Convective cooling model for aero-thermal coupled through-flow method

Ba, Wei; Gu, Chen; Ren, Xiaodong; Li, Xuesong

doi:10.1177/0957650916685911

Cited by 3 publications

(7 citation statements)

References 20 publications

(33 reference statements)

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“…A schematic of the node-branch network is shown in Figure 6, where the number of each node and branch is marked on the figure, and the positive direction of each branch is also indicated. Then, the matrix A can be written as follows In comparison with the former cooling model, 15 this cooling model based on the thermo-fluid network is able to calculate the mass flow rate and pressure distribution of the internal cooling channel. Therefore, a water distribution network without heat transfer was selected to verify the new function.…”

Section: Topology Analysis Of Thermo-fluid Networkmentioning

confidence: 99%

“…Therefore, the governing equation of energy balance between adjacent calculation stations is re-derived, and the cooling influence is considered as historical, which is the same method for dealing with viscous loss. For more details, one can refer to the literature 15 by the same author.…”

Section: Main Flow Aerodynamic Calculationmentioning

confidence: 99%

“…In comparison with the former cooling model, 15 this cooling model based on the thermo-fluid network is able to calculate the mass flow rate and pressure distribution of the internal cooling channel. Therefore, a water distribution network without heat transfer was selected to verify the new function.…”

Section: Blade Wall Heat Transfer Calculationmentioning

confidence: 99%

“…Based on thermo-fluid network analysis, in this paper, a new cooling model for the aero-thermal coupled through-flow method is proposed. In comparison with the original cooling model, 15 the new model can be used to simulate the pressure loss and mass flow rate of internal cooling channels; therefore, it can also be used to simulate flow conditions in complex internal cooling channels. Based on the circumferential average main flow parameters resulting from the through-flow calculation, flow parameters near the blade surfaces can be estimated by means of the approximate analysis method provided by Torbidoni and Horlock, 16 then the heat transfer calculation boundary conditions can be determined.…”

Section: Introductionmentioning

confidence: 99%

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Aero-thermal coupled through-flow method for cooled turbines with new cooling model

Ren

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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The aero-thermal-coupled phenomenon is significant in modern cooled turbines, and an aero-thermal coupled throughflow method has previously been developed by the authors for considering the influence of heat transfer and coolant mixing in through-flow design. However, the original cooling model is not capable of calculating the distribution of the coolant mass flow rate and pressure loss in complex cooling structures. Therefore, in this paper, a one-dimensional flow calculation for the internal coolant is introduced into the heat transfer calculation to further improve the through-flow cooling model. Based on various empirical correlations, the cooling model can be used to simulate different cooling structures, such as ribbed channels and cooling holes. Three operating conditions were selected for verification of the NASA-C3X vane, which has 10 internal radial cooling channels. The calculated Nusselt number of internal cooling channels strongly agrees with the experimental data, and the predicted blade surface pressure and temperature distributions at mid span are also in good agreement with the experimental data. The convergence history of the meridional velocity and blade surface temperature demonstrates effective convergence properties. Therefore, the aero-thermalcoupled through-flow method with the new cooling model can provide a reliable tool for cooled turbine through-flow design and analysis.

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Section: Topology Analysis Of Thermo-fluid Networkmentioning

confidence: 99%

Section: Main Flow Aerodynamic Calculationmentioning

confidence: 99%

Section: Blade Wall Heat Transfer Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aero-thermal coupled through-flow method for cooled turbines with new cooling model

Ren

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part A:

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“…Allowable metal-temperature change with bending stress Heat transfer from the mainstream to the coolant[25] …”

mentioning

confidence: 99%

Three-dimensional optimal design of a cooled turbine considering the coolant-requirement change

Wang

et al. 2019

Open Physics

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Cooling technology is widely applied in modern turbines to protect the turbine blades, and extracting high-pressure cooling air from a compressor exerts a remarkable influence on the gas-turbine performance. However, the three-dimensional optimal design of a turbine in modern industrial practice is usually carried out by pursuing high component efficiency without considering possible changes in coolant requirement; hence, it may not exactly lead to improvement in the gas-turbine cycle efficiency. In this study, the turbine stator was twisted and leaned to achieve higher comprehensive efficiency, which is the cycle-based efficiency definition for a cooled turbine that considers both turbine aerodynamic performance and coolant requirement. First, the influence of twist and compound lean on turbine aerodynamic performance, considering stator-hub leakage, was investigated. Then, a method to predict the coolant requirement for turbines with different stator designs was applied, to evaluate coolant-requirement change at the design condition. The optimized turbines were finally compared to demonstrate the necessity of considering the coolant-requirement change in the optimal design. This indicated that proper twisting to open the throat area in the stator hub and compound lean to the pressure surface side could help improve the cooled-turbine comprehensive efficiency.

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Definition and comparison of mixed expansion efficiency for cooled turbine

Wang

et al. 2018

Applied Thermal Engineering

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Convective cooling model for aero-thermal coupled through-flow method

Cited by 3 publications

References 20 publications

Aero-thermal coupled through-flow method for cooled turbines with new cooling model

Aero-thermal coupled through-flow method for cooled turbines with new cooling model

Three-dimensional optimal design of a cooled turbine considering the coolant-requirement change

Definition and comparison of mixed expansion efficiency for cooled turbine

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