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 vicinity turbine tip was studied by using 3-D simulation GE-E3 first-stage high pressure turbine. Aerothermal performance structure were analyzed with without moving, respectively. Based distribution limiting streamlines vortex structures, influential characteristics between leakage secondary generated studied. Moreover, coefficient at wall investigated. Results show that is changing shroud, location separation-line changes significantly influence flow. The initial delayed axial direction its breakdown point located 65% cross-section. This accelerates mixing loss increase perturbation. addition, it observed average increased obviously 54.8% region surface. However, suction surface decreased 11.9%.