Exergetic sustainability off-design analysis of variable-cycle aero-engine in various bypass modes

Aygün, Hakan; Turan, Önder

doi:10.1016/j.energy.2020.117008

Cited by 61 publications

(22 citation statements)

References 14 publications

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“…Thus, the irreversibility occurred in component can be quantified. Expression of exergy destruction is shown as: 27,28 Ex dest ¼…”

Section: Methodology: Main Principles Of Thermodynamic Analysismentioning

confidence: 99%

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Investigation of exergetic and exergo‐sustainability metrics for high by‐pass turbofan engine at different power settings

Aygün

2021

Env Prog and Sustain Energy

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This paper investigates influences of several throttle settings on several exergetic and exergo-sustainability parameters by employing thermodynamic principles for high by-pass turbofan engine as named PW4000 engine. First, energy efficiency of the PW4000 is found to vary between 9.77% and 37.69% due to rising from 5544 RPM to 9169 RPM. Considering exergetic results on component basis, rising power setting leads to increase exergy efficiency of the components. Also, the combustor of PW4000 belongs to lowest exergy efficiency throughout 19 RPMs. Namely, exergy efficiency of the combustor increases from 69.14% to 86.31% whereas that of LPT raises from 92.01% to 93.25% owing to the increase in RPM. Considering sustainability parameters for whole engine, exergy efficiency of PW4000 varies from 9.13% to 35.26% whereas its exergetic sustainability index increases from 0.276 to 1.238 throughout RPM values. Furthermore, environmental effect factor of PW4000 decreases from 3.26 to 0.807 due to rising RPM value. According to these results, it is revealed that there are generally nonlinear relationship between thermodynamic parameters and power settings. To measure exergetic metrics of turbofan engines for different running points can allow researchers to find optimum RPM value of the engine in terms of thermodynamic sustainability.

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“…Thus, the irreversibility occurred in component can be quantified. Expression of exergy destruction is shown as: 27,28 Ex dest ¼…”

Section: Methodology: Main Principles Of Thermodynamic Analysismentioning

confidence: 99%

“…If variation of specific heat value with temperature is kept constant, the specific physical exergy could be arranged as: 27,28 ε…”

Section: Methodology: Main Principles Of Thermodynamic Analysismentioning

confidence: 99%

Investigation of exergetic and exergo‐sustainability metrics for high by‐pass turbofan engine at different power settings

Aygün

2021

Env Prog and Sustain Energy

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“…The exergy balance equations (Equations 15–31) of the whole engine and its components are listed in Table 1. According to the ideal gas expression, the physical exergy for air and combustion gaseous with constant specific heat capacity can be written as 27‐32,37‐40 :

\overset{Ex}{true} = \overset{m}{true} ([], c_{p ((), T)} T_{0} ([], \frac{T}{{normalT}_{0}} - 1 - italicln \frac{T}{T_{0}}) + R_{g} T_{0} italicln ((), \frac{P}{P_{0}}))

…”

Section: Materials and Methodologymentioning

confidence: 99%

TF33 Turbofan engine in every respect: Performance, environmental, and sustainability assessment

Ballı¹,

Ekici

Karakoç

2020

Env Prog and Sustain Energy

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The performance parameters, environmental sensitivity, and sustainability of a turbofan engine used extensively in military aviation are examined to the last detail. Assessment parameters named as energy efficiency, specific fuel consumption (SFC) and thrust, fuel heating value ratio (FHVR), thermal limit ratio (TLR), enthalpy ratio (ER), engine thrust ratio (ETR), fuel cost rate (FCR), specific fuel cost rate (SFCR), exergy efficiency, exergy destruction ratio, exergy loss ratio (ExLR), waste exergy ratio (WExR), exergetic improvement potential (ExIP), relative exergetic improvement potential (RExIP), productivity lack ratio (PLR), fuel exergy waste ratio (FExWR), environmental effect factor (EEF), ecological effect factor (EcoEF), sustainable efficiency factor (SEF), and exergetic sustainability index (ESI) were used to analyze thermodynamically the engine. The most sustainable and environmentally friendly components are researched and the results are presented to the literature. Between the components, the combustion chamber (CC) has the highest EEF with 0.8627 and the highest EcoEF value with 1.8627. Comparing the engine components, the low‐pressure turbine (LPT) has the best SEF value with 67.83 and the best ESI value with 66.83. Conversely, the CC has the worst SEF value with 2.16 and the best ESI value with 1.16. Ultimately, environmental and sustainability results from the analysis are expected to help understand the link between turbofan engine selection for both commercial and military aircraft and green flight paths, and therefore, make the choice of turbofan engines environmentally benign and greener.

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“…Energy, exergy and exergoeconomic analyses with sustainability and environmental analyses have been a hot topic in aviation for different aircraft engines (Balli and Hepbasli, 2014;Aydin et al 2015;Turan and Aydin, 2016;Şöhret et al 2016;Ekici et al 2018;Baklacioglu et al 2018;Söğüt, 2018;Sahu et al 2018;Aygun and Turan, 2020;Yuksel et al 2020). The analyses results of these studies are utilizable as a guide for the design and improvement efforts of the aircraft engines.…”

Section: Literature Survey On Exergy Based Sustainability Assessment Of Energy Systemsmentioning

confidence: 99%

Exergy Based Sustainability Assessment of an Orc Integrated Waste Heat Recovery System for Marine Vessels

Konur¹,

Saatçıoğlu²,

Çolpan

2021

Dokuz Eylül Üniversitesi Denizcilik Fakültesi Dergisi

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This paper introduces the basics of exergy-based sustainability assessment and the framework that should be shaped within the first stage. The sustainability assessment framework leads to sustainability indicators that are used to assist policymakers and decision-making processes. The literature review shows that the energy systems are suited to sustainability assessment with exergy based assessment tools and indicators from an environmental point of view. In this study, an exergy based sustainability assessment is carried out by using the exergy analyses results of an ORC (organic Rankine cycle) integrated waste heat recovery system on a 1,221 TEU container ship. The exergy analysis results are used to derive comparable and quantified exergetic sustainability indicators that indicate the sustainability level and further improvement potentials with the utilization of the proposed waste heat recovery system design. The assessment results show that the minimum waste exergy ratio is obtained with the value of 0.106 when R1234ze(Z) is used and the evaporating pressure is 3 MPa. R1234ze(Z) and R245fa working fluids show good environmental performance for the proposed system design. The maximum exergetic sustainability index value is obtained with the value of 8.435 when R1234ze(Z) is used and the evaporating pressure is 3 MPa.

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Exergetic sustainability off-design analysis of variable-cycle aero-engine in various bypass modes

Cited by 61 publications

References 14 publications

Investigation of exergetic and exergo‐sustainability metrics for high by‐pass turbofan engine at different power settings

Investigation of exergetic and exergo‐sustainability metrics for high by‐pass turbofan engine at different power settings

TF33 Turbofan engine in every respect: Performance, environmental, and sustainability assessment

Exergy Based Sustainability Assessment of an Orc Integrated Waste Heat Recovery System for Marine Vessels

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