Evolution of Rotating Internal Channel for Heat Transfer Enhancement in a Gas Turbine Blade
Abstract
:1. Introduction
2. Influence of Coriolis Force
2.1. Mechanisms of Coriolis Force Effect on Heat Transfer
2.2. Interaction Mechanisms of Coriolis Force and Turbulators on Flow Pattern
3. Utilization of Coriolis Force
3.1. Weakening the Coriolis Force’s Negative Heat Transfer Effect
3.2. Utilizing the Coriolis Force’s Positive Heat Transfer Effect
3.2.1. Principle of Heat Transfer Augmentation and Study State
3.2.2. Heat Transfer Characteristics on Suction and Pressure Sides Compared with Conventional Rotating Channel
4. Reynolds Number Effect on Bilaterally Enhanced U-Channel
5. Conclusions
- For a conventional rotating channel, the trailing wall of the radial outward flow path and the leading wall of the radial inward flow path possess higher heat transfer performance, while the opposite walls perform lower heat transfer. This is because the leading or trailing wall with the Coriolis force pointing at it has Coriolis-induced secondary flow flushing and thus obtains heat transfer augmentation, but the opposite wall has the secondary flow leaving and thus leads to a heat transfer deficit.
- Coriolis-induced secondary flow can interact with the rib-induced secondary flow, leading to heat transfer enchantment or weakened secondary flow. This is because when the circulation directions of the two-type secondary flows are the same, the secondary flow can be enhanced and thus improve heat transfer ability. However, as the circulation directions are opposite, the secondary flow is weakened by each other and can even disappear.
- The channel orientation angle can weaken the strength of the Coriolis force applied on the trailing or leading wall. The reason for this is that there is a component Coriolis force applied on the wall when a channel orientation angle exists and the component Coriolis force is smaller, thus the strength of the Coriolis-induced secondary flow is smaller, leading to the Coriolis force effect being weakened.
- A novel rotating U-channel with a channel orientation angle of 90° (called a bilaterally enhanced U-channel) can utilize the Coriolis force positive heat transfer effect on the leading and the trailing walls at the same time. This is because, according to the right-hand rule, when the main flow goes from the pass near the pressure side and then enters the pass near the suction side, the direction of the Coriolis force can simultaneously point to the leading and trailing walls, causing heat transfer enhancement on both the pressure and the suction sides.
- Based on the non-dimensional equations for a bilaterally enhanced U-channel with incompressible and viscous flow, Re and Ro are vital non-dimensional numbers that influence the performance of a bilaterally enhanced U-channel. Combined with the research results, Ro is good for the heat transfer of bilaterally enhanced U-channels on both the leading and the trailing walls. At the same Ro, Re positively affects the Nu on the leading and the trailing walls of a Coriolis-utilization rotating smooth U-channel but plays a negligible role on Nu/Nu0.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
Nomenclature
Nu | local Nusselt number |
Nu0 | Nusselt number from the Dittus–Boelter correlation |
Nu/Nu0 | Nusselt number ratio |
f | friction factor standing for pressure loss in a pipe |
f0 | friction factor obtained by fully-developed turbulent flow in a smooth duct |
f/f0 | friction factor ratio |
Re | Reynolds number |
Ro | Rotation number |
Buo | Buoyancy parameter |
h | heat transfer coefficient |
Dh | hydraulic diameter |
thermal conductivity | |
Prandtl Number | |
outlet pressure | |
inlet pressure | |
inlet bulk velocity | |
air density | |
channel length from the inlet to outlet | |
fluid kinematic viscosity | |
rotation speed | |
LES | large eddy simulation |
AR | aspect ratio |
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Guo, X.; Li, X.; Ren, J. Evolution of Rotating Internal Channel for Heat Transfer Enhancement in a Gas Turbine Blade. Aerospace 2024, 11, 836. https://doi.org/10.3390/aerospace11100836
Guo X, Li X, Ren J. Evolution of Rotating Internal Channel for Heat Transfer Enhancement in a Gas Turbine Blade. Aerospace. 2024; 11(10):836. https://doi.org/10.3390/aerospace11100836
Chicago/Turabian StyleGuo, Xinxin, Xueying Li, and Jing Ren. 2024. "Evolution of Rotating Internal Channel for Heat Transfer Enhancement in a Gas Turbine Blade" Aerospace 11, no. 10: 836. https://doi.org/10.3390/aerospace11100836
APA StyleGuo, X., Li, X., & Ren, J. (2024). Evolution of Rotating Internal Channel for Heat Transfer Enhancement in a Gas Turbine Blade. Aerospace, 11(10), 836. https://doi.org/10.3390/aerospace11100836