关键词: 气膜冷却；平板；热应力；热弹耦合

Abstract: Multi-field coupling calculating method was used to investigate the thermo-elastic characteristics of the flat-plate film-cooling with dual row of holes. The influences on the temperature filed and thermal stress field by blowing ratio，holes’ arrangement，streamwise distance were systematically studied. The results show that the direction of inner force of flat-plate is same as the lateral direction of the cooling holes，and the thermal stress concentrates on the leading edge and trailing edge of the cooling holes. The low-temperature zone，which can determine the location of the extreme value of the thermal stress，relates to the blowing ratio. The jet disturbance and mass flow inequality between the upstream and downstream can lead to the disadvantage of the aligned arrangement. The staggered arrangement，whose cooling performance is generally better than that of the aligned arrangement，has the relative low inner-hole thermal stress while the blowing ratio is less than 1.0. However，the advantage of the staggered arrangement over the aligned arrangement may obviously reduce while the blowing ratio increased to 1.5. The increase of the streamwise distance is helpful to balance the mass flow of the upstream and downstream cooling holes，and is also helpful to decrease the temperature gradient in the flatplate and the thermal stress in the cooling holes.

Key words: Film-cooling；Flat-plate；Thermal stress；Thermo-elastic coupling