Exergoeconomic Analysis of Air Cooled Turboprop Engine: Air Craft Application

Sahu, Mridu; Choudhary, Tushar; Y, Sanjay

doi:10.4271/2017-01-2044

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…As mentioned above, even though gas turbine engines are one of emission sources, these systems have become irreplaceable owing to playing key role so as to improve transportation technology and power production for seven decades. Moreover, gas turbine engines have been main pillar of aircraft systems due to their higher propulsive power and low maintenance cost compared with reciprocating engines 6 . Due to competition in aviation sector, engine and component manufacturers have tried to increase system efficiency, thereby it reflects as lowering of specific fuel consumption (SFC) by averagely 2.4% at each year 7 .…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, gas turbine engines have been main pillar of aircraft systems due to their higher propulsive power and low maintenance cost compared with reciprocating engines. 6 Due to competition in aviation sector, engine and component manufacturers have tried to increase system efficiency, thereby it reflects as lowering of specific fuel consumption (SFC) by averagely 2.4% at each year. 7 According to researchers, the balance between the demand in air transportation and the attempts for reducing emission could not be possible, thereby it is expected to growth of aviation emission unless radical solution for aviation field.…”

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confidence: 99%

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Modeling of performance and thermodynamic metrics of a conceptual turboprop engine by comparing different machine learning approaches

Dursun

Toraman

Aygün

2022

Intl J of Energy Research

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In this study, several performance and thermodynamics metrics of a conceptual turboprop engine (C-TPE) were computed at 50 (fifty) power settings. Based on these computations, these parameters were predicted by employing artificial neural networks (ANN) and long-short term memory (LSTM) approaches. The obtained parametrically data were subjected to preprocessing for normalization. After determining model inputs to estimate the engine outputs, these data were introduced to ANN and LSTM. Then, the findings by two methods were compared with each other. In this context, fuel flow, air mass flow, exhaust velocity, compressor pressure ratio, turbine outlet temperature, and revolutions per minute (RPM) were selected as model inputs to estimate several metrics such as net thrust, specific fuel consumption (SFC), overall efficiency, exergy efficiency, and environmental effect factor (EEF) regarding the C-TPE. For modeling of the mentioned metrics, 80% and 20% of the data were used for training and testing, respectively. According to the findings of energetic and exergetic computations, SFC value of the C-TPE increases from 16.205 to 17.737 g/ kNs whereas its overall efficiency varies from 23.63% to 22.31% owing to decrement in RPM. Moreover, exergy efficiency of C-TPE remains between 23.93% and 26.2% whilst its EFF value resides between 2.66 and 3.05 throughout power settings. Finally, the modeling results indicate that coefficient of determination (R 2 ) regarding overall efficiency of C-TPE was found as 0.951867 with respect to the ANN model whereas it was calculated as 0.999906 with the proposed LSTM. It could be deduced that since LSTM is capable of providing lower the model error than the ANN for the same set of data, this method could be implemented to predict thermodynamics metrics of different kinds of gas turbine engine where obtaining data is limited.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Modeling of performance and thermodynamic metrics of a conceptual turboprop engine by comparing different machine learning approaches

Dursun

Toraman

Aygün

2022

Intl J of Energy Research

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“…In this sector, major priorities are not only to operate with the maximum cost effectiveness, but also to reduce fuel consumption and emissions of greenhouse gases and pollutants. Several studies have been conducted in which energy, exergy, and exergoeconomic analyses were applied to aviation propulsion systems as important tools for understanding and optimizing their operation to identify operational, economic, and environmental improvement opportunities [1,[3][4][5][6][7][8]. In these studies, the most frequently used method was specific exergy costing, which is based on algebraic cost balance equations obtained from conventional economic analyses and complemented with auxiliary equations [9].…”

Section: Introductionmentioning

confidence: 99%

Residue Cost Formation of a High Bypass Turbofan Engine

et al. 2020

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The kinetic energy produced by a turbofan engine is inseparable from the unavoidable generation of waste heat dissipated into the environment and the chemical exergy of exhaust gases. However, exergoeconomic cost analyses of these propulsion systems have focused only on the formation process of the functional product and not the cost of residue formation. In this study, symbolic thermoeconomics was applied to evaluate the impact of residue formation on the production costs of a turbofan engine and analyze the effect of component malfunctions on the fuel impact formula for diagnosing anomalies. The GE90-115B high bypass turbofan engine under takeoff conditions and a thrust requirement of 510 kN was considered as a case study. The total exergoeconomic cost of the engine was 26,754.28 USD/h: 61.04% corresponded to external resources; 0.14% and 33.07% corresponded to waste heat dissipated from the bypass and core engine, respectively; 3.28% corresponded to the chemical exergy of the exhaust gases; 2.47% corresponded to capital and operating costs. A malfunction analysis revealed that a 1% reduction in the isentropic efficiency of the compressor reduced the total kinetic exergy by −0.77 MW, increased fuel consumption by 0.49 MW, and generated irreversibility and residue of 0.80 and 0.45 MW, respectively.

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