| Autor: |
Wang, Naian, Yang, Huan, Luo, Dan, Qi, Yinke, Huang, Diangui |
| Zdroj: |
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science (Sage Publications, Ltd.); Oct2023, Vol. 237 Issue 19, p4380-4395, 16p |
| Abstrakt: |
Conventional 1D turbine aerodynamic designs are usually completed by using 2D Smith Chart, which has many limitations (especially the reaction degree of blade is restricted to be about 0.5), and significantly limits design efficiency. In order to eliminate the limitations of the traditional Smith Chart, this paper proposes to take the reaction degree as a third axis, to expend the original 2D Smith Chart to a 3D diagram, which could be used to guide the blade profile design under different blade reaction degrees. The design and numerical calculations of blade profiles are carried out for some operating points in the 3D Smith diagram. It is numerically verified that the relationship between load coefficient, flow coefficient, and efficiency of blade profile under different reaction degrees (0.1–0.7) are consistent with the newly proposed Smith diagram. In addition, a new method of long blade design is proposed: using the 3D Smith diagram to guide the design of blade profiles corresponding to the given radial reaction degree distribution law of the blade, then the long blade is obtained by stacking these blade profiles along the center of gravity. After that the 3D numerical simulation of the obtained 3D blade is carried out to obtain a new radial reaction degree distribution law. The above steps must be repeated until the radial reaction degree distribution can meet the design requirements. The design parameters of high pressure single-stage axial turbine (expansion ratio is about 4.3) are used for the long blade design. The whole stage is calculated by a 3D steady numerical simulation method. The results are consistent with the 1D design value, and the error between total to static and total to total efficiency is less than 3%. It is shown that the 3D design method is instructive for axial turbine long blade design. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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