Failure And Crack Propagation Prediction Analysis Of A Steam Turbine Blades

Kurnia, Fadilah (2019) Failure And Crack Propagation Prediction Analysis Of A Steam Turbine Blades. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Steam turbine blade are an important component in power plant since its function of converting steam flow energy into mechanical energy through rotary shaft. Blades in low pressure (LP) turbine play a critical role in power generation. It is common to find defect in LP turbine’s blade due to critical operating condition and its significant geometry compare to blades in other stages. Failure in turbine blades commonly caused by high cycle fatigue induced by high steam force and centrifugal force. A large number of high-stress cycle may accumulated in certain area which will caused a crack initiation/propagation if there is no any further action. A failure and crack propagation prediction analysis is perform on last stage blades of 670 MW LP steam turbine. Induced force on the body of blade, determined using Computational Fluid Dynamics (CFD) analysis. A crack model is applied to the blade to observe the stress distribution, fatigue life and crack propagation on each crack variations. Finite Element Method (FEM) is done in this present thesis. Analysis result revealed that the highest stress concentration accumulated in bottom tip of leading edge. Number of cycles before a damage occur on the normal condition blade were calculated. Crack growth rate were also calculated. ================================================================================================ Sudu turbin uap merupakan komponen yang penting pada pembangkit energi karena fungsinya yang mengubah energi aliran uap menjadi energi mekanik melalui poros yang berputar. Sudu pada turbin tekanan rendah (LP) memiliki peranan penting pada pembangkit listrik. Menemukan kerusakan pada sudu turbin uap tekanan rendah (LP) merupakan hal yang umum dikarenakan kondisi operasi yang kritis serta ukuran geometri dari sudu terkait yang signifikan dibandingkan sudu pada stage lain. Kegagalan pada sudu turbin umumnya disebabkan oleh kelelahan siklus tinggi yang diinduksi oleh tingginya gaya kerja uap dan gaya sentrifugal. Sejumlah besar siklus tegangan tinggi dapat terakumulasi pada area tertentu yang kemudian akan menyebabkan inisiasi/propagasi retakan jika tidak dilakukan penanganan lebih lanjut. Analisa prediksi kegagalan dan propagasi retakan dilakukan pada sudu di stage terakhir dari turbin uap LP berkapasitas 670 MW. Gaya yang terinduksi pada sudu ditentukan menggunakan analisa Computational Fluid Dynamics (CFD). Model retakan diaplikasikan pada sudu untuk mengamati persebaran tegangan, ketahanan kelelahan dan propagasi retakan pada setiap variasi retakan. Finite Element Method (FEM) dilakukan pada tesis ini. Hasil analisa menunjukan bahwa konsentrasi tegangan tertinggi terakumulasi di ujung bawah tepi depan. Jumlah siklus sebelum kerusakan muncul pada sudu kondisi normal dihitung. Tingkat pertumbuhan retakan juga dihitung.

Item Type: Thesis (Undergraduate)
Additional Information: RSSP 621.165 Kur f-1 2019
Uncontrolled Keywords: Failure Analysis, Fatigue, Crack Propagation, Steam Turbine Blades, Finite Element
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ266 Turbines. Turbomachines (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7 Turbogenerators. Steam-turbines
Divisions: Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User: Kurnia Fadilah
Date Deposited: 23 Dec 2021 01:47
Last Modified: 23 Dec 2021 01:47
URI: https://repository.its.ac.id/id/eprint/61673

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