<abstract xmlns="http://www.w3.org/1999/xhtml"><p> With the gradual increase of the thermal power unit capacity, the inlet steam parameters and flow of the turbine also increase gradually, which causes considerable secondary flow loss. Therefore, studying the causes and distribution of secondary flow loss within the level is of great significance to effectively improve the stage internal efficiency of turbine. Take high-pressure stage moving blade of a turbine as the research object, and adopt the <sup>k-ω</sup>SST model, the SIMPLEC algorithm to numerically simulate the formation and development process of leakage vortex between the tip clearance of the positive bending twisted blade and its effect on the secondary flow of cascade passage. Results show that relative to the conventional twisted blade, the scope of influence of leakage vortex which the steam flow formed near the suction surface of positive bending twisted blade and the disturbance to passage mainstream become smaller, and the increase of tip clearance has weakened the „C“ type pressure gradient of suction surface of the positive bending twisted blade, increased the thickness of the boundary layer at both ends of blades and the loss of the blade end.</p></abstract>

With the gradual increase of the thermal power unit capacity, the inlet steam parameters and flow of the turbine also increase gradually, which causes considerable secondary flow loss. Therefore, studying the causes and distribution of secondary flow loss within the level is of great significance to effectively improve the stage internal efficiency of turbine. Take high-pressure stage moving blade of a turbine as the research object, and adopt the k-ωSST model, the SIMPLEC algorithm to numerically simulate the formation and development process of leakage vortex between the tip clearance of the positive bending twisted blade and its effect on the secondary flow of cascade passage. Results show that relative to the conventional twisted blade, the scope of influence of leakage vortex which the steam flow formed near the suction surface of positive bending twisted blade and the disturbance to passage mainstream become smaller, and the increase of tip clearance has weakened the „C“ type pressure gradient of suction surface of the positive bending twisted blade, increased the thickness of the boundary layer at both ends of blades and the loss of the blade end.

Numerical Analysis on the Influence of the Twisted Blade on the Aerodynamic Performance of Turbine

School of Energy and Power Engineering, Northeast Dianli University, Jilin, Jilin,

Polish Maritime Research

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

With the gradual increase of the thermal power unit capacity, the inlet steam parameters and flow of the turbine also increase gradually, which causes...

Numerical Analysis on the Influence of the Twisted Blade on the Aerodynamic Performance of Turbine

Pubblicato online: 16 nov 2016

Pagine: 86 - 90

DOI: https://doi.org/10.1515/pomr-2016-0050

Parole chiave
Turbine, Twisted blade, Leakage vortex, Pressure gradient, Tip clearance

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Numerical Analysis on the Influence of the Twisted Blade on the Aerodynamic Performance of Turbine

Pubblicato online: 16 nov 2016

Pagine: 86 - 90

DOI: https://doi.org/10.1515/pomr-2016-0050

Parole chiaveTurbine, Twisted blade, Leakage vortex, Pressure gradient, Tip clearance

© 2016

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Parole chiave
Turbine, Twisted blade, Leakage vortex, Pressure gradient, Tip clearance