ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Effect of Squealer Tip Geometry on Rotor Blade Aerodynamic Performance
Received date: 2012-03-19
Revised date: 2012-08-16
Online published: 2012-08-18
Supported by
Fundamental Research Funds for the Central Universities (HEUCFZ1104)
Numerical investigation is performed to simulate the effects of three different tip configurations (cavity tip, cavity tip with streamwise rib, and cavity tip with crosswise rib) on tip leakage flow and aerodynamic performance for the first stage rotor blade in GE-E3 engines, by solving Reynolds-averaged Navier-Stokes equations in conjunction with the standard k-ω two-equation turbulence model. The leakage flow field and loss distribution for the different tip configurations are analyzed; so are the effects of the different tip configurations on rotor overall performance for different tip clearance heights. Also, the off-design characteristics of the cavity tip with crosswise rib are analyzed in detail. Numerical results show that cavity tip with ribs increases the resistance to tip leakage flow, which can reduce the leakage flow rates. Cavity tips with crosswise ribs normal to the local leakage flow direction provide the best off-design performance and exhibit significantly the lowest tip leakage and the best aerodynamic performance, especially for larger tip clearance heights. In addition, the tip leakage flow could do extra work to blades through the sidewall surfaces of the cavity and ribs on condition that it shall not affect the main blade work.
Key words： turbines; squealer tip; tip clearance height; tip leakage flow; rib; angle of attack
GAO Jie , ZHENG Qun . Effect of Squealer Tip Geometry on Rotor Blade Aerodynamic Performance[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(2) : 218 -226 . DOI: 10.7527/S1000-6893.2013.0025
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