and the manufacturing costs should be correspondingly manageable. The blade must be stiff enough to maintain the prescribed aerodynamic shape during service, while the defl ection of the load-bearing stringer should be minimal in order to maintain the desired shape of the surface that faces the air fl ow.A physical model which satisfi es the following conditions was constructed In the process of searching for a fan-blade shape that will satisfy the above requirements: 1) only fl ow within the housing of the cooling tower is considered; 2) the fan is inscribed within the volume bounded by the tower's housing;3) the adhesion of particles to the wall is ignored; 4) the process is assumed to be adiabatic; 5) air is used as the working medium; 6) the rotation of the gage region is assigned; 7) the symmetry of the design makes it possible to study the stress-strain state of a single blade; 8) the design of the fan includes two elements: a steel platform and a glass-fi ber-reinforced-plastic blade rigidly attached to it; 9) gravitation, centrifugal forces, and the aerodynamic loads are taken into account;

No abstract

The article deals with the issues related to the mutual influence of vibrations and gas dynamic processes in the labyrinth seals (LS) of gas transmittal unit compressors. The mutual influence of vibrational gas dynamic processes in LS and vibrations of the rotor is studied. Within the framework of the unified algorithm, a solution is obtained for an unsteady aeroelastic one-dimensional gas flow problem in a deformable LS. A new factor (the rotor diameter in the LS region), which affects the pulsation magnitude of the gas dynamic force in the LS, is revealed. Changing the diameter of the rotor, you can reduce vibration. In this case, it is possible to reduce the designated clearances in the LS and to reduce the leakage.

No abstract

In this article we overview interdisciplinary problems and perform the numerical modeling of a two-way fluid-structure interaction (2FSI) of processes in a gas-rotor-stator system in relation to a prototype compressor stage. Physical, solid-state and mesh-based models are developed. By calculating the 2FSI, we evaluate the interference of a gas-dynamic stream and a deformable rotor blade. The obtained results are discussed. An important finding of the numerical experiment is that a phase-shift of oscillations between the static and dynamic pressure components in optically transparent environment and a phase shift of pressure oscillations in an optically transparent medium and movement in an optically opaque medium are discovered. О сдвиге фаз волн на границе двух сред Мехоношина Е.В., Модорский В.Я.