Influence of water–air ratio on the heat transfer and creep life of a high pressure gas turbine blade

Eshati, S.; Abu, Abdullahi O.; Laskaridis, Panagiotis; Khan, Furqan Ahmad

doi:10.1016/j.applthermaleng.2013.06.061

Cited by 22 publications

(14 citation statements)

References 28 publications

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“…Technical challenges to manufacturers: (a) Materials: casing stresses due to thermal gradient; and crack initiation and propagation especially on turbine blading. Moreover, estimating maximum water amount to avoid erosion and corrosion in the compressor [12].…”

Section: Critical Discussion Of Real Engineering Benefits and Problemmentioning

confidence: 99%

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Sustainable energy development in power generation by using green inlet-air cooling technologies with gas turbine engines

Najjar

Al-Zoghool²

2015

J. Engin. Thermophys.

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This paper studies the different greening techniques of inlet air cooling and compares their effects on performance, especially power, efficiency, fuel consumption, and condensable water. A comparison between four air cooling techniques, namely, mechanical chillers, absorption chillers, evaporative cooling and fogging systems was performed on a gas turbine. The performance characteristics were examined for a set of design and operational variables including ambient temperature, relative humidity, compressor pressure ratio, and turbine inlet temperature. The absorption chiller is a single-stage vapor absorption refrigeration system using water-lithium bromide (H 2 O/LiBr) as the working fluid, where the generator and the absorber have fixed temperatures with variation in the heat load (evaporative cooling load) that produces the gas turbine inlet air temperature value of 5 • C. The analysis showed that the evaporative cooling enhanced the power by up to 8.7% and efficiency by up to 3.3%. On the other hand, the fogging system enhanced the power by up to 9.5% and the efficiency by up to 3.5%. The mechanical chiller reduced the temperature by 20 to 45 • C; enhancing the net power by 7 to 24.3% and improving the efficiency by 2.4 to 18.8%, whereas the absorption chillers enhanced the net power by up to 12.1 to 37.3% and improved the efficiency by up to 31.5%.

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Section: Critical Discussion Of Real Engineering Benefits and Problemmentioning

confidence: 99%

“…The excess water fog is carried over by the air stream and evaporates for compressor inlet-cooling and mass flow enhancement. This method can boost power by about 25% independent of ambient temperature conditions [11,12].…”

Section: Wet Compressionmentioning

confidence: 98%

Sustainable energy development in power generation by using green inlet-air cooling technologies with gas turbine engines

Najjar

Al-Zoghool²

2015

J. Engin. Thermophys.

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“…As discussed by Carter [5] the temperature gradient in the hot component of a gas turbine increases with the turbine inlet temperature, causing high thermal stresses which may lead to creep failure of the system. To enhance the efficiency and performance of the gas turbine power plant especially in high temperature ambient conditions, different cooling schemes have been analyzed [6,7] and influence of the water-air ratio on the blade heat transfer and hence the blade creep life of industrial gas turbine has been examined [8].…”

Section: Introductionmentioning

confidence: 99%

Transient heat transfer between a turbulent lean partially premixed flame in limit cycle oscillation and the walls of a can type combustor

Shahi

Kok

Casado

et al. 2015

Applied Thermal Engineering

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“…Besides, they offer 6% higher availability and the possibility of remote operation without operators in continuous attendance and water requirements are less by one third . Because of these important advantages, optimal emissions and performance of STIGs are being studied by many authors . However, this modification requires constant supply of purified water and addition of a heat recovery steam generator.…”

Section: Introductionmentioning

confidence: 99%

Thermoenvironomic evaluation of simple, intercooled, STIG, and ISTIG cycles

Kayadelen

Üst

2018

Int J Energy Res

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Summary Low‐technology cycle modifications available for improving gas turbine performance are still largely unexploited. Among those proven modifications, steam injection is found to be the most effective in boosting both the output capacity and thermal efficiency while reducing NOx emissions. It further improves part load performance under varying ambient conditions. Intercooling is another low‐technology modification which can improve performance of simple and steam injected gas turbine cycles. Because of the uncertainties relating to an efficiency comparison of steam injected and simple cycle designs, the decision as to whether it is worthwhile to give more emphasis to steam injected cycles should be made on grounds other than efficiency alone. Therefore, this study comparatively evaluates simple, intercooled, steam injected (STIG), and intercooled steam injected (ISTIG) gas turbine cycles from the points of efficiency, network output, economics, and pollutant emissions using an advanced validated thermoenvironomic model. Optimum cycle parameters are investigated. Economic feasibility of steam injection and intercooling on simple and intercooled cycles are evaluated using an updated plant cost data. Total and environmental costs as well as profit of the plant owner are estimated for varying fuel costs and varying cycle parameters such as pressure, steam injection, and equivalence ratio. Results of our analysis based on the characteristic cycle parameters show that network output increases up to 22.2% and 14% respectively, when steam injection is implemented on simple and intercooled gas turbine cycles which correspond to up to 6.7% and 4.4% decrease in specific fuel consumption. Steam injection decreases NOx emissions of simple and intercooled cycles up to 67.2% and 65.2% respectively, and provides up to approximately 126.3% increase in net profit of intercooled cycle at the expense of an increase in total cost by 3.3%.

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Influence of water–air ratio on the heat transfer and creep life of a high pressure gas turbine blade

Cited by 22 publications

References 28 publications

Sustainable energy development in power generation by using green inlet-air cooling technologies with gas turbine engines

Sustainable energy development in power generation by using green inlet-air cooling technologies with gas turbine engines

Transient heat transfer between a turbulent lean partially premixed flame in limit cycle oscillation and the walls of a can type combustor

Thermoenvironomic evaluation of simple, intercooled, STIG, and ISTIG cycles

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