| Citation: | LIU Yuan, LYU Yuanwei, MA Zhaokun, et al. Experiment for flow field and convective heat transfer between rotor and stator with finite length at high rotational speed[J]. Journal of Aerospace Power, 2024, 39（12）：20230001 doi: 10.13224/j.cnki.jasp.20230001
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In order to obtain the thermal flow variation law of the rotation, shearing, eccentricity and other multi-effect coherence in the rotating static micro-clearance, the test method and device for the flow and heat transfer characteristics were established. The omnidirectional pressure and heat transfer coefficient distribution of the rotating Reynolds number of 0—980 and eccentricity of 0—0.6 in the rotating static micro-clearance with clearance ratio of 0.024 were experimentally studied. The results showed that there was a self-acting axial and axial pressure difference as well as end leakage effect under the pressure difference. The gas film pressure gradually decreased from the central section to the axial end along the axial direction, and the gas film pressure was approximately sinusoidal in the circumferential direction. The maximum positive pressure and maximum negative pressure were respectively located near the region 0.22π upstream and 0.24π downstream the minimum gap. The heat transfer on stator surface was influenced by both natural convection and shear flow strengthened by centrifugal force, and the distribution of convective heat transfer coefficient gradually became uniform from non-uniform with the increase of rotational Reynolds number, and the convective heat transfer coefficient gradually increased with the increase of shear flow. Compared with the coaxial condition, in case of eccentricity, the average convective heat transfer coefficient increased by 49.0% at the minimum gap.
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