Numerical simulation of 3D viscous flow field of air cooled turbine blades with coolant mixing

摘要

To improve thrust and reduce oil consumption of aero-engines, the temperature at turbine inlet is be-coming higher and higher, which leads to heavy thermal load of vanes. To efficiently cool the vanes, the mass of coolant with its maximum gas mass flow exceeding to 20% of main stream, has to be increased. In the pres-ent paper, a two-stage turbine with and without coolant mixing was simulated by CFX-TASCflow. Simulation re-suits indicate that the flow field structure with coolant is obviously different from that without coolant, and the former has characteristics of lower-speed main flow, reduced roach number, weaker shock intensity and de-creased stage efficiency.