Tran C. Development of the methods for the analysis of gas turbine rotors cooling

The object of study: flow and heat transfer in high-temperature gas turbines. Objective: development of the methods of cooling analysis of gas turbines rotors and the further development of such cooling systems; improvement the network method of analysis of gas turbines cooling systems, taking into account cooling channels choking at critical and supercritical pressure drops; improvement of the method for the centrifugal pressure prediction in the rotors cavities of gas turbines with taking into account cavities geometry, air or gas flow direction, and the angle rotor velocity; development of the method for analysis of cooling of the gas turbine rotors, basing on the matching network method and CFD method; analysis of the cooling system of high-temperature gas turbine rotor with created methods. Research methods and equipment: theoretical thesis was based on the fundamentals of the theory of heat transfer, fluid dynamics, and numerical methods of analysis of branched hydraulic networks. In particular, for the calculation of hydraulic networks cooling systems was used a method based on graph theory, for solving ordinary differential equations for the swirl flow in the cavities of the turbine rotor - Runge-Kutta method. Theoretical and practical results: programs and recommendations for the development of the effective cooling system of the modern and advanced gas turbines rotors. Novelty: the method for the centrifugal pressure predicting in various cavities of the rotor gas turbines, which takes into account the influence of the rotor geometry, flow direction, angular velocity; the method of calculation branched hydraulic networks, which eliminates the oscillation of the iterative process and provides rapid convergence of the calculations of the gas turbine rotor cooling; method of the analysis of the cooling systems of gas turbines on the basis of the hydraulic networks method and the CFD method that allows to predict cooling for any form rotors; the method of branched hydraulic networks analysis, which allows critical and supercritical pressure drops in the cooling channels. Degree of implementation: program and recommendation are used in the company Turboatom VAT (Kharkiv) for designing of the gas turbines cooling systems. Scope of application: gas turbine industry.