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Ciocan I.,Polytechnic University of Bucharest | Datcu D.,Development Institute for Gas Turbines | Toma A.,Development Institute for Gas Turbines | Tonoiu S.,Polytechnic University of Bucharest
UPB Scientific Bulletin, Series D: Mechanical Engineering | Year: 2016

Impellers prototypes machining subject is developed in this paper, with accent for turning. These are complex parts and, in this work, the necessity to design a special model for turning operation, starting from final part model, is demonstrated. A short presentation of main impeller surfaces was considered, in accordance with technological necessities. For efficient machining, originally model of part impeller must to be technologically re-engineered, with specific useful areas for turning, milling and measurement. The paper presents three technological solutions of these issues, and defines the estimation formulae for its parameters. Three steps turning process was proposed, by considering these technological improvements, highlighting the sensitive points for correct machining. Finally, a model for impellers fixture, when machining, is proposed. This is designed to be utilised in all processing: turning, milling, measurement, in a single clamping, and is conceived for multiple dimensions for presented rotor's geometry.

Ene B.,Development Institute for Gas Turbines | Silviu I.,Development Institute for Gas Turbines | Valeriu V.,Development Institute for Gas Turbines | Constantin V.,Development Institute for Gas Turbines | And 6 more authors.
WSEAS Transactions on Environment and Development | Year: 2010

The afterburning installation allows the increase in the cogenerative group's flexibility according to the requirements of the technologic process and increases the steam quantity delivered by the heat recovery steam generator. The requirements concerning the development of high performance equipments with low environment impact and high flexibility have increased lately. Therefore a complex analysis is needed for obtaining the necessary data for designing the afterburning installation. The paper presents the researches carried out at Suplacu de Barcau gas turbine cogenerative power plant on the afterburning installation as well as the phase of bench experimentations for an intimate research of the processes and for the elimination of disturbing factors in the plant. The researches at the cogenerative plant were carried out in different operating conditions, in terms of stack emissions, noise, external superficial temperature profile and electric energy quality.

Popescu J.,Development Institute for Gas Turbines | Vilag V.,Development Institute for Gas Turbines
Metalurgia International | Year: 2010

The priority of the environmental politics and the responsibility to control and reduce the environmental degradation led to a technological evolution in the direction of avoiding or minimizing the pollution without modifying the industrial processes, while an international crisis linked to oil price increase determined the pursuit of renewable energy sources, independent from fossil ones. In the context of using alternative fuels for gas turbines, the paper studies, based on numerical experiments, the constructive solution for transforming an aviation gas turbine into an aero-derivative one, working on gaseous fuel. The first part is dedicated to a comparative examination of several representative fuels, analyzed from the point of view of their combustion performances in an aviation gas turbine. The characteristics of using various gaseous fuels are presented comparatively, each variant being described with advantages and disadvantages. The burning process in the modified combustion chamber is simulated using a commercial CFD code. The main goal of the CFD applications is to define, for steady states, the optimum fuel injector geometrical configuration in order to transform the combustor chamber for gas fuel such as the new gas turbine works in safety conditions - a stabilized process and the expected flow and wall temperatures. The geometry is optimized to obtain a stabile flame that doesn't burn the combustion chamber walls and the first stator stage of the turbine. The conclusions are related to previous successful experiments on the test bench, realized following the natural gas combustion numerical simulations.

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