Yurko I. Improving the efficiency of the centrifugal compressor by optimizing the variable inlet guide vanes

Research object: gasdynamic processes in inlet guide vanes and threedimensional impeller of centrifugal compressor. The purpose of research is development of theoretical foundations and practical realization of optimal design of variable inlet guide vanes taking into account the variable modes of operation of centrifugal compressors. Research methods: analytical profiling methods, methods of computational fluid dynamics, block-hierarchical approach to the design process, the theory of design of experiment (DOE) and search-optimization techniques. Theoretical and practical results: the practical significance of the results for the compressor industry is to use the method developed part-to-part optimization for the design of modern inlet guide vanes that will improve the energy performance of centrifugal compressors in view of their possible modes of operation. Computer parametric model of inlet guide vane and threedimensional centrifugal impeller, together with the numerical simulation of the procedure may be used for studying dynamic processes in these constructions taking into account additional factors. Novelty: for the first time in the selection of geometric parameters of IGV in the developed technique part-to-part optimization takes into account the possible modes of operation of the centrifugal compressor; for the first time in compressor developed approach to system optimization IGV that combines block-hierarchical representation of the design process, the theory of experiment planning and calculations in CFD-software, which will significantly reduce design time and ensure accuracy of calculation; first proposed analytical profiling the shape of IGV using Bezier curves, which provides high flexibility and minimal shaping parameters necessary for the design of the system; the first time for the various laws swirl flow at the entrance set the limits of the actual spatial regulation transonic centrifugal compressor impeller; based on numerous experiments, new data on the effect of the angle of the blade installation lattice consisting of symmetric profiles at its optimum geometric parameters. Extent of introduction: Department of Technical Thermophysics Sumy State Ubiversity, "TRIZ" Ltd., Sumy. Areas of use: compressor construction areas.