ANALISIS LIMITASI DIMENSI KETEBALAN SHIM D48 TERHADAP EGTM EFFECT PADA TURBOFAN ENGINE CFM56-7B SERIES

MIFTAKHUDDIN, MUCHAMMAD ARDYANSYAH (2020) ANALISIS LIMITASI DIMENSI KETEBALAN SHIM D48 TERHADAP EGTM EFFECT PADA TURBOFAN ENGINE CFM56-7B SERIES. S1 thesis, Universitas Mercu Buana Jakarta.

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Abstract

Exhaust Gas Temperature Margin (EGTM) is the difference between the maximum temperature limit on the engine and the actual temperature that is read at take-off. EGTM is one of the determinants of good or bad engine performance. The high temperature of the engine will affect the life of the parts or components on the engine. Engine performance is said to be good if EGTM has a number more than zero or has a large difference. One factor that affects the value of EGTM is the clearance in the core module area, specifically the clearance between High Pressure Turbine (HPT) and Low Pressure Turbine (LPT). To get the ideal clearance between HPT and LPT, measurements can be made on the dimensions of the Shim D48 thickness. The thickness of Shim D48 is directly proportional to the amount of clearance. To get the ideal size of Shim D48, rework can be done by applying surface grinding on the Shim D48 with the permissible thickness limit that is 7,889 - 11,059 mm (tolerance  0,1016 mm). The results showed that the shim with the thinnest dimension (9,314 mm) experienced the EGMT effect with the highest value (+7.5 C). In contrast, shim with the thickest dimension (10.19 mm) only experienced an EGTM effect of +6 C. Based on the research results obtained, the thinner the dimensions of the shim, the thinner the clearance produced. The thinner the clearance, the greater the EGTM effect value Keywords: Exhaust Gas Temperature, EGTM Effect, limitation, clearance, Shim D48. Exhaust Gas Temperatur Margin (EGTM) adalah selisih antara batas maksimum suhu pada engine dengan suhu aktual yang terbaca pada saat take-off. EGTM merupakan salah satu faktor penentu baik atau buruknya performa engine. Tingginya suhu engine akan mempengaruhi turunnya umur part atau komponen pada engine. Performa engine dikatakan bagus apabila EGTM memiliki angka lebih dari nol atau memiliki selisih yang besar. Salah satu faktor yang mempengaruhi nilai EGTM adalah clearance pada area core module, khususnya clearance antara High Pressure Turbine (HPT) dengan Low Pressure Turbine (LPT). Untuk mendapatkan clearance yang ideal antara HPT dan LPT, yaitu dapat dilakukan pengukuran pada dimensi ketebalan Shim D48. Ketebalan Shim D48 berbanding lurus dengan besarnya clearance. Untuk mendapatkan ukuran Shim D48 yang ideal, dapat dilakukan rework dengan menerapkan surface grinding pada Shim D48 dengan besaran limit ketebalan yang diizinkan yaitu 7,889 - 11,059 mm (toleransi  0,1016 mm). Hasil penelitian menunjukkan shim dengan dimensi paling tipis (9.314 mm) mengalami EGMT effect dengan nilai tertinggi (+7.5 C). Sebaliknya, shim dengan dimensi paling tebal (10.19 mm) hanya mengalami EGTM effect sebesar +6 C. Berdasarkan hasil penelitian yang didapat, semakin tipis dimensi shim maka semakin tipis pula clearance yang dihasilkan. Semakin tipis clearance, maka semakin besar nilai EGTM effect. Kata Kunci: Exhaust Gas Temperature, EGTM Effect, limitation, clearance, Shim D48.

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