Flow and Heat Transfer Characteristics of the Turbine Blade Variable Cross-Section Internal Cooling Channel with Turning Vane
Abstract
:1. Introduction
2. Research Object and Numerical Analysis Model
2.1. Research Object
2.2. Parameter Definitions
2.3. Numerical Method
3. Results and Discussion
3.1. Comprehensive Performance under Stationary Condition
3.2. Comprehensive Performance under Rotating Condition
4. Conclusions
- (1)
- When stationary, after arranging the turning vane, the wall Nu of each region increases in different degree with the arguments of the turning vane thickness, especially for the turning zones and the tip wall. The turning vane can ameliorate the flow separation phenomenon at inlets of pass2 and pass3. Moreover, affected by the rectification of the turning vane, the uniformity is improved in pass2 and pass3, which reduces the disturbance and weakens the heat transfer there.
- (2)
- In the range of Re = 10,000–50,000, as the turning vane thickness increases, the Nu of the turning area and the tip wall increases. Compared with case1, the Nuup/Nu0 is increased by 56.5% at the maximum (case6, Re = 50,000), f/f0 is reduced by 14.2% at the maximum (case2, Re = 10,000), and the TP is increased by 4.5% at the maximum (case2, Re = 10,000). When Re is low (Re ≤ 30,000), the turning vane with smaller thickness should be selected, and when Re is high (Re > 30,000), the turning vane with larger thickness is better.
- (3)
- When rotating, the wall Nu of pass1 and pass3 has a relative relationship of ‘RSTR > RSLE’, while the Nu presents a state of ‘RSLE > RSTR’ in pass2 owing to centrifugal force and Coriolis force. The Nu of turning zones and the tip wall in channels with turning vane also improves remarkably. The improvement degree increases with the increase of the turning vane. Under the influence of turning vane, the velocity of fluid in pass2 and pass3 is lower, while the Nu of the RSLE in pass2 and the RSTR in pass3 are significantly reduced.
- (4)
- In the range of Ro = 0–0.5 under rotating condition, compared with case1, the Nuup/Nu0 is increased by 33.0% at the maximum (case6, Ro = 0.1), and the Nuall/Nu0 is increased by 4.0% at the maximum (case6, Ro = 0.1).
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Surface | PS1 | PS2 | PS3 | SS1 | SS2 | SS3 |
---|---|---|---|---|---|---|
δ/mm | 1.44 | 2.16 | 1.80 | 2.40 | 2.16 | 1.80 |
r/mm | 5.22 | 7.83 | 6.53 | 8.70 | 7.83 | 6.53 |
Model | Case1 | Case2 | Case3 | Case4 | Case5 | Case6 |
---|---|---|---|---|---|---|
d/D | 0 | 0.06 | 0.12 | 0.18 | 0.24 | 0.30 |
Parameters | Value |
---|---|
Heat flux density on PS, SS, and tip wall surface | 5000 [W·m2] |
Inlet temperature | 298.15 [K] |
Inlet turbulence intensity | 5% |
Outlet pressure | 1 [atm] |
Variable | Grid1 | Grid2 | Grid3 | Grid4 | |
---|---|---|---|---|---|
Number of grids (106) | 0.79 | 1.44 | 2.33 | 4.40 | |
Stationary Re = 10,000 | Nuup | 104.1 | 101.1 | 99.1 | 98.7 |
Relative deviation (%) | 5.5 | 2.4 | 0.4 | - | |
Δp [Pa] | 1557 | 1507 | 1484 | 1471 | |
Relative deviation (%) | 5.8 | 2.4 | 0.9 | - | |
Rotating Re = 10,000 Ro = 0.1 | Nuup | 105.8 | 103.2 | 100.7 | 100.4 |
Relative deviation (%) | 5.4 | 2.8 | 0.3 | - | |
Δp [Pa] | 1144 | 1093 | 1080 | 1075 | |
Relative deviation (%) | 6.4 | 1.7 | 0.5 | - |
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Xu, T.; Shi, D.; Zhang, D.; Xie, Y. Flow and Heat Transfer Characteristics of the Turbine Blade Variable Cross-Section Internal Cooling Channel with Turning Vane. Appl. Sci. 2023, 13, 1446. https://doi.org/10.3390/app13031446
Xu T, Shi D, Zhang D, Xie Y. Flow and Heat Transfer Characteristics of the Turbine Blade Variable Cross-Section Internal Cooling Channel with Turning Vane. Applied Sciences. 2023; 13(3):1446. https://doi.org/10.3390/app13031446
Chicago/Turabian StyleXu, Tao, Dongbo Shi, Di Zhang, and Yonghui Xie. 2023. "Flow and Heat Transfer Characteristics of the Turbine Blade Variable Cross-Section Internal Cooling Channel with Turning Vane" Applied Sciences 13, no. 3: 1446. https://doi.org/10.3390/app13031446
APA StyleXu, T., Shi, D., Zhang, D., & Xie, Y. (2023). Flow and Heat Transfer Characteristics of the Turbine Blade Variable Cross-Section Internal Cooling Channel with Turning Vane. Applied Sciences, 13(3), 1446. https://doi.org/10.3390/app13031446