Перегляд за Автор "Burlaka, Maksym"
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ДокументIndustrial gas turbine engine off-design performance improvement controlling cooling air flow(NTU "KhPI", 2018) Moroz, Leonid; Burlaka, Maksym; Barannik, ValentynThe modern gas turbine engine has been used in current power generation industry for almost half a century. They are designed to operate with the best efficiency during normal operating conditions and at specific operating points. However, due to power grid demands, different ambient temperatures, fuel types, relative humidity and driven equipment speed the gas turbine units have to work today on partial load too, which can affect the hot gas path condition and life expectancy. At these off-design conditions, gas turbine’s efficiency and life deterioration rate might significantly deviate from the design specifications. In this paper, a digital twin concept for gas turbine unit off-design performance prediction (AxSTREAM® platform) is used. The description of created digital twin is presented. The validation of proposed gas turbine unit digital twin is carried out by comparison with literature source test data. The GTU performance estimation controlling cooling air at part load modes using digital twin was performed. ДокументNew method and algorithm of three-dimensional turbine guide blade rim optimization(ASME, 2010) Boiko, Anatoli; Govorushchenko, Yuri; Burlaka, MaksymThe new method and algorithm of three-dimensional turbine guide blade rim optimization were proposed using CFD-calculations, guide blade deformation and reasonable computation time consuming optimization approach. Verification of three-dimensional CFD-calculations results are presented by comparison with experimental data. The reasonableness of the isolated guide blade rim optimization of a turbine stage is justified. Two methods of the complex tangential lean implementation are compared. The parametric model is developed allowing conservation of the mass flow rate through the blade passage during optimization process. Both a bowing method and computational grids construction are realized in specialized program TOpGrid. The gained grids has been written in formatCGNS(CFDGeneral Notation System). The optimization approach is grounded on a combination of the DOE theory and Monte-Carlo method. The algorithm of optimization of guide blade rim is described. The examination of aerodynamic optimization efficiency with the developed algorithm of a guide blade rim at different a/l (a-throat of the channel, l-height of a blade) was carried out. The analysis of the results of the computation and physical explanation of reasons of a turbine blade passage efficiency rise is given.