Abstract
In this study, two-dimensional heat transfer distribution on the leading surface and trailing surface in a rotating smooth channel with typical boundary condition of four surface heating was investigated experimentally for the first time. The Reynolds number, based on channel hydraulic diameter (80 mm) and the bulk mean velocity, ranges from 15,000 to 30,000, and the highest rotation number is 0.359 with the Reynolds number of 15,000. The mean density ratio is about 0.11 in this work. The obtained result showed that rotation has an important effect on the heat transfer distribution along the span-wise direction. On the leading side, rotation-induced secondary flow makes the Nu/Nu0 at the edge area of the wall surface (Z/D = 0 and Z/D = 1) is higher than that on the middle area (Z/D = 0.5). On the trailing surface, the trend of Nu/Nu0 ratio along the span-wise direction is reversed. Along the stream-wise direction, the Nu/Nus ratio increases with the rotation number monotonously on the trailing side. Howev...
Highlights
The increasing demands about the higher efficiencies of gas turbine engines need the engine designers to develop effective cooling technologies because the turbine inlet temperatures of gas are far beyond the working temperature even melting point of material
Yang et al.[18] experimentally investigated the heat transfer is a smooth rotating multi-passage channel. They discussed about the effect of rotation, turning vane, trailing edge ejection, and channel orientation on heat transfer with the Reynolds number ranging from 10,000 to 40,000 at rotation numbers up to 0.32
The results presented are expressed as Nu/Nu0 to discuss the effect of rotation
Summary
The increasing demands about the higher efficiencies of gas turbine engines need the engine designers to develop effective cooling technologies because the turbine inlet temperatures of gas are far beyond the working temperature even melting point of material. Liou and colleagues[15,16,17] used IR to measure the temperature in a radially rotating twin-pass smooth-walled parallelogram channel with the Reynolds number and rotation number ranging from 5000 to 20,000 and 0 to 0.3, respectively In the experiment, they used two stainless steel heating foils to heat the leading and trailing side, and the other two sides of the channel are cold. Yang et al.[18] experimentally investigated the heat transfer is a smooth rotating multi-passage channel They discussed about the effect of rotation, turning vane, trailing edge ejection, and channel orientation on heat transfer with the Reynolds number ranging from 10,000 to 40,000 at rotation numbers up to 0.32.
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