Entropy Generation Calculation of a Turbofan Engine: A Case of CFM56-7B
Entropy Generation Calculation of a Turbofan Engine: A Case of CFM56-7B
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DOI：
10.1515/tjj-2017-0053
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发表时间：
2018-08-01
影响因子：
0.9
通讯作者：
Turan, Onder
中科院分区：
文献类型：
--
作者：
Cilgin, Mehmet Emin;Turan, Onder
近年来，由于燃料成本的上升以及航空排放物对环境的影响，涡扇发动机的熵产和能效成为人们关注的焦点。本文介绍了一种广泛应用于中短程窄体飞机的双轴CFM 56 - 7 B高涵道比涡扇发动机的熵产计算。对发动机五个主要部件进行了熵产和功率分析，得到了起飞推力约为121 kN时的温度-熵、熵-焓、压力-容积图。在研究中，最大熵产生被确定为0.8504 kJ/kg K的燃烧室，而最小熵产生被观察到的值为0.0025 kJ/kg K的低压压气机部件。此外，涡扇发动机的总效率为14%，而推进效率和热效率分别为35%和40%。作为结论，本研究的目的是显示熵的增加，由于不可逆性和生产的功率尺寸的发动机部件的商业涡轮风扇和航空衍生热电联产发电厂。
Entropy generation and energy efficiency of turbofan engines become greater concern in recent years caused by rises fuel costs and as well as environmental impact of aviation emissions. This study describes calculation of entropy generation for a two-spool CFM56-7B high-bypass turbofan widely used on short to medium range, narrow body aircrafts. Entropy generation and power analyses are performed for five main engine components obtaining temperature-entropy, entropy-enthalpy, pressure-volume diagrams at approximate to 121 kN take-off thrust force. In the study, maximum entropy production is determined to be 0.8504 kJ/kg K at the combustor, while minimum entropy generation is observed at the low pressure compressor component with the value of 0.0025 kJ/kg K. Besides, overall efficiency of the turbofan is determined to be 14%, while propulsive and thermal efficiencies of the engine are 35% and 40%, respectively. As a conclusion, this study aims to show increase of entropy due to irreversibilities and produced power dimension in engine components for commercial turbofans and aero-derivative cogeneration power plants.