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International Conference on Computer Simulation in Physics and Beyond IOP Publishing IOP Conf. Series: Journal of Physics: Conf. Series 1163 (2019) 012022 doi:10.1088/1742-6596/1163/1/012022 Development of radial turbines in low-power Gas-turbine engines A S Pugachuk1,2, V G Pribylov1,3, J A Gavrilova2 and V N Konoplev3 1 Joint Institute for High Temperatures, Russian Academy of Sciences, 13 Bd.2, Izhorskaya st., 125412, Moscow, Russia 2 Bauman Moscow State Technical University, 5 2-ya Baumanskaya st., 105005, Moscow, Russia 3 RUDN University, 6 Miklukho-Maklaya st., 117198, Moscow, Russia E-mail: pugachukalexandr@mail.ru Abstract. The article deals with the problem of providing required gasdynamic and strength parameters of turbines in low-power Gas-turbine engines. A method of turbine geometrical characteristics correction is offered. It includes blade profile evaluation and modification, turbine load complex modeling and CFD-modeling of gasdynamic processes. This method is applied to the turbine impeller prototype. The most loaded places of the impeller are revealed. Hazardous locations are places of blades joints with the disk in circumference where safety factor is close to the minimum acceptable value. One of the most effective methods of strength enhancement is use of parabolic joints between the wheel and blades. These joints not only can increment safety factor up to 1.3 but also preserves the gasdynamic efficiency of the turbine. This presented method which is based on CFD-modeling and strength analysis, allows to minimize fabrication time and costs of new micro-turbines’ developing process. 1. Introduction Gas turbine engines are used widely in the electric power industry, heating supply systems and industrial facilities. The main component of such unit is a turbine: steam, gas or water powered [1]. One-stage centripetal axial-radial gas turbines are used in low power gas turbine engines (micro- turbines) because of their small dimensions (in comparison with axial turbines) and relatively high efficiency at the low gas flow rate [2]. A high-speed radial gas turbine engine, assembled on a single shaft with a high-frequency generator, composes the main part of a micro-turbine. In the market, fewer low power gas turbine engines are offered compared to high power engines [3]. Cost-effectiveness, reliability of development and enhancement of modern stationary gas-turbine engine construction depend on the capability of gas turbine engine flow range and flow process perfection. Micro-turbine designers achieve the task of using in designed micro-machines geometrical characteristics of existing prototype impellers with proven characteristics (e.g., aircraft impellers). It is necessary to demand higher standards of impeller durability while preserving required gasdynamic parameters of flow range, in order to provide the required frequency speed of micro-turbines. Thus, one of the most important tasks of micro-turbine design is radial turbine impeller gasdynamic and durability [4] optimization. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Published under licence by IOP Publishing Ltd 1PDF Image | Development of radial turbines in low power Gas turbine engines
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