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Numerical study on aerothermal performance of shroud movement in the vivinity of turbine tips

In this paper, the effects of shroud movement on transonic flow and heat transfer in the vicinity of turbine tip was studied by using three-dimensional simulation of GE-E3 first-stage HPT. Aerothermal performance and flow structure were analyzed with and without turbine shroud moving, respectively. Based on the distribution of limiting streamlines and the vortex structures, the influential characteristics between the leakage flow and the secondary flow generated by shroud movement were studied. Moreover, the coefficient of heat transfer at the wall were investigated. Results show that the flow structure is changing with the movement of turbine shroud, and the location of the separation line changes significantly by the influence of the secondary flow. The leakage vortex initial location delayed in axial direction and its breakdown point located at 65% cross section. This accelerates the mixing loss and increase the perturbation. In addition, it is observed that the coefficient of average heat transfer is increased obviously by 54.8% in the region of shroud surface. However, this coefficient in the region of suction surface decreased by 11.9%.
PAPER REVISED: 2020-08-31
PAPER ACCEPTED: 2020-09-24
  1. Bunker, R. S., Axial Turbine Blade Tips: Function, Design and Durability, AIAA Journal of Propulsion and power, 22(2006), 2, pp. 271-285
  2. Dong, H. R., et al., Effect of Vane/Blade Relative Position on Heat Transfer Characteristics in a Stationary Turbine Blade: Part 1-Tip and Shroud, International Journal of Thermal Sciences, 47(2008), 11, pp. 1544-1554
  3. Dong, H. R., et al., Effect of Vane/Blade Relative Position on Heat Transfer Characteristics in a Stationary Turbine Blade: Part 2-Blade Surface, International Journal of Thermal Sciences, 47(2008), 11, pp. 1528-1543
  4. Yu, H. D., Theoretically and Numerically Investigation about the Novel Evaluating Standard for Convective Heat Transfer Enhancement Based on the Entransy Theory, International Journal of Heat and Mass Transfer, 98(2016), 2, pp. 183-192
  5. Vadivelu, M., Parametric Analysis and Optimization of Convective Fin with Variable Thermal Conductivity using Semi-analytical Solution, 36(2018), 2, pp. 677-686
  6. Mayle, R. E., et al., Heat Transfer at the Tip of an Unshrouded Turbine Blade, Seventh International Heat Transfer Conference,1982
  7. Metzger, D. E., et al., Cavity Heat Transfer on a Transverse Grooved Wall in a Narrow Flow Channel, ASME Journal of Heat Transfer, 111(1989), pp. 73-79
  8. Srinivasan, V., et al., Effect of Endwall Motion on Blade Tip Heat Transfer, ASME Journal of Turbomachinery, 125(2003), pp. 267-273
  9. Yang, J. G., et al., Numerical Investigation on Rotating Effects for an Annular Turbine Rotor Csacade, Journal of Propulsion Technology, 38(2017), 10, pp. 2280-2289
  10. Yang, D., et al., Investigation of Leakage Flow and Heat Transfer in a Gas Turbine Blade Tip with Emphasis on the Effect of Rotation, Journal of Turbomachinery, 132(2010), 2, pp. 041010
  11. Thorpe, S. J., et al., An Investigation of the Heat Transfer and Static Pressure on the Over-tip Shroud Wall of an Axial Turbine Operating at Engine Representative Flow Conditions(I) Time-mean Results, International Journal of Heat Fluid Flow, 25(2004), pp. 933-944
  12. Zakaria, M., et al., Computational Investigation of Heat Load and Secondary Flows Near Tip Region in a Transonic Turbine Rotor with Moving Sroud, Applied Thermal Engineering, 136(2018), pp. 141-151
  13. Gao, J., et al., Aerothermal Characteristics of a Transonic Tip Flow in a Turbine Cascade with Tip Clearance Variations, Applied Thermal Engineering,107(2016), pp. 271-283
  14. Timko, L. P., Energy Efficient Engine High Pressure Turbine Component Test Performance Report, NASA Contractor Report 168289
  15. Bunker, R. S., Gas Turbine Cooling: Moving from Macro to Micro Cooling.ASME Turbo Expo: Turbine Technical Conference, GT2013-94277
  16. Celik, I. B., Procedure for Estimation and Reporting of Uncertainy Due to Discretization in CFD Applications, ASME Journal of Fluids Engineering, 130(2008), 7, pp. 780011-780014
  17. Kwak, J. S., Heat Transfer Coefficient on a Gas Turbine Blade Tip and Near Tip Regions, AIAA Paper, 2002, pp. 2002-3012
  18. Azad, G. S., Heat Transfer and Pressure Distributions on a Gas Turbine Blade Tip, ASME Journal of Turbomachinery, 122(2000), 4, pp. 717-724