Abstract
U-shaped channel, which is also called two-pass channel, commonly exists in gas turbine internal coolant passages. Ribbed walls are frequently adopted in internal passage to enhance the heat transfer. Considering the rotational condition of gas turbine blade on operation, the effect of rotation is also investigated for the coolant channel which is close to real operation condition. Thus, the objective of this study is to discuss the effect of rotation on fluid flow and heat transfer performance of U-shaped channel with ribbed walls under high rotational numbers. Investigated Reynolds number is Re=12500and the rotation numbers areRob=0.4and 0.6. In the results, the spatially heat transfer coefficient distributions are exhibited to discuss the effect of rotation and roughened walls. It is found that ribbed walls enhance the heat transfer rate significantly. Under the rotational condition, theNuin the first pass with outward flow is increased while that in the second pass is decreased. Finally, averageNuratio, friction ratio, and thermal performance are all presented to discuss the thermal characteristics.
Highlights
Gas turbine is one kind of widely used power machineries which has been applied in land use power generation system and aircraft propulsion
Rib turbulated cooling in internal passage is the most commonly adopted approach in gas turbine blade
Serpentine channel which is called U-shaped channel with a 180 degree sharp bend is more common and complex than straight cooling channel as is discussed by Ekkad et al [9] who considered the effect of secondary flow induced by ribs and 180 degree bend
Summary
Gas turbine is one kind of widely used power machineries which has been applied in land use power generation system and aircraft propulsion. Among these techniques, rib turbulated cooling in internal passage is the most commonly adopted approach in gas turbine blade. Rib turbulated cooling in internal passage is the most commonly adopted approach in gas turbine blade Han and his coworkers [2,3,4,5,6,7,8] have conducted a large amount of research in this area including the discussions of aspect ratio, Reynolds number, channel shape, rib configurations, and so on. Viswanathan and Tafti [12] conducted numerical simulation on a two-pass channel with ribs using the advanced LES (large eddy simulation) and DES (detached eddy simulation) to present the detailed flow characteristics
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