Abstract
The effects of dielectric barrier discharge (DBD) plasma on the film cooling effectiveness of a 30-degree slot was experimentally investigated in a low-speed wind tunnel. The pressure sensitive paint (PSP) technique was used to measure the film cooling effectiveness, and two blowing ratios (0.5 and 1.0) were tested. A sinusoidal waveform with a 1-kHz frequency was supplied to the exposed electrode. Two input voltages (6 and 7 kV) and two exposed electrode locations were considered. The results showed that the film cooling effectiveness of the slot was higher for the blowing ratio of the 1.0 case than that for the blowing ratio of the 0.5 case regardless of plasma operation. The higher input voltage case (7 kV) showed higher film cooling effectiveness than the lower input voltage case (6 kV). The improvement in film cooling effectiveness facilitated by the DBD plasma was more significant when the coolant had less momentum. The maximum improvement of the area averaged film cooling effectiveness was 2.3% for the case with the exposed electrode located at the slot exit and a blowing ratio of 0.5.
Highlights
Film cooling is commonly applied to the hot section of a gas turbine in order protect the components from hot combustion gas
The film cooing technique is usually applied to first stage vanes, rotors, and nearby endwalls that operate in high temperature conditions and experience high heat loads [2]
Gao et al [7] and Wright et al [8] installed slots simulating the stator-rotor seal of a gas turbine, and they measured the film cooling effectiveness using the pressure sensitive paint (PSP) technique for different blowing ratios and mainstream turbulence levels. They showed that a high coolant flow rate was required to fully cover the turbine endwall with a single slot, or other discrete holes were required for a smaller coolant flow through the slot
Summary
Film cooling is commonly applied to the hot section of a gas turbine in order protect the components from hot combustion gas. Gao et al [7] and Wright et al [8] installed slots simulating the stator-rotor seal of a gas turbine, and they measured the film cooling effectiveness using the pressure sensitive paint (PSP) technique for different blowing ratios and mainstream turbulence levels They showed that a high coolant flow rate was required to fully cover the turbine endwall with a single slot, or other discrete holes were required for a smaller coolant flow through the slot. DBD plasma was applied to a 30-degree film slot, and the effects of blowing ratio, input voltage, and the location of the electrode on the film cooling effectiveness were experimentally investigated.
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