Increasing the Stability of Combustion Processes in the Combustion Chamber of Gas-Turbine Engine Through the Improvement of the Airgas Channel (original) (raw)
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Increasing the Stability of a Low-Emission Gas Turbine Combustion Chamber
Collection of Scientific Publications NUS, 2021
Purpose. The main aim of the research is to increase the stability of gaseous fuel combustion processes in a gas turbine engine (GTE) low-emission combustors due to the plasma-chemical influence on the processes of mixture formation and gas-dynamic improvement of the flow part. Method. The improvement of vibrating characteristics of GTE low-emission combustors with plasma-chemical stabilizer is provided by solution the main research problems in accordance with the generally accepted methodology of scientific research. The theoretical basis of the research is the scientific work of specialists in the study of hydrocarbon fuels combustion. Results. Increasing the stability of a low-emission GTE combustion chamber operating on gaseous fuel is ensured by the influence of low-temperature plasma generators on the fuel-air mixture formation processes. The mathematical model of unsteady processes in a GTE low-emission combustion chamber, that takes into consideration of the plasma chemical generator influence on the stability processes and allows to predict the pulsation characteristics of fuel-burning devices, is developed. Scientific novelty. The performed numerical experiment have shown that the aerodynamic improvement of the flow part and the use of the plasma generator reduces the pressure pulsations inside flame tube by 10…35%, while in the area of primary air supply the reduction of pulsations is most pronounced. Practical importance. Creation of a numerical experiment technique to increase the stability of gaseous fuel combustion processes in low-emission combustion chambers using modern computational hydrodynamics complexes will increase the efficiency of design and research work. Practical recommendations have been developed to improve the acoustic stability of processes in a low-emission combustion chamber with preliminary mixing of fuel with air for a 25 MW gas turbine engine using low-current plasma-chemical generators and air-dynamic improvement of the combustion device. The results and calculating methods the characteristics of the combustion chamber with plasma chemical stabilizer are used at gas turbine enterprises in the designing new and upgrading existing models of GTE low-emission combustion chambers.
Збірник наукових праць Національного університету кораблебудування, 2023
The need to reduce the impact of energetics on the environment determines the need to develop and adapt energy-efficient decarbonized systems, as well as determine the ranges of their rational parameters. The aim of the work is to study the energy and emission characteristics of gaseous ammonia burning in the combustion chamber of a gas turbine engine with over-expansion. The combustion chamber for the afterburning of waste gases of a hightemperature fuel cell as part of a gas turbine unit with over-expansion was chosen as the object of the investigation. For detailed forecasting of the characteristics of the combustion chamber operating on ammonia, an approach was used, according to which the burning device is considered as a set of different chemical reactors (perfectly stirred, plug-flow), simulating the main processes of chemical transformations in different sections of the flame tube of the combustion chamber. A reactor model of the combustion chamber operating on gaseous ammonia has been developed, in which the relevant reactors simulate the primary zone of the combustion chamber, the dilution zone and the processes of mixing of secondary air, which is supplied to the respective zones, with the main flow. The mathematical model is based on the equations of conservation of mass and energy for a chemically reacting system. As a kinetic scheme of gaseous fuel burning in the combustion chambers of gas turbine engines, the mechanism of high-temperature oxidation of ammonia is used, taking into consideration the chemical reactions of hydrogen combustion, which includes 71 reactions with 22 components. The influence of operational parameters of the combustion chamber on the distribution of temperature and concentrations of chemically reactive components in the volume of the burning device is considered. Calculations of the working process of the combustion chamber were carried out for a thermal power of 1.,0 MW, a pressure of 0.3 MPa and at variation of the excess air coefficient from 1.41 to 2.03. The possibility of stable operation of the combustion chamber on ammonia under the conditions of effective swirling of the primary air is shown. At the same time, the residence time of the reagents in the primary combustion zone should exceed 0.025 seconds, which is possible if there are powerful devices for stabilizing combustion. The results of the work can be used in the development of combustion chambers of gas turbine engines for decarbonized energy systems, as well as for afterburning products of solid oxide fuel cells operating as part of hybrid power plants.
Збірник наукових праць Національного університету кораблебудування, 2022
The need to reduce the impact of energy on the environment requires the development of decarbonized systems that do not use carbon, as well as the determination of optimal parameters for their operation. The purpose of the work is to establish the features of the organization of the working process of the combustion chamber of a gas turbine engine that operates on gaseous ammonia. The thermodynamic and gas dynamic processes in a hybrid gas turbine combustion chamber with partial mixing of components outside the combustion zone were chosen as the object of study. To predict the aerodynamic structure of chemically reacting flows in the ammonia-burning combustion chamber, a three-dimensional modeling method was used. The proposed mathematical model is based on the equations of continuity, conservation of momentum, conservation of energy, transport of chemical components of the mixture, as well as equations that describe the characteristics of the turbulence of swirled flows. The Eddy-Dissipation-Concept (EDC) combustion model was used to calculate the oxidation processes of ammonia in the gas turbine engine combustion chamber, which takes into consideration the interaction of kinetics and turbulence. To calculate the kinetic aspects of high-temperature ammonia combustion in air, a chemical scheme with 71 reactions and 22 components is proposed, which can be used over a wide range of temperatures, pressures, and excess air coefficients. A designed scheme of a combustion chamber operating on gaseous ammonia is proposed. The features of the organization of the working process in the combustion chamber with partial mixing of components outside the combustion zone at a thermal power of 1.0 MW are considered. Three-dimensional CFD calculations of energy and emission characteristics of the ammonia-burning combustion chamber are carried out. The possibility of complete ammonia combustion in the volume of the fuel-burning device with effective swirling of primary air is demonstrated. The results obtained can be used in the development of combustion chambers of gas turbine engines for decarbonized energy systems, including fuel cells.
NTU "KhPI" Bulletin: Power and heat engineering processes and equipment, 2015
УДК 621.43.056 С. И. СЕРБИН, д-р техн. наук, проф.; директор Машиностроительного института НУК им. адм. Макарова, Николаев; Н. А. ГОНЧАРОВА, ассистент кафедры турбин НУК им. адм. Макарова, Николаев; В. В. ВИЛКУЛ, нач. сектора расчетных и экспериментальных работ отдела камер сгорания ГП НПКГ «Зоря»-«Машпроект», Николаев ИССЛЕДОВАНИЕ ОСОБЕННОСТЕЙ РАБОЧЕГО ПРОЦЕССА КАМЕРЫ СГОРАНИЯ ГТД МОЩНОСТЬЮ 2,5 МВТ, РАБОТАЮЩЕЙ НА СИНТЕЗ-ГАЗЕ Статья посвящена вопросам численного моделирования рабочих процессов камер сгорания газотурбинных двигателей, работающих на синтез-газе. Авторами исследованы вопросы возможности применения синтез-газов в качестве основного топлива для камер сгорания. Рассмотрены вопросы применения конструктивных модификаций топливосжигающих устройств с целью применения RQLтехнологии для улучшения экологических характеристик существующих камер сгорания газотурбинных двигателей. Ключевые слова: камера сгорания, синтез-газ, RQL-технология, математическое моделирование, горение.
Working Process of Internal Combustion Engine Running on Enriched Hydrogen Gasoline-Air Mixture
Proceedings of the National Academy of Sciences of Belarus, Physical-Technical Series, 2018
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