Fuel and Combustion

Fuel and Combustion

Effect of Time Rupture Prediction Model on Creep Life Estimation of V94.2 Engine Combustor

Document Type : Original Article

Authors
Seyyedeh Fateme Mousavi 1
Mahdi Baghaee 2
Ghazaleh Ahmadi 3
Reza Golestani 3
Sina Sani 3
MohammadAli Soroudi 3
Hiwa Khaledi 4
1 Department of Combustion Chamber, Turbotec co., Tehran, Iran,
2 Department of Combustion Chamber- Turbotec Co- Tehran- Iran
3 Department of Combustion Chamber, Turbotec co., Tehran, Iran
4 Turbotec co., Tehran, Iran
10.22034/jfnc.2022.337639.1317
Abstract
V94.2 gas turbine is one of the most widely used gas turbines for power generation in Iran. In this study, a brief literature review of damage analysis and life estimation of V94.2 combustor is presented accompanied with aerothermal and thermomechanical analyses in the real operation condition. Since creep failure is one of the limiting factors in the life time of combustion chambers, creep life prediction is insvestigated in this paper. Creep time rupture prediction is one of the most important steps of the creep life calculation. Therefore, first, aerothermal and structural analyses are performed considering the effect of the creep failure on the combustion chamber. Next, creep time rupture is calculated using two well-known methods: Larson-Miller and Sherby-Dorn parameters. These parameters for IN617 are extracted as a function of stress based on creep experimental data. The accumulated creep damages of 40’000 hours of full-load operation in the combustion chamber are reported for both above methods. Critical nodes limiting the component life are diagnosed from the detected critical creep damage region. According to the results, the creep rupture time prediction technique plays a vital role in the specification of critical creep damage region, temporal damage variation and consequently, creep life estimation. Therefore, the calculated damage from one technique can be three times greater than the results from the other technique.
Keywords
Creep life assessment
Combustion Chamber
V94.2 gas turbine
Time-temperature parameter
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