APLIKASI CFD DALAM PENENTUAN PERFORMA MESIN TURBOFAN MODEL CFM56-5B YANG MENGALAMI CACAT PADA KIPAS UNTUK KEPUTUSAN MAINTENANCE

Vicky Wuwung, Puspa Wandani, Carolus Bintoro

Abstract

This paper deals with the study of damage assessment that occurred on the fan blade of turbofan engine CFM 56-5B. The damage requires a maintenance decision, whether a fan blade is still capable to be used or needs to be repaired/replaced. Although regulations stipulate that such damage is still acceptable, but it should be studied in terms of performance, whether the fan still can give a good performance or not. The study was conducted by simulating CF M56-5B on CFD-Numeca software with the fan blade in good and defects conditions. The defects on all the blade is a dent lies on 70% span blade with 0.069” depth on the leading edge to simulate the damage caused by a bird strike. In Numerical simulation, the flow is modeled steady and Spallart- Almaras turbulent model is used . Numerical simulation result show engine performance is reduced in take-off condition for 14% for thrust and 16% for efficiency, and 55% for thrust and 54% for efficiency for cruise condition. This engine performance reduction in take-off condition based on AC 25-13 regulation is definitely save and there is no need of repair or replacement action. Meanwhile, for cruise condition, this engine performance reduction means much higher fuel consumption although safe condition is reached. Thus, based on AC 25-13, engine performance reduction in this case leads to a maintenance decision of no need to repair or replacement action.

 

ABSTRAK

Penelitian ini membahas mengenai kajian kerusakan yang terjadi pada bilah kipas mesin turbofan CFM56-5B. Kerusakan tersebut memerlukan adanya sebuah keputusan maintenance, apakah bilah kipas tersebut masih layak digunakan ataukah perlu di repair atau diganti. Meskipun regulasi menetapkan bahwa kerusakan tersebut masih dapat diterima, namun perlu ditinjau dari segi performanya, apakah kipas masih dapat memberikan performa yang baik atau tidak. Kajian dilakukan dengan menyimulasikan model bilah kipas CFM56-5B pada kondisi baik dan cacat pada perangkat lunak CFD-Numeca di kondisi take-off dan cruise. Cacat pada bilah berupa dent dengan kedalaman 0.069” dan terletak seragam di semua bilah pada 70% span bilah di bagian leading edge sebagai simulasi kerusakan akibat adanya bird strike. Simulasi numerik dilakukan dengan kondisi pemodelan aliran steady, dan menggunakan model turbulen Spallart-Allmaras. Hasil simulasi numerik menunjukkan adanya penurunan performa mesin pada Thrust di kondisi take-off sebesar 14% dan penurunan efisiensi sebesar 16%, sedangkan pada kondisi cruise, penurunan Thrust dan efisiensi berturut-turut adalah sebesar 55%, dan 54%. Penurunan Thrust pada saat take-off berdasarkan regulasi AC 25-13 adalah aman dan tidak perlu dilakukan repair atau replacement. Namun, meskipun aman, mesin akan boros bahan bakar ketika berada dalam kondisi cruise sehingga perlu dilakukan repair atau replacement. Penentuan keputusan maintenance jika didasarkan pada regulasi AC 25-13 pada akhirnya adalah tidak diperlukannya repair atau replacement pada bilah kipas.

Keywords

Bilah kipas CFM56-5B; Kerusakan dent; CFD Numeca; Efisiensi Kipas; Performa mesin; CFM 56-5B Bilah kipas; Dent cacat; CFD Numeca; Efficiency Kipas; Performance

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