The pre-swirl system can transfer the cooling air from the compressor to the turbine rotor blades with a lower relative total temperature to avoid extreme thermal shock. This work proposes a novel test rig to investigate the flow and aero-thermal characteristics in a cover-plate type pre-swirl system. The performed experimental and numerical studies focus on the effects of the partial pre-swirl nozzle closing modes on the mass flow rate of air supply, temperature, and uniformities in a pre-swirl system by application of the pre-swirl noz-