The Influence of Axial Turbine Element Stage Stator/ Rotor Axial Spacing on Flow Status and Performance

摘要

In order to explore the stator/rotor axial spacing influence mechanism on the flow status and performance of the axial turbine element stage, unsteady numerical simulation on 5 turbine element stages with different axial spacing is conducted and the influence of axial spacing on the flow status in the stators and rotors as well as the mass flow, work ability and efficiency of the element stages is investigated. The Results indicate that the axial spacing has little effect on the element stage mass flow and work ability. As the axial spacing decreases, the rotor blocking effect on the stator flow strengthened, the stator outlet pressure increasing, the Mach number and flow deflection angle declining, the stator profile loss rises. Following the increasing of the axial spacing, the circumferential non-uniformity of the rotor inlet pressure, Mach number and flow incidence weakens, but the circumferential non-uniformity of the turbulence kinetic energy strengthens, while the turbulence intensity increases, which strengthens the interaction of the stator wake with the rotor blades and increases the rotor blade profile loss. The element stage efficiency rises as the stator/rotor axial spacing increases in this study.