Numerical analysis on the influence of the twisted blade on the aerodynamic performance of turbine

• Autorzy: Jin J. , Wang Z. , Cao L.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

turbine; twisted blade; leakage vortex; pressure gradient; tip clearance

• Wydawca: Gdańsk University of Technology, Faculty of Ocean Engineering & Ship Technology
• Czasopismo: Polish Maritime Research
• Rocznik: 2016
• Tom: S 1
• Strony: 86--90
• Opis fizyczny: Bibliogr. 8 poz., rys., tab.

Twórcy

autor

Jin J.

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

autor

Wang Z.

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

autor

Cao L.

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

Bibliografia

• 1. H.S.Chen, S. Kang and C.Q. Tan, “Experiment Research on the Influence of Positive bending of the Blade on the Aerodynamic Characteristics of Penetrated Calm Cascade and Blade”, Engineering Thermophysics Newspaper, no. 2, pp. 179-182, 2002,.
• 2. G Pullan and N.W Harvey, “The influence of sweep on axial flow turbine aerodynamics in the endwall region”, Journal of Turbomachinery, no.130, 2008,.
• 3. M. H. Vand and S. Wang, “Numerical Study of the Effects of Bowed Blades on Aerodynamic Characteristics in a High-pressure Turbine”, American Society of Mechanical Engineers, pp. 487-496, 2005,.
• 4. B.T. An, W.J. Han and Z.Q Wang, “Experience Research on Mechanism of Twisted Blades Reducing Losses”, Thermal Energy Power Engineering, no. 15, pp. 498-501, 2000,.
• 5. Z.M. Feng, W.A. Hang and J.J. Zhong, “Experimental Study on Post-load Positive Bending Cascade Aerodynamic Performance”, Experimental Fluid Mechanics, no. 23, pp.
• 6. H.W. Lu, X.X. Kan and J.J. Zhong, etc. :Analysis of the Flow Structure in Positive Bending Compressor Stationary Guide Blade Passageway”, Engineering Thermophysics Newspaper, no. 34, pp. 1828-1832, 2013,.
• 7. L. Chen, and J. Cheng, “Numerical Investigation on the Influence of Twisted Blades on Turbine Aerodynamic Performance under Stage Environmen”, Aviation Dynamics Newspaper, no. 26, pp. 2765-2711, 2011,.
• 8. Atkins, RJ (Atkins, Rowland J.); Tidd, M (Tidd, Morgan); Ruffo, G (Ruffo, Gord). “Sturgeon Bank, Fraser River Delta, BC, Canada: 150 Years of Human Influences on Salt Marsh Sedimentation”, Journal of Coastal Research, SI 75, pp. 790-794, 2016,.