Browsing by Author "Balli, Ozgur"

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Citation - WoS: 21
Citation - Scopus: 24
Comparative performance metric assessment of a military turbojet engine utilizing hydrogen and kerosene fuels through advanced exergy analysis method
(MDPI AG rasetti@mdpi.com Postfach Basel CH-4005, 2020) Burak Yuksel; Ozgur Balli; Huseyin Gunerhan; A. Hepbasli; Yuksel, Burak; Balli, Ozgur; Hepbasli, Arif; Gunerhan, Huseyin
This study dealt with evaluating the (J85-GE-5H) military turbojet engine (TJE) in terms of exergetic and advanced exergetic analyses at Military (MIL) and Afterburner (AB) process modes by utilizing kerosene (JP-8) and hydrogen (H2) fuels. First exergy and advanced exergy analyses of the engine were performed using JP-8 fuel as per actual engine operating conditions. These analyses of the turbojet engine using hydrogen fuel were also examined parametrically. The performance evaluation of the engine was lastly executed by comparing the obtained results for both fuels. Based on the parametric studies undertaken the entire engine’s exergetic efficiency with JP-8 was reckoned 30.85% at the MIL process mode while it was calculated as 16.98% at the AB process mode. With the usage of H2 the efficiencies of the engine decreased to 28.62% and 15.33% for the above mentioned two modes respectively. As the supreme exergy destructions occurred in the combustion chamber (CC) and afterburner exhaust duct (ABED) segments the new technological developments should be considered to design more efficient engines. As a result the engine worked less efficiently with hydrogen fuel due to the enhancement in exergy destructions. Conversely the greenhouse gas (GHG) emission parameters lessened with the utilization of H2 fuel. © 2020 Elsevier B.V. All rights reserved.
Citation - WoS: 91
Citation - Scopus: 96
Energetic and exergetic analyses of T56 turboprop engine
(PERGAMON-ELSEVIER SCIENCE LTD, 2013) Ozgur Balli; Arif Hepbasli; Hepbasli, Arif; Balli, Ozgur
This study presents the results of energetic and exergetic analyses of T56 turboprop engine at various power loading operation modes (75% 100% Military and Takeoff). The energetic and exergetic performance evaluations were made for both the shaft power (Case A) and the shaft power plus the kinetic energy of exhaust gaseous (Case B). The energetic efficiency was calculated to be maximum at 25.4% for Case A and 28.1% for Case B while the exergy efficiency was obtained to be maximum at 23.8% for Case A and 26.3% for Case B at Takeoff mode respectively. The maximum exergy destruction rate occurred within the combustion chamber. It increased from 4846.3 kW to 6234.1 kW depending on operation modes. The exergetic performance parameters such as the relative exergy consumption the fuel depletion ratio the productivity lack ratio the improvement potential and the fuel-production ratio were also investigated. The fuel energy-production ratio decreased from 4.6 to 3.9 while the fuel exergy-production ratio decreased from 4.9 to 4.2 by increasing the produced shaft power and residual thrust. The results provided here can be helpful to regulate and select operation modes for these engine users. (C) 2013 Elsevier Ltd. All rights reserved.
Citation - WoS: 93
Citation - Scopus: 104
Exergoeconomic sustainability and environmental damage cost analyses of T56 turboprop engine
(Elsevier Ltd, 2014) Ozgur Balli; A. Hepbasli; Hepbasli, Arif; Balli, Ozgur
The main objective of this study is to assess the performance of T56 turboprop engine using the exergoeconomic sustainability and environmental damage cost analysis methods at different power loadings. The unit exergy cost of the shaft power decreases from 76.34 $/GJ at 75%-mode to 58.32 $/GJ at Takeoff-mode due to increasing the shaft power. The unit exergy cost of the kinetic exergy increases 599.43 $/GJ at 75%-mode to 666.76 $/GJ at Takeoff-mode because of the unit exergy cost of the exhaust gaseous with the increase in the fuel flow. The sustainability analysis indicates that the gas turbine has the highest sustainability index. Increasing the fuel flow rate raises the environmental pollutants and the environmental damage cost rate. The environmental damage cost rates of the engine are calculated to be 423.94 $/h at 75%-mode 576.97 $/h at 100%-mode 634.93 $/h at military-mode and 665.85 $/h at Takeoff-mode. The total cost rate consists of the sum of the fuel cost the capital investment cost the operating and maintenance costs and the environmental damage cost. The total cost rates of the engine are determined to be 1702.59 $/h at 75%-mode 2100.26 $/h at 100%-mode 2220.42 $/h at military-mode and 2284.50 $/h at Takeoff-mode. © 2013 Elsevier Ltd. © 2017 Elsevier B.V. All rights reserved.