This paper describes an experimental activity carried out to investigate the potential of V-shaped holes for film cooling a high-pressure nozzle guide vane. The newly designed V-shaped scheme was compared with standard laidback fan-shaped holes. The influence of showerhead cooling was also assessed. Different injection conditions were examined under the same cascade operating condition using CO2 as a coolant. The quality of holes geometry and their discharging behavior was first characterized. Then, dual-luminophore pressure-sensitive paint (PSP) was used for measuring the adiabatic film cooling effectiveness all over the vane surface. Results of the current work showed that using a V-shaped hole configuration would give nearly the same surface protection as standard shaped holes with a reduced number of holes and, thus, at lower coolant flow consumption.
(2021). V-Shaped Holes for Full Coverage Film Cooling of a High-Pressure Nozzle Guide Vane [journal article - articolo]. In JOURNAL OF TURBOMACHINERY. Retrieved from http://hdl.handle.net/10446/206765
V-Shaped Holes for Full Coverage Film Cooling of a High-Pressure Nozzle Guide Vane
Barigozzi, Giovanna;Abdeh, Hamed;Rouina, Samaneh;
2021-01-01
Abstract
This paper describes an experimental activity carried out to investigate the potential of V-shaped holes for film cooling a high-pressure nozzle guide vane. The newly designed V-shaped scheme was compared with standard laidback fan-shaped holes. The influence of showerhead cooling was also assessed. Different injection conditions were examined under the same cascade operating condition using CO2 as a coolant. The quality of holes geometry and their discharging behavior was first characterized. Then, dual-luminophore pressure-sensitive paint (PSP) was used for measuring the adiabatic film cooling effectiveness all over the vane surface. Results of the current work showed that using a V-shaped hole configuration would give nearly the same surface protection as standard shaped holes with a reduced number of holes and, thus, at lower coolant flow consumption.File | Dimensione del file | Formato | |
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