Effect of additional holes on crack propagation and arrest in gas turbine casing

Bazvandi, H.; Poursaeidi, Esmaeil

doi:10.1016/j.engfailanal.2020.104443

Cited by 8 publications

(4 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, the gas turbines for power generation will grow at an annual rate of 3.95% from 2017 to 2026 [3]. However, the performance degradations and gas path faults of gas turbine engines are inevitable during the whole life cycle due to the complex and variable operating conditions [4], hot corrosion [5], high cycle fatigue [6], additional holes [7], and internal leakage [8]. They are usually reflected by abnormal gas path parameters.…”

Section: Introductionmentioning

confidence: 99%

Gas path fault diagnosis for gas turbine engines with fully operating regions using mode identification and model matching

Huang¹,

Ma²,

Jia³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

Gas path fault diagnosis is key to improving the reliability and safety of gas turbine engines. Flexible operating conditions bring obstacles to performing accurate gas path performance analysis. Most of the existing methods are developed for specific operating conditions, which are difficult to adapt to fully operating regions. The operating mode identification and targeted diagnostic model matching are effective technologies to solve the gas path fault diagnosis under fully operating regions, which improves diagnostic accuracy and efficiency. The fully operating regions are classified into four typical operating modes, and the targeted diagnostic models are matched according to the mode features. For the typical start-stop state and high dynamic state, the small deviation diagnostic model and transient diagnostic model are established and verified by real fault cases. The small deviation diagnostic model based on boundary parameters reduces the influences of operating conditions on diagnostic results, it accurately monitors the health states. The transient diagnostic model driven by the dynamic model and a designed hybrid solution algorithm markedly improves diagnostic accuracy and efficiency. It shows better performance for the mixed gas path fault modes, more stable diagnostic results, and higher diagnostic efficiency. The proposed technical framework provides an effective way for the fault diagnosis of gas turbine engines under fully operating regions.

show abstract

Section: Introductionmentioning

confidence: 99%

Gas path fault diagnosis for gas turbine engines with fully operating regions using mode identification and model matching

Huang¹,

Ma²,

Jia³

et al. 2022

Meas. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…Due to sudden changes in geometry and load, the areas near the holes are prone to stress concentration [1], which may become a potential inducement to reduce the product's overall life. Especially for the high-temperature components of an aero-engine, the alternating loads at high temperatures make it easy to produce fatigue cracks in the high-stress areas around the holes [2,3]. These cracks may extend to nearby load-bearing structures and eventually lead to structural failure.…”

Section: Introductionmentioning

confidence: 99%

Stress Optimization of Vent Holes with Different Shapes Using Efficient Switching Delayed PSO Algorithm

et al. 2022

View full text Add to dashboard Cite

An effective integrated design optimization method is developed to reduce the maximum von Mises stress around vent holes of a high-pressure turbine sealing disk. It mainly includes four different shape designs (circular, elliptical, race-track, and four-arc) for holes, an updated self-developed modelling and meshing tool, an APDL-based strength analysis, and a self-proposed efficient switching delayed particle swarm optimization (SDPSO) algorithm. The main idea of SDPSO is: (1) by evaluating an evolutionary factor and utilizing a probability transition matrix, a non-homogeneous Markov chain is determined and auto-updated in each generation; (2) the evolutionary factor and the Markov chain are used to adaptively select the inertia weight, acceleration coefficients, and delayed information to adjust the particle’s velocity. The performance of SDPSO is evaluated through two benchmark optimization problems with constraints. The results show that SDPSO is superior to two well-known PSO algorithms in optimization capability, numerical robustness, and convergence speed. Furthermore, SDPSO is used for the stress optimization of vent holes with four different shapes. The results show that: (1) SDPSO is suitable and valuable for practical engineering optimization problems with constraints; (2) the developed integrated design optimization method is effective and advanced for reducing the maximum von Mises stress around the vent holes; and (3) the four-arc hole has more tremendous advantages in reducing the maximum von Mises stress, followed by the elliptical hole, the race-track hole, and the circular hole.

show abstract

“…It is known that mechanically fastened joining, such as pins, rivets, and bolts, is an important joining method widely applied to aerospace, construction, machinery, railway, and automotive industries because mechanical joining is the only form that permits disassembly without causing any damage to the structure. [1][2][3][4][5][6] Accurate and proper designs of mechanically fastened joints require the determination of stress distribution at the contact surface, which can determine the strength of joints. 7,8 Three basic approaches are used to analyze the problems of failure mechanism, stress distribution, and stress concentration.…”

Section: Introductionmentioning

confidence: 99%

Stress and Deformation Distribution and Microstructure Changes Around Pin-Loaded Holes in Medium Manganese Steel Plates

Gao

et al. 2021

JOM

View full text Add to dashboard Cite

Effect of additional holes on crack propagation and arrest in gas turbine casing

Cited by 8 publications

References 12 publications

Gas path fault diagnosis for gas turbine engines with fully operating regions using mode identification and model matching

Gas path fault diagnosis for gas turbine engines with fully operating regions using mode identification and model matching

Stress Optimization of Vent Holes with Different Shapes Using Efficient Switching Delayed PSO Algorithm

Stress and Deformation Distribution and Microstructure Changes Around Pin-Loaded Holes in Medium Manganese Steel Plates

Contact Info

Product

Resources

About