Three-dimensional optimal design of a cooled turbine considering the coolant-requirement change
| Autor: | Xuesong Li, Wei Ba, Zi-yuan Wang, Chun-wei Gu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Optimal design
Materials science 020209 energy Nuclear engineering Physics QC1-999 General Physics and Astronomy 88.05.bc 02 engineering and technology Turbine Coolant cooled turbine 020401 chemical engineering 47.60.dx 0202 electrical engineering electronic engineering information engineering coolant requirement blade twist 0204 chemical engineering compound lean comprehensive efficiency |
| Zdroj: | Open Physics, Vol 17, Iss 1, Pp 768-778 (2019) |
| ISSN: | 2391-5471 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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