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

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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Thermodynamics performance optimization of a hybrid solar gas turbine power plant in Colombia

Journal of Physics Conference Series ◽

10.1088/1742-6596/2163/1/012004 ◽

2022 ◽

Vol 2163 (1) ◽

pp. 012004

Author(s):

F Moreno-Gamboa ◽

J C Acevedo-Paez ◽

D Sanin-Villa

Keyword(s):

Power Plant ◽

Solar Radiation ◽

Gas Turbine ◽

Power Output ◽

Performance Optimization ◽

Pressure Ratio ◽

Direct Solar Radiation ◽

Performance Point ◽

Overall Efficiency ◽

Gas Turbine Power Plant

Abstract A thermodynamic model is presented for evaluation of a solar hybrid gas-turbine power plant. The model uses variable ambient temperature and estimates direct solar radiation at different day times. The plant is evaluated in Barranquilla, Colombia, with a solar concentration system and a combustion chamber that burns natural gas. The hybrid system enables to maintain almost constant the power output throughout day. The model allows optimizing the different plant parameters and evaluating maximum performance point. This work presents pressure ratio ranges where the maximum values of overall efficiency, power output, thermal engine efficiency and fuel conversion rate are found. The study is based on the environmental conditions of Barranquilla, Colombia. The results obtained shows that optimum pressure ratio range for power output and overall efficiency is between 6.4 and 8.3, when direct solar radiation its maximum at noon. This thermodynamic analysis is necessary to design new generations of solar thermal power plants.

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Thermodynamic Optimization of a Gas Turbine Power Plant With Pressure Drop Irreversibilities

Journal of Energy Resources Technology ◽

10.1115/1.2795041 ◽

1998 ◽

Vol 120 (3) ◽

pp. 233-240 ◽

Cited By ~ 56

Author(s):

V. Radcenco ◽

J. V. C. Vargas ◽

A. Bejan

Keyword(s):

Power Plant ◽

Gas Turbine ◽

Flow Rate ◽

Power Output ◽

Pressure Ratio ◽

Plant Size ◽

Fuel Flow Rate ◽

Flow Area ◽

Fuel Flow ◽

Gas Turbine Power Plant

In this paper we show that the thermodynamic performance of a gas turbine power plant can be optimized by adjusting the flow rate and the distribution of pressure losses along the flow path. Specifically, we show that the power output has a maximum with respect to the fuel flow rate or any of the pressure drops. The maximized power output has additional maxima with respect to the overall pressure ratio and overall temperature ratio. When the optimization is performed subject to a fixed fuel flow rate, and the power plant size is constrained, the power output and efficiency can be maximized again by properly allocating the fixed total flow area among the compressor inlet and the turbine outlet.

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ANALYSIS OF THERMAL EFFICIENCY OF OPEN CYCLE GAS TURBINE POWER PLANT AT PUTRAJAYA (MALAYSIA)

Jurnal Teknologi ◽

10.11113/jt.v76.5532 ◽

2015 ◽

Vol 76 (5) ◽

Author(s):

Alhassan Salami Tijani ◽

Mohd Rashid Halim

Keyword(s):

Power Plant ◽

Gas Turbine ◽

Thermal Efficiency ◽

Pressure Ratio ◽

Inlet Temperature ◽

Compressor Inlet ◽

Current Cycle ◽

Open Cycle ◽

Gas Turbine Power Plant ◽

Regenerative Cycle

The purpose of this paper is to study the performance of an existing open cycle gas turbine power plant at Putrajaya power station. At compressor inlet temperature of 298.90K, thermal efficiency of 31 % was observed for the existing or current cycle whiles the modified configuration yielded thermal efficiency of 45 %, this result in 14 % increase in thermal efficiency. At pressure ratio of 3.67, thermal efficiency of about 31.06% and 44% was recorded for the current cycle and regenerative cycle respectively. The efficiency of both cycles increase considerably with increase in pressure ratio, but at pressure ratio of about 7, only a small increase in efficiency for both cycles was observed. The optimum value of the efficiencies for both cycles that correspond to pressure ratio of 7 is 43.06 and 56% for the current cycle and the regenerative cycle respectively.

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Investigation of the Trailing Edge Modification Effect on Compressor Blade Aerodynamics Using SST k-ω Turbulence Model

Aerospace ◽

10.3390/aerospace6040048 ◽

2019 ◽

Vol 6 (4) ◽

pp. 48 ◽

Cited By ~ 1

Author(s):

Kaewbumrung ◽

Tangsopa ◽

Thongsri

Keyword(s):

Gas Turbine ◽

Turbulence Model ◽

Pressure Ratio ◽

Compressor Blade ◽

Base Line ◽

Trailing Edge ◽

Positive Feedbacks ◽

Modification Effect ◽

Edge Modification ◽

Housing Damage

A gas turbine power plant in Thailand had the problem of compressor blade fracture in Stages 6–8, which was caused by housing damage. This gas turbine has a total of 15 stages. The housing damage reduced the lifetime of blades to an unacceptable level. This article shall report the solution and outcomes. Three-dimensional (3D) compressor blade models in the problematic stages were prepared by a 3D scanning machine to find a solution based on computational fluid dynamics (CFD), and then were completed for simulation by adding Stages 5 and 9 to become a multi-stage axial model. The latter models were modified by trimming the trailing edge by 1, 5-, and 10-mm. Using ANSYS CFX R19.2 software, the CFD results of the trailing edge modification effect on flow using the shear stress transport (SST) k-ω turbulence model revealed aerodynamics inside the problematic stages both before and after blade modifications. Modifying the blade by 5 mm was suitable, because it had lesser effects on aerodynamic parameters: pressure ratio, drag, and lift coefficients, when compared to the modification of 10 mm. The larger the modification, the greater the effect on aerodynamics. The effects on aerodynamics were intensified when they were modified by 10 mm. The validation of base line blades was conducted for the overall compressor parameters that were compared with the measurable data. These results were accepted and gave positive feedbacks from engineers who practically applied our reports in a real maintenance period of gas turbine.

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Study of an External Fired Gas Turbine Power Plant Fed by Solid Fuel

Volume 2: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/2000-gt-0015 ◽

2000 ◽

Cited By ~ 4

Author(s):

G. Riccio ◽

F. Martelli ◽

S. Maltagliati

Keyword(s):

Power Plant ◽

Gas Turbine ◽

Solid Fuel ◽

Pressure Ratio ◽

Plant Performance ◽

Current Application ◽

Solid Fuel Combustion ◽

Technical Discussion ◽

External Combustion ◽

Gas Turbine Power Plant

The study of a gas turbine plant fed by solid fuel is discussed in this paper. The plant presented is a small one, 3 MWel, externally fired by the combustion of solid biomass. The aim of the technical discussion is to find both the energetic optimisation and the actual feasibility of the plant through available industrial components (gas turbine, heat exchanger, biomass combustor). The final optimal configuration found in the present study allows for a mix of internal (gas) and external (solid fuel) combustion. In this way higher maximum cycle temperature than in standard biomasss combustors are reached through a small addition of gaseous or liquid fuel. The technical study is based on an optimum size and configuration of the power plant, previously defined, with respect to the performance and the complexity of the plant, and in comparison with other energy conversion processes of biomass such as pyrolysis or gasification. A sensitivity analysis permits the determination an optimal gas turbine in terms of pressure ratio and TIT for the current application and indicates the most important parameters that affect the power plant performance, i.e. the components on which the performance of the plant may depend. Economic data show that the direct external combustion of solid fuel has a more favourable trade-off than the configuration of the plant with gasifier.

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