ANALISIS PENGARUH KETINGGIAN TERHADAP SPECIFIC FUEL CONSUMPTION ENGINE CFM56-7B26 PADA KONDISI CRUISING

Ali Randongkir, Abubakar (2023) ANALISIS PENGARUH KETINGGIAN TERHADAP SPECIFIC FUEL CONSUMPTION ENGINE CFM56-7B26 PADA KONDISI CRUISING. Thesis thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

In cruising conditions the aircraft is at a stable altitude. Generally, passenger aircraft that use jet engines today roam between 25,000 ft – 43,000 ft. At a certain altitude, air has different densities and temperatures, which affect the performance of aircraft engines. This has an impact on the specific fuel consumption of aircraft engines. Therefore, it is very important to analyze the effect of altitude on the SFC engine CFM56-7B26 in cruising conditions to find out how much influence altitude has on engine performance, in this case the specific fuel consumption of the CFM56-7B26 engine. The method used in this study is the parametric cycle analysis of real engines using the help of Mathcad software. Then analyze the specific fuel consumption which has been affected by variations in temperature and air density values at altitudes of 30,000 ft, 32,000 ft, 34,000 ft, 36,000 ft, and 38,000 ft to find out how the performance is generated from the CFM56-7B2 engine. Variation of the temperature value according to the flight altitude obtained the lowest specific fuel consumption value at an altitude of 30,000 feet with a temperature of 411.75 oR of 12.746 (lbm/h)/lbf and the highest specific fuel consumption value at an altitude of 38,000 feet with a temperature of 389.97 oR of 14.039 (lbm/h)/lbf. And the variation in the air density value according to the altitude, the lowest specific fuel consumption value was obtained at an altitude of 30,000 feet with an air density of 0.0007259 slug/ft3 of 10.459 (lbm/h)/lbf and the highest specific fuel consumption value at an altitude of 38,000 feet with an air density 0.0005258 slug/ft3 of 11.522 (lbm/h)/lbf. The higher the flying altitude, the temperature and air density will decrease, causing the specific fuel consumption value to increase.

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