Structural modification of a steam turbine blade

Heidari, Milad; Amini, Kamran

doi:10.1088/1757-899x/203/1/012007

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…The free-standing blade has low natural frequencies and might be excited by the operational rotational speed. Therefore, in order to increase natural frequencies, design features like snubbers are implemented [10,11]. Unfortunately, these features result in a blade efficiency decrease.…”

Section: Literature Reviewmentioning

confidence: 99%

Archives of Thermodynamics

Bondyra,

Przytulski,

Dominiczak

2022

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Paper is considering the purpose and the process of development of last stage blade for intermediate pressure module of 13K215 steam turbine. In the last 20-30 years most of the steam turbine manufacturers were focused on improving such a turbine mainly by upgrading low pressure module. In a result of such a modernization technology were changed from impulse to reaction. The best results of upgrading were given by developing low pressure last stage blade. With some uncertainty and based on state of art knowledge, it can be stand that improving of this part of steam turbine is close to the end. These above indicators show an element on which future research should be focused on -in the next step it should be intermediate pressure module. In the primary design the height of intermediate pressure last stage blade was 500 mm but because of change of technology this value was decreased to 400 mm. When to focus on reaction technology, the height of the last stage blade is related to output power and efficiency. Considered here is the checking the possibility of implementing blades, in a reaction technology, higher than 400 mm and potentially highest. Article shows a whole chosen methodology of topic described above. It leads through the reasons of research, limitations of 13K215 steam turbine, creation of three-dimensional models, fluid flow calculations, mechanical integrity calculations and proposed solutions of design.

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Section: Literature Reviewmentioning

confidence: 99%

Archives of Thermodynamics

Bondyra,

Przytulski,

Dominiczak

2022

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“…Computer simulation has been used in an important role to study the properties of the SD, such as structural analysis, modal analysis, thermal analysis, fatigue analysis, and AD. In the details of the SD, the structural analysis can predict the profile of stress, strain, and other factors [2][3][4][5][6][7]. For modal analysis, it has been used to figure out the natural frequency, mode shape, and total deformation, among other properties [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…From previous computer simulations, it has been indicated that inappropriate modifications can lead to inefficiency of the generator and also shorten its lifetime. Furthermore, in [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], most researchers focused their study on such conditions (e.g., steady rotational speed, pressure, temperature, and flow rate). Hence, the AD study has been separated from the SD investigation, because simultaneous investigations of both the AD and the SD can be very complex and troublesome.…”

Section: Introductionmentioning

confidence: 99%

A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

et al. 2021

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To solve the housing damage problem of a fractured compressor blade (CB) caused by an impact on the inner casing of a gas turbine in the seventh stage (from 15 stages), modifications of the trailing edge (TE) of the CB have been proposed, namely 6.5 mm curved cutting and a combination of 4 mm straight cutting with 6.5 mm curved cutting. The simulation results of the modifications in both aerodynamics variables Cl and Cd and the pressure ratio, including structural dynamics such as a normalized power spectrum, frequency, total deformation, equivalent stress, and the safety factor, found that 6.5 mm curved cutting could deliver the aerodynamics and structural dynamics similar to the original CB. This result also overcomes the previous work that proposed 5.0 mm straight cutting. This work also indicates that the operation of a CB gives uneven pressure and temperature, which get higher in the TE area. The slightly modified CB can present the difference in the properties of both the aerodynamics and the structural dynamics. Therefore, any modifications of the TE should be investigated for both properties simultaneously. Finally, the results from this work can be very useful information for the modification of the CB in the housing damage problem of the other rotating types of machinery in a gas turbine power plant.

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“…Steam turbine is utilized in different kinds of power generations such as coal-fired power generations, electrical generators, nuclear power generations, gas turbine combined-cycle power generations, etc. (2) . In the steam turbine, the high-pressure, high-temperature steam from nozzle flows in an annular space to the stationary blades and is directed tangentially against the rotating blade.…”

Section: Introductionmentioning

confidence: 99%

“…There are various types of blades that may be classified according to their implementations to the three turbine modules which are: high-pressure turbine, intermediate-pressure turbine and low-pressure turbine. The first two types, high-pressure and intermediate-pressure, are identifies by high temperatures and the fact of them containing small blades which have to maintain small centrifuge forces (2) . Low-pressure turbine blades, designed for the extraction of the final energy remainder from the passing steam flow, are rather large scale rotating air-foils because of the considerable centrifuge forces that are experienced throughout ordinary operations.…”

Section: Introductionmentioning

confidence: 99%

The types of mechanical and thermal stresses on the first stage rotor blade of a turbine

Hannun¹,

Radhi²,

Essi³

2019

innovaciencia

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Introduction: In this paper, the simulation of first stage of low pressure turbine for Nasiriya Power Plant was done to study the aerodynamic characteristic of steam along stage at load 70 MW, also the two types of mechanical stresses on the first stage rotor blade were studied in this paper. Materials and Methods:The material of blade was X20Cr13 stainless steel grade 1.4021. The first type of mechanical stresses which due to the steam pressure on the blade was analyzed. The seconds types of mechanical stresses that the centrifugal stresses on the blade. The AutoCAD software code was used for modeling the turbine stage, the dimensions and operational conditions were obtained practically from Nasiriya power plant and ANSYS (15.0) software was used to make simulate the turbine. Results and Discussion: The results showed that maximum steam velocity occurred at trailing edge of stationary blades and leading edge of rotating blades, also the maximum stresses occurred at the leading edge and trailing edge of root blade, the stresses due to the effect of centrifugal force is larger than the stresses due the pressure force. Conclusions: The maximum deformation occurred at tip of blade and minimum deformation depicted at root of blade.

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Structural modification of a steam turbine blade

Cited by 7 publications

References 9 publications

Archives of Thermodynamics

Archives of Thermodynamics

A Proper Shape of the Trailing Edge Modification to Solve a Housing Damage Problem in a Gas Turbine Power Plant

The types of mechanical and thermal stresses on the first stage rotor blade of a turbine

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