Influence of the upstream slot geometry on the endwall cooling and phantom cooling of vane suction side surface

Du, Kun; Li, Zhigang; Li, Jun; Sundén, Bengt

doi:10.1016/j.applthermaleng.2017.04.143

Cited by 31 publications

(4 citation statements)

References 32 publications

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“…Using the same vane, references [9,21] both adopted the SST k-ω turbulence model. To guarantee the credibility of the predicted results, the numerical method was studied in reference [21] by adopting four turbulence models (standard k-ε, RNG k-ε, standard kω, and SST k-ω turbulence models).…”

Section: Turbulence Modelmentioning

confidence: 99%

“…Using the same vane, references [9,21] both adopted the SST k-ω turbulence model. To guarantee the credibility of the predicted results, the numerical method was studied in ref.…”

Section: Turbulence Modelmentioning

confidence: 99%

“…However, the heat transfer is also improved at the same time [8]. According to Du et al [9], the adiabatic cooling effectiveness in the upstream region is greatly increased by the introduction of the contoured upstream slot. However, the normal upstream slot attains a relatively high adiabatic cooling effectiveness on the endwall.…”

Section: Introductionmentioning

confidence: 99%

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Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Pei

Shan³

et al. 2023

Machines

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Due to machining techniques and dust deposition, gas turbine upstream slots and vane roots are always filleted, significantly affecting the cooling performance of the endwall. The effects of upstream slot fillet and vane root fillet on the cooling performance of the gas turbine endwall were investigated by solving the three-dimensional Reynolds-averaged Navier–Stokes (RANS) equations with the shear stress transport (SST) k–ω turbulence model. The results indicate that the velocity distribution of the slot coolant is effectively changed by introducing the upstream slot fillets. Among the four cases, the largest adiabatic cooling effectiveness was obtained for the case with two similar fillets, with a 42% increase in effective cooling area compared to the traditional slot. At MFR = 0.75%, the horseshoe vortex is weakened by the introduction of the vane fillet with a small radius, with a 53% increase in effective cooling area compared to the baseline. However, the vane fillet with a large radius makes the boundary layer flow separately prematurely, decreasing the cooling performance. The lateral coverage of the coolant jet from the filmhole embedded in the vane root fillet is greatly enhanced by increasing the vane root fillet radius. However, the streamwise coverage is decreased and the thermodynamic loss is increased.

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Section: Turbulence Modelmentioning

confidence: 99%

“…Using the same vane, references [9,21] both adopted the SST k-ω turbulence model. To guarantee the credibility of the predicted results, the numerical method was studied in ref.…”

Section: Turbulence Modelmentioning

confidence: 99%

See 1 more Smart Citation

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Pei

Shan³

et al. 2023

Machines

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“…This enhanced the non-uniform coolant coverage under the effect of lateral flow. In order to obtain a uniform coolant distribution at the upstream slot outlet, Du et al [19] developed a shaped upstream slot. For the shaped upstream slot, the area of the upstream slot presents a direct correlation with the pressure to rearrange the coolant mass flow rate at the slot outlet.…”

Section: Introductionmentioning

confidence: 99%

Influence of the pressure side injection slot on the cooling performance of endwall surface

et al. 2018

Numerical Heat Transfer, Part A: Applications

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In modern gas turbine engines, the first stage vane endwall endures high thermal load with the increase of the turbine inlet temperature and the uniformity of the temperature distribution at combustor outlet. Moreover, the endwall secondary flow forces the coolant flow toward the suction side, resulting in hot regions along the pressure side endwall. In the worst case, hot regions lead to thermal failure. In order to ensure that the gas turbine operates safely, advanced cooling techniques are urgently needed to be implemented to reduce the hot regions along the pressure side endwall. In the current research, the influences of the pressure side injection slot on the film cooling performance of the endwall surface were numerically investigated. The three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations combined with the shear stress transport (SST) k À x turbulence model were solved to conduct the simulations. Cases with different injection slot configurations have been simulated. The results indicate that the hot region along the pressure side endwall is significantly reduced by introducing the pressure side injection slot. The coolant from the pressure side injection slot is assisted by the pressure side vertical flow toward the adjacent vane suction side. Therefore, the coolant coverage and the cooling effectiveness are increased. In this study, the expanded slot (ES) achieves a larger cooling effectiveness than the normal slot (NS) and convergent slot (CS) at a small blowing ratio M ¼ 0.5. In contrast, the CS obtains a larger cooling effectiveness than the NS and ES at M ¼ 1.0 and M ¼ 1.5. In addition, the introduction of the pressure side injection slot has a small influence on the aerodynamic performance of the vane cascade. ARTICLE HISTORY

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Numerical study of the effect of the cavity depth on the leakage control in a cooled honeycomb-tip turbine cascade

Wang

Song

et al. 2018

Applied Thermal Engineering

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Influence of the upstream slot geometry on the endwall cooling and phantom cooling of vane suction side surface

Cited by 31 publications

References 32 publications

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Influence of the Slot Fillet and Vane Root Fillet on the Turbine Vane Endwall Cooling Performance

Influence of the pressure side injection slot on the cooling performance of endwall surface

Numerical study of the effect of the cavity depth on the leakage control in a cooled honeycomb-tip turbine cascade

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