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• W4319304567 endingPage "120175" @default.
• W4319304567 startingPage "120175" @default.
• W4319304567 abstract "Experimental investigations have been carried out to study the effects of the film hole pitch-to-diameter ratio (P/D), blowing ratio (M) and rotation on the leading edge (LE) region film cooling performance of a twist turbine blade under rotating conditions. The thermochromic liquid crystal (TLC) technology was applied to measure the LE surface temperature. All experiments were performed at the rotating speed of 574 r/min with the average M varying from 0.5 to 1.25. The Reynolds number (Re) based on the mainstream velocity of the turbine outlet and the test blade chord length was maintained at 6.4 × 104. The coolant-to-mainstream density ratio (DR) was 1.04 with N2 as the coolant. The hole pitch-to-diameter ratios tested were P/D = 2.5, P/D = 3.75 and P/D = 5.0, respectively. The experimental results indicate that both the P/D and the M play an indispensable role in influencing the film cooling performance on the LE under rotating conditions. Regardless of the value of film hole P/D, the spanwise average film cooling effectiveness (η) increases gradually with increasing the M on the LE region under rotating conditions. For all hole P/D cases, the experimental results indicate that the level of spanwise average η provided by the PS region (-4.3 < X/D < 0) is higher than that provided by the SS region (0 < X/D < 3.75) in the LE region when the M was unchanged under rotating conditions. For all M cases, the spanwise average η indicates the decreasing trend with increasing the hole P/D. For all hole P/D cases, the area average η increases gradually with increasing the M. For all M cases, the area average η decreases gradually with increasing the hole P/D. And the reduction is sometimes non-linear to the P/D change. Under the condition that the coolant jet mass flow rate (MFR) remains constant, the area average η decreases gradually with increasing the hole P/D." @default.
• W4319304567 created "2023-02-07" @default.
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• W4319304567 date "2023-05-01" @default.
• W4319304567 modified "2023-09-23" @default.
• W4319304567 title "Film cooling effectiveness of a leading-edge cooling array of a rotating turbine blade with twist" @default.
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• W4319304567 doi "https://doi.org/10.1016/j.applthermaleng.2023.120175" @default.
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