Volume 30 Issue 11
Nov.  2015
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Article Navigation >  Journal of Aerospace Power  > 2015  >  30(11): 2638-2646
GAO Jie, ZHENG Qun, LIU Yun-ning, ZHAO Zhan. Investigations on desensitization of blade tip clearance variation in turbine blades[J]. Journal of Aerospace Power, 2015, 30(11): 2638-2646. doi: 10.13224/j.cnki.jasp.2015.11.011
Citation: GAO Jie, ZHENG Qun, LIU Yun-ning, ZHAO Zhan. Investigations on desensitization of blade tip clearance variation in turbine blades[J]. Journal of Aerospace Power, 2015, 30(11): 2638-2646. doi: 10.13224/j.cnki.jasp.2015.11.011
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Investigations on desensitization of blade tip clearance variation in turbine blades

doi: 10.13224/j.cnki.jasp.2015.11.011

  • 1. College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China;

  • 2. Harbin Marine Boiler and Turbine Research Institute, China Shipbuilding Industry Corporation, Harbin 150078, China

  • Received Date: 2014-03-30
  • Publish Date: 2015-11-28
    Abstract
  • Numerical investigation was performed to simulate the sensitivity of turbine performance to blade tip clearance variation for four different tips including flat tip and other three tips: cavity tip, flat tip with injection and cavity tip with injection; passive, active and compound clearance control methods were used respectively by solving Reynolds-averaged Navier-Stokes equations in conjunction with a standard k-ω two-equation turbulence model. The influences on the clearance flow structure and losses caused by tip clearance variation were analyzed. In addition, the variation of the turbine performance which changes by the different clearances was investigated. Furthermore, the sensitivities of the efficiency-gains caused by different clearance control methods to changes in incidence angles were assessed. Results show that, with different clearance control methods, the growth rate of the strength of tip leakage vortex slows down, especially for the compound clearance control method. This leads to the results that the compound clearance control method presents the lowest sensitivity of turbine performance to clearance variation. In addition, only the leakage flows over the front part of the blade are sensitive to incidence angle variation, which causes the best adaptability of cavity tip to incidence angle variation.

     

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