Incidence Adaptation to the Influence of Wake Sweeps on the Aerodynamic Performance of a Low-Pressure Turbine Cascade
Abstract
:1. Introduction
2. Experimental Methods
2.1. Experiment Facility
2.2. Rresearch Object
2.3. Experimental Acquisition Method and Uncertainty
3. Numerical Method
3.1. Calculation Model
3.2. Numerical Calculation and Data Processing
3.3. Numerical Method Verification
4. Results and Discussion
4.1. Overall Performance Analysis
4.2. Flow Characteristics of Cascade Midsection under Wake Sweep
4.3. Flow Characteristics of End Wall Region under Wake Sweep
5. Conclusions
- (1)
- The experimental results show that the cascade’s total pressure loss coefficient decreased first and then increased as the inflow incidence increased from −50° to 20°, and the loss was the least when the inflow incidence is −25°. In the whole experimental inflow incidence range, there was no separation on the cascade suction surface. In particular, when the inflow incidence was 20°, the blade surface still did not separate. Therefore, this blade profile shows good flow characteristics. Thus, the cascade can be considered to be adaptable to the inflow incidence.
- (2)
- Through the numerical calculation, it was found that the unsteady upstream wake flow law is basically the same in the cascade channel when the incoming flow is in the negative incidence range, and the same is true when the incoming flow is in the non-negative incidence range. When the unsteady upstream wake is transported downstream in the cascade channel, the wake near the suction surface departs and hardly interacts with the suction surface’s mainstream fluid. This occurs because the blade suction surface does not separate in all incidences.
- (3)
- The cascade calculation results showed good periodicity in each working condition, which indicates that the unsteady cascade effect was very obvious under the upstream wake sweep. At the same time, it was found that the loss fluctuation range and the incidence characteristic curve in one period showed the same law.
- (4)
- The test results show that the passage vortex losses were almost nonexistent in the negative inflow incidence range. As a result, the losses were mainly concentrated in the wake and the end wall region. In the positive inflow incidence range, with an increase in the inflow incidence, the passage vortex scale gradually increased, and the loss area of the passage vortex increased sharply.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | Units | Values |
---|---|---|
Moving-bar diameter | [mm] | 3 |
Moving-bar span | [mm] | 140 |
Moving-bar pitch | [mm] | 40.87 |
Number of moving bars | - | 63 |
Motor’s rated power | [W] | 70 |
Motor’s rated voltage | [V] | 380 |
Motor’s maximum speed | [r/min] | 2600 |
Motor’s frequency | [Hz] | 50 |
Parameters | Units | Values |
---|---|---|
Chord, C | [mm] | 50.54 |
Axial chord, Caz | [mm] | 40.60 |
Pitch, P | [mm] | 40.87 |
Blade span, H | [mm] | 100 |
Inlet blade angle | [degree] | 19 |
Outlet blade angle | [degree] | 63 |
Parameter Name | Symbol | Error Value |
---|---|---|
Exit’s isentropic Mach number | Ma,iso | 0.14% |
Total inlet pressure | Ptotal,inlet | 0.07% |
Outlet’s static pressure | Pstatic,outlet | 0.07% |
Mainstream temperature | Tmainstream | 0.32% |
Total pressure loss coefficient | Y | 3.6% |
Parameter Name | Units | Value |
---|---|---|
Blade pitch | [mm] | 40.87 |
Moving-bar pitch | [mm] | 40.87 |
Moving-bar movement speed | [m/s] | 20 |
Exit’s isentropic Mach number | - | 0.75 |
Sweep frequency | - | 0.17 |
Cycle count | - | 120 |
The number of iterations | - | 20 |
Time step | [s] | 1.70 × 10−5 |
Case 1 | Case 2 | Case 3 | Case 4 | Case 5 | |
---|---|---|---|---|---|
Level | Extremely coarse | Coarse | Medium | Fine | Extremely fine |
Total number of mesh/(million) | 0.80 | 1.71 | 2.73 | 3.48 | 4.44 |
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Li, X.; Fang, X.; Cai, L.; Wang, L.; Hu, X.; Chen, Y.; Wang, S. Incidence Adaptation to the Influence of Wake Sweeps on the Aerodynamic Performance of a Low-Pressure Turbine Cascade. Aerospace 2024, 11, 569. https://doi.org/10.3390/aerospace11070569
Li X, Fang X, Cai L, Wang L, Hu X, Chen Y, Wang S. Incidence Adaptation to the Influence of Wake Sweeps on the Aerodynamic Performance of a Low-Pressure Turbine Cascade. Aerospace. 2024; 11(7):569. https://doi.org/10.3390/aerospace11070569
Chicago/Turabian StyleLi, Xuejian, Xinglong Fang, Le Cai, Lan Wang, Xinlei Hu, Yingjie Chen, and Songtao Wang. 2024. "Incidence Adaptation to the Influence of Wake Sweeps on the Aerodynamic Performance of a Low-Pressure Turbine Cascade" Aerospace 11, no. 7: 569. https://doi.org/10.3390/aerospace11070569
APA StyleLi, X., Fang, X., Cai, L., Wang, L., Hu, X., Chen, Y., & Wang, S. (2024). Incidence Adaptation to the Influence of Wake Sweeps on the Aerodynamic Performance of a Low-Pressure Turbine Cascade. Aerospace, 11(7), 569. https://doi.org/10.3390/aerospace11070569