PENGARUH VARIASI PARAMETER BYPASS RATIO TERHADAP PERFORMA TURBOFAN ENGINE GE-90 DENGAN MENGGUNAKAN SOFTWARE PARA (PARAMETRIC CYCLE ANALYSIS)

GILANG RAMADHAN SYAHRUL ALAM, VIKI (2020) PENGARUH VARIASI PARAMETER BYPASS RATIO TERHADAP PERFORMA TURBOFAN ENGINE GE-90 DENGAN MENGGUNAKAN SOFTWARE PARA (PARAMETRIC CYCLE ANALYSIS). Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

The use of an effective and efficient engines in the operation of the air transport mode is the beginning of improving the management quality of an airline. The development of turbofan engines will be optimized with design and better efficiency in the future, so the analysis of parametric cycle is needed. Parametric cycle analysis to know bypass ratio effects on GE-90 engine’s performance at cruising condition can be done by calculating using parametric of real engine theoretically method also using Parametric Cycle Analysis (PARA) software by varying the bypass ratio and fixed parameters design in addition to engine parameters and ambient parameters by considering losses factor from each component on turbofan engine. Varying parameter value of bypass ratio using PARA software showed the specific thrust and TSFC decrease. Increasing bypass ratio effects on decreased TSFC to point 8,7 of bypass ratio. The specific thrust decreased effects on bypass ratio increased TSFC after bypass ratio reach optimum point at 8,7. The optimum bypass ratio got specific thrust value for 116,1 N(kg/s), thrust specific fuel consumption for 17,02 (mg/s)/N, propulsive efficiency for 81,079 %, thermal efficiency for 42,685 %, and overall efficiency for 34,609 %. Increasing bypass ratio to optimum condition decreased the specific thrust and TSFC according to turbofan engine designed for commercial aircraft to gain engine performances with lower fuel consumption on higher overall efficiency resulted on positive effect when cruising to reduce operational cost and provided the lower jet velocity on lower noise along with contribution of low fuel consumption to reduces exhaust gas emissions.

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