Gas Turbine Power Augmentation by Overspray Inlet Fogging

Chiang, Hsiao-Wei D.; Wang, Pai-Yi; Tsai, Bor-Jang

doi:10.1061/(asce)0733-9402(2007)133:4(224)

Cited by 16 publications

(6 citation statements)

References 16 publications

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“…This kind of erosion has also been detected on the blades of gas turbine compressors when a fog cooling system is utilized [15,39]. It has been shown that increasing the ambient temperature by 1 • F causes the turbine efficiency to be reduced by 0.3-0.5% [40].…”

Section: Application (Component) Materials Impact Speed Droplet Diame...mentioning

confidence: 92%

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Liquid–Solid Impact Mechanism, Liquid Impingement Erosion, and Erosion-Resistant Surface Engineering: A Review

et al. 2023

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Liquid impingement erosion has been known as mechanical degradation, where the original material is removed progressively from a solid surface due to continued exposure to impacts by high-speed liquid droplets. This is a major issue in many industries, including aerospace and aviation and power generation, particularly gas and steam turbines, nuclear power plants, and wind energy. Tremendous numerical and experimental studies have been performed so far to understand the physical phenomena involved in this process and to improve the erosion resistance of different surfaces. In this review paper, first, the liquid–solid impact in a wide range of relative velocities is reviewed fundamentally. Then, the liquid impingement erosion of metals, including damage regimes and damage accumulation mechanisms, as well as the role of solid properties on erosion performance are explained. Finally, promising water droplet erosion-resistant materials and surface treatments are discussed. This review paper is intended to summarize the present knowledge of the different mechanisms involved in the liquid impingement erosion process.

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Section: Application (Component) Materials Impact Speed Droplet Diame...mentioning

confidence: 92%

“…Water droplet erosion (WDE) is the gradual loss of material owing to the collision of water droplets at sufficiently high speeds [14,15]. WDE is a sub-category of liquid impingement erosion.…”

Section: Introductionmentioning

confidence: 99%

Liquid–Solid Impact Mechanism, Liquid Impingement Erosion, and Erosion-Resistant Surface Engineering: A Review

et al. 2023

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“…The environmental temperature increase will inevitably lead to the air specific volume rising, density dropping, and mass flow increasing inside the gas turbine, and then make the compressor power consumption increase, the net output work, and the thermal efficiency of the gas turbine drop obviously [2]. Most of the gas turbine output power decline of about 0.54%~0.90% is due to per a 1 • C rise of the environmental temperature [3,4]. Reducing the compressor power consumption is significant to improving the gas turbine output.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Analysis of Multistage Compressor Characteristics Under the Spray Atomization Effect Using a CFD Model

et al. 2019

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In this paper, a CFD model is used to simulate the effect of spray atomization at the compressor inlet on a multistage axial subsonic compressor. Special attention is paid to the change of compressor characteristics with wet compression under different rotating speeds to gain the compressor characteristic lines of wet compression. The effects of pneumatic crushing and blade-wall-collision on water droplets and droplet trajectories are contrasted and analyzed under different spray conditions. Then, the whole/stage-by-stage compressor performances and the flow field are also investigated under dry and wet cases near the design operating condition. The results indicate that multistage compressor performance can be improved with wet compression under the proper water spaying rate and a small droplet size. The influence of pneumatic crushing on the water droplets below 20 μm can be ignored, and the effect of blade collision on water droplets above 5μm should be considered in the wet compression conditions. Compared to the dry compression, as measured by volume flow, wet compression with proper spaying conditions makes the front stages operate within a relatively high flow range and the back stages operate within a relatively low flow range. Additionally, the operating state with wet compression is opposite to the compressor operating near the surge boundary, which presents the phenomenon of “former surged and back blocking”.

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“…Chiang et al [27], Sanaye et al [28], and Sanaye and Tahani [29] studied the effects of evaporative cooling process occurring in both compressor inlet duct (inlet fogging) and inside the compressor (wet compression). Kim, K.H.…”

Section: Introductionmentioning

confidence: 99%

Analytical modeling and assessment of overspray fogging process in gas turbine systems

Kim

2015

J. Engin. Thermophys.

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In this study, analysis of the overspray fogging process, which consists of inlet fogging and wet compression processes in gas turbine cycle, is carried out with a non-equilibrium analytical modeling based on liquid droplet evaporation. The transient behaviors of droplet diameter and air temperature are examined. Special attention is paid to the effects of system parameters such as pressure ratio, water injection ratio, and initial droplet diameter on the process performances, including evaporation time of droplets, compressor outlet temperature, and compression work. Process performances are also estimated under the condition of critical water injection ratio above which complete evaporation of injected water droplets within a compressor is not possible. The analytical results indicate that the overspray fogging process has a potential of lowering compressor outlet temperature and saving significant compression work when compared to dry compression, and this technique is more effective for a higher pressure ratio and smaller size of injected water droplet.

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Gas Turbine Power Augmentation by Overspray Inlet Fogging

Cited by 16 publications

References 16 publications

Liquid–Solid Impact Mechanism, Liquid Impingement Erosion, and Erosion-Resistant Surface Engineering: A Review

Liquid–Solid Impact Mechanism, Liquid Impingement Erosion, and Erosion-Resistant Surface Engineering: A Review

Sensitivity Analysis of Multistage Compressor Characteristics Under the Spray Atomization Effect Using a CFD Model

Analytical modeling and assessment of overspray fogging process in gas turbine systems

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