P000 International Symposium on Sustainable Aviation (ISSA-2017), Kiev, Ukraine, 10 – 13 September, 2017 Table 1. The technical and calculated data of the engine AFTERBURNER EFFECT ON THE ENERGETIC AND EXERGETIC PERFORMANCE OF J79-GE-17 ENGINE WITH AFTERBURNER SYSTEM USED ON F-4 PHANTOM II AIRCRAFTS Fig.1. The sections of J79-GE-17 engine Ozgur BALLI İlker ADAK Sibel GUNES 1’st Air Supply and Maintenance Center, Eskisehir, Turkey. balli07balli@yahoo.com ilkeradak@hvkk.tsk.tr Mechanical Engineering, Erciyes University, Kayseri, Turkey. sgumus@erciyes.edu.tr Introduction The aviation industry has fostered strong economic growth through significant greenhouse gases emissions, which has triggered major political discussions, especially with regard to environmental issues (Kohler et al., 2014). On the other hand, the price of jet fuel will steadily increase because of higher energy demand and petroleum depletion (Gaspar and Sousa, 2016). Fuel efficiency of aircraft and helicopter engines becomes greater concern in recent years caused by rising fuel costs and as well as environmental impact of aviation emissions (Turan and Aydin, 2016).A reduction of energy use will also reduce gaseous emissions and related to the conservation of the environment (Boyaghchi and Molaie, 2015). Dincer and Rosen (2013) stated the relationships between energy and exergy, exergy and the environment, energy and sustainable development, and energy policy making and exergy in detail. The thermodynamic performance of aircraft engines can be determined by the energy analysis and exergy analysis. The energy analysis provides only the information about how much of fuel energy is converted to engine power. On the other hand, the exergy analysis can identify better than energy the thermodynamic inefficiencies, environmental benefits and impacts and economic issues of thermal systems. Exergy is a measure of the quality of an energy form (Rosen et al., 2008). Exergy analysis is one of the main methods and tools for elaborating environment, ecology and sustainable development policies and strategies (Bilgen and Sarıkaya, 2015). The main goals of this study are (i) offering the energetic and exergetic performance parameters to determine the sustainability performance of aircraft engines, (ii) applying this methodology for J79-GE-17 turbojet engine with afterburner system for maximum operation mode with no-afterburner (MIL) and maximum operation mode with afterburner (AB), and (iii) comparing the results of MIL operation mode with the results of AB operation mode. Methods / Analysis The energy and exergy analyzing methodology and their performance metrics are given as follows (Balli, 2017): Results For MIL mode, the specific fuel consumption and specific thrust of the engine are calculated to be 0.0268 kg/s/kN and 0.6595 kN/kg/s, respectively. At the AB operation, the specific fuel consumption and specific thrust of the engine are obtained to be 0.0712 kg/s/kN and 1.0757 kN/kg/s. The engine power (kinetic energy or exergy of exhaust gases) is found to be 16368.66 kW at MIL and 41168.14 kW at AB operation. The energy efficiency of engine is accounted to be 28.01% for MIL mode and 16.28% for AB mode. According to exergy analysis, the fuel exergy rates of MIL and AB operations are computed to be 62032.27 kW and 268501.32 kW, respectively. In this situation, the exergy efficiency of engine is determined to be 26.39% for MIL mode and 15.33% for AB mode. The performance metrics such as fuel exergy waste ratio, productivity lack ratio, waste exergy cost rate, environmental effect factor, ecological effect factor, sustainable efficiency factor and exergetic sustainability index are found to be 73.61%, 278.97%, 25.37x10-3 kW/$, 2.790, 3.790, 1.358, and 0.358 for MIL operation when they are calculated to be 84.67%, 552.21%, 126.30x10-3 kW/$, 5.522, 6.522, 1.181, and 0.181 for AB operation. System Description The J79 turbojet engine with afterburner system have been used on F-4, RF-4, F-104 and IAI Kfir aircrafts since 1952. In this study, the J79-GE-17 engine model that is installed on F-4/2020 aircrafts in Turkish Air Forces is investigated. The major sections of the engine are shown in Fig.1. The technical, measured and calculated data of the engine for maximum operation mode (MIL) with no-afterburner and maximum operation mode (AB) with afterburner are given in Table 1 (Daly and Gunston, 2008; ASCM, 2017). Table 2. The performance metrics of J79-GE-17 engine Conclusion The energetic and exergetic performance evaluation of the J79-GE-17 turbojet engine with afterburner system are investigated in this study. The performance assessment is examined for both MIL and AB operation modes. The main findings indicate that afterburner operation decreases the energetic and exergetic performances of engine while it affects adversely the environmental, ecological and sustainability metrics of the engine. As a conclusion, the suggested methodology in this study can be used to investigate and compare the gas turbine engines used on aviation sector. Fig.1. The sections of J79-GE-17 engine Table 1. Technical and calculated data of the engine References ASMC.,2016, 1’st Air Supply and Maintenance Center. Turkish Air Forces.Engine Test Cell Record Documents. Eskisehir,Turkey. Balli, O., 2017, Exergy modeling for evaluating sustainability level of a high by-pass turbofan engine used on commercial aircrafts. 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