Analysis of transient radiation-convection coupled effects on the HP turbine blade heat load with hot streak inlet

Wang, Tianyi; Xuan, Yimin; Han, Xingsi

doi:10.1016/j.applthermaleng.2018.04.110

Cited by 20 publications

(5 citation statements)

References 33 publications

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“…(3) In the process of HS migration, the highest (center) temperature falls noticeably due to the heat diffusion, and this phenomenon can also be found by Wang et al [31] . In the three cases, the decline amplitudes of the center temperature are different.…”

Section: Results and Discussion Migration And Decline Of Hsmentioning

confidence: 53%

“…The wall emissivity is set as 0.8, and the "Discrete Transfer" radiation model is selected to solve the radiation equation. However, based on the results of Wang et al [31] , the effect of gas radiation on solid surface is very small, therefore the gas radiation is not considered in the current simulations. To observe the effect of HS on the cooling performances of the two models, the inlet mainstream conditions with HS are simplified, and the two following assumptions and settings are applied in this work: (1) To eliminate the effects of swirling flow, the flow direction at the mainstream inlet is assumed to be perpendicular to the inlet surface.…”

Section: Boundary Conditions and Computational Settingsmentioning

confidence: 99%

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Comparison of Showerhead Film Cooling and Double Wall Cooling in a Guide Vane Leading Edge with Hot Streak

Jinfu,

Yang,

Ran

et al. 2024

JGPP

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Under the realistic running conditions of gas turbines, the temperature at mainstream inlet is always non-uniform due to the effects of combustion process, and different types of hot streak (HS) could be found at the inlet. The existence of HS may result in some potential negative impacts on the cooling performances of vane leading edge (LE). Nowadays, the two configurations, i.e., traditional showerhead film cooling (SFC) and novel double wall cooling (DWC), have been widely used in LE designs of turbine vanes, but until now there is no comprehensive study to evaluate the two models considering HS effects. In this work, using the two cooling structures, four different temperature profiles are considered at the mainstream inlet of the cascade. The results reveal that: in both models, HS could cause a local high-temperature region on LE, and the thermal characteristics of this area are dependent on HS pattern. Compared to SFC, DWC shows a better cooling ability and a lower thermal stress on the vane surface. The cooling characteristics in DWC model are less sensitive to the HS pattern. However, the problem of the extremely high thermal stress within the pin-fins of DWC should be carefully considered.

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Section: Results and Discussion Migration And Decline Of Hsmentioning

confidence: 53%

Section: Boundary Conditions and Computational Settingsmentioning

confidence: 99%

Comparison of Showerhead Film Cooling and Double Wall Cooling in a Guide Vane Leading Edge with Hot Streak

Jinfu,

Yang,

Ran

et al. 2024

JGPP

View full text Add to dashboard Cite

show abstract

“…Conductive heat flux is neglected as it is believed to have little effect on the overall temperature response. Thermal radiation from the hot gas stream has a substantial effect on the overall heat transfer at the vane's external boundary at high temperatures [56,85,122]. However, a possible remedy is to adjust for this effect by increasing the heat transfer coefficient (HTC), such that the apparent HTC includes both convection and radiation effects [88].…”

Section: Delimitationsmentioning

confidence: 99%

Internal Cooling Design Using Multiphysics Topology Optimization

Lundgren

2024

Linköping Studies in Science and Technology. Dissertations

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The author's contributionThe development of the topology optimization models employed in all papers was undertaken by the author in collaboration with co-authors. The author held the principal responsibility for conceptualizing, deriving, simulating, and analyzing the models and the results. All MATLAB implementations in Paper I and the majority of the PETSc/C++ implementations in Papers IV and V were programmed by the author. The CFD analyses in Papers IV and V were conducted by Hossein Nadali Najafabadi, and the numerical examples in Papers II and III were completed by Carl-Johan Thore, based on MATLAB implementations by the author. Papers I, IV and V are credited to the thesis author, reviewed by their respective co-authors, while Papers II and III are co-authored by the thesis author. xiv

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“…It was found that when the HS is facing the stator SS, the secondary flow in the turbine is more intense, and the efficiency of the stage is reduced by 1.26%. Wang et al [6] was not only focused on the changes of HS on the stator but also carried out research on rotors. Ultimately, it was found that the HS migrated stably with the main flow in the NGV channel and gradually separated into two high-temperature areas located at 60% span of the blade and the blade tip in the rotor channel.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hot Streak and Swirl Clocking Position on Aerothermal Performance of High-Pressure Turbine

Yang,

Cai,

Kang

et al. 2023

Aerospace

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In modern civil aeroengines, the hot streak and swirl at the exit of the combustor have a significant impact on the aerothermal performance of the high-pressure turbine (HPT). Due to the different design purposes of the combustor and the turbine, hot streak (HS) and swirl (SW) have different spatial distributions at the turbine inlet. This paper conducts a transient simulation of the GE E3 first-stage HPT, considering the swirl and hot streak facing the middle of the passage and the leading edge of the nozzle guide vane, respectively, and also explores the impact of positive and negative swirl. The results show that different clocking positions and swirl directions will change the incident angle and streamline distribution of the vane, thereby affecting the migration of the hot streak, the temperature and the Nusselt number distribution on the stator surface. In positive cases, the hot streak gathers in the upper part of the passage, and in negative cases, it is in the lower part. In middle cases, high-temperature areas appear in both vanes, and the distributions are opposite. Affected by the swirl, when facing the passage center, the pressure side stagnation lines of the two vanes are also different, so the Nusselt number distribution is opposite. When facing the leading edge, only one vane appears. Due to the insensitive interference of the rotor–stator, the transient migration of the hot streak in the rotor is mainly affected by the inherent secondary flow and the temperature at the inlet of the rotor (especially the conditions facing the leading edge), while the upstream residual swirl is less affected. Unlike the middle case, in leading edge cases, the hot streak is separated and needs to be re-mixed before entering the blade passage, so the temperature change in the blade cascade is relatively gentle. Based on this, the Nusselt number distribution on the surface of the blade is similar. In order to obtain the most favorable operating conditions for the engine, the turbine efficiency is used to compare the aerothermal performance under different conditions. Ultimately, it was found that the turbine with the hot streak and positive swirl directly facing the leading edge was the most efficient.

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Analysis of transient radiation-convection coupled effects on the HP turbine blade heat load with hot streak inlet

Cited by 20 publications

References 33 publications

Comparison of Showerhead Film Cooling and Double Wall Cooling in a Guide Vane Leading Edge with Hot Streak

Comparison of Showerhead Film Cooling and Double Wall Cooling in a Guide Vane Leading Edge with Hot Streak

Internal Cooling Design Using Multiphysics Topology Optimization

Influence of Hot Streak and Swirl Clocking Position on Aerothermal Performance of High-Pressure Turbine

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