The methodology of the gas turbine efficiency calculation

Kotowicz, J.; Job, Marcin; Brzęczek, Mateusz; Nawrat, Krzysztof; Mędrych, Janusz

doi:10.1515/aoter-2016-0025

Cited by 18 publications

(21 citation statements)

References 7 publications

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“…For a simulated TIT of 1400 • C, which is a value consistent with state-of-the-art GT technology, the resulting simple-cycle energetic efficiency for usual pressure ratios lies in the range of 38-41%. For higher temperature levels with significant blade cooling, the theoretical TIT calculated with ISO 2314 is 150-200 • C lower than the COT, see Reference [53].…”

Section: Validationmentioning

confidence: 99%

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

et al. 2018

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State-of-the-art thermodynamic simulation of energy conversion processes requires proprietary software. This article is an attempt to refute this statement. Based on object-oriented programming a simulation and exergy analysis of a combined cycle gas turbine is carried out in a free and open-source framework. Relevant basics of a thermodynamic analysis with exergy-based methods and necessary fluid property models are explained. Thermodynamic models describe the component groups of a combined heat and power system. The procedure to transform a physical model into a Python-based simulation program is shown. The article contains a solving algorithm for a precise gas turbine model with sophisticated equations of state. As an example, a system analysis of a combined cycle gas turbine with district heating is presented. Herein, the gas turbine model is validated based on literature data. The exergy analysis identifies the thermodynamic inefficiencies. The results are graphically presented in a Grassmann chart. With a sensitivity analysis a thermodynamic optimization of the district heating system is discussed. Using the exergy destruction rate in heating condensers or the overall efficiency as the objective function yields to different results.

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Section: Validationmentioning

confidence: 99%

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

et al. 2018

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“…The pressure drop in combustion chamber is an uncertainty which should be estimated, calculated or measured for the possibility of delineation the parameters of gas turbine cycle characteristic points [10][11][12]. The cross section through combustion chamber should be as big as possible, so there are a few kind of combustor design, annular, tubo-annular, silo and tubular.…”

Section: Assessment Of Gas Turbine Performance Decreasing Due To Combustion Chamber Lossmentioning

confidence: 99%

Impact of pressure drop in combustion chamber on gas turbine performance

Herdzik

2020

tren

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Paper discusses the problem of pressure drop in the process of working medium flow through combustion chamber of gas turbine. The pressure loss is an internal disadvantage of combustion chamber depends on many parameters, especially the chamber design and working gas flowrate. There is a problem to calculate the parameters of working medium in characteristic points of gas turbine thermodynamic cycle because the total pressure before and after combustion chamber is not known. There is a lack of information from manufacturer about it and in publications as well (mainly no experimental data, only theoretical considerations). It will be important information because the pressure drop has an meaningful influence on gas turbine performance. The paper presents an estimation of decreasing the performance of gas turbine from discussed reason. Author of that manuscript recognized the necessity of showing the importance of that parameter and turning the attention to not fully recognized problem.

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“…The calculation results are not verified. In [7], a method for calculating the efficiency of a GTE with high cycle parameters is presented, but the working fluid was assumed to be an ideal gas. In [8], the correlation of R with combustor parameters was performed.…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned above, this approach leads to a decrease in calculation accuracy. The simplifications made in [4][5][6][7][8][9][10][11][12][13][14][15][16] are valid for an ideal gas; however, modern air-breathing engines are characterized by high pressure ratio and temperatures [17], which leads to the dissociation of molecules. Dissociation changes the ratio between enthalpy and temperature, therefore, disregarding dissociation leads to estimation errors of the gas enthalpy [18].…”

Section: Introductionmentioning

confidence: 99%

Development of a method to improve the calculation accuracy of specific fuel consumption for performance modeling of air-breathing engines

Kislov

Ambrozhevich

Shevchenko

2021

EEJET

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Determination of specific fuel consumption of air-breathing engines is one of the problems of modeling their performance. As a rule, the estimation error of the specific fuel consumption while calculating air-breathing engine performance is greater than that of thrust. In this work, this is substantiated by the estimation error of the fuel-air ratio, which weakly affects thrust but significantly affects the specific fuel consumption. The presence of a significant error in the fuel-air ratio is explained by the use of simplified methods, which use the dependence of enthalpy as a function of mixture temperature and composition without taking into account the effect of pressure. The developed method to improve the calculation accuracy of specific fuel consumption of air-breathing engines is based on the correction of the fuel-air ratio in the combustor, determined by the existing mathematical models. The correction of the fuel-air ratio is made using the dependences of enthalpy on mixture temperature, pressure and composition. The enthalpy of the mixture is calculated through the average isobaric heat capacity obtained by integrating the isobaric heat capacity, depending on mixture temperature, pressure and composition. The calculation accuracy of the fuel-air ratio was verified by comparing it with the known experimental data on the combustion chamber of the General Electric CF6-80A engine (USA). The average calculation error of the fuel-air ratio does not exceed 3 %. The developed method was applied for correcting the specific fuel consumption for calculating the altitude-airspeed performance of the D436-148B turbofan engine (Ukraine), which made it possible to reduce the estimation error of the fuel-air ratio and specific fuel consumption to an average of 3 %

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The methodology of the gas turbine efficiency calculation

Cited by 18 publications

References 7 publications

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

Simulation and Exergy Analysis of Energy Conversion Processes Using a Free and Open-Source Framework—Python-Based Object-Oriented Programming for Gas- and Steam Turbine Cycles

Impact of pressure drop in combustion chamber on gas turbine performance

Development of a method to improve the calculation accuracy of specific fuel consumption for performance modeling of air-breathing engines

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