| Citation: | LI Yelong, ZHAO Huan, SUN Dan, et al. Numerical and experimental investigation on flow and heat transfer characteristics between stages of multi-stage brush seals[J]. Journal of Aerospace Power, 2024, 39（12）：20220308 doi: 10.13224/j.cnki.jasp.20220308
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The flow and heat transfer characteristics between stages of multi-stage brush seals were theoretically analyzed, and the experimental pieces of multistage brush seal with two different structures of raising the blacking plate height and reducing the thickness of brush bundle were designed and machined. The characteristics of leakage and temperature distribution between stages were experimentally studied under high temperature static, normal temperature dynamic and high temperature dynamic conditions. A solution model for the flow and heat transfer characteristics of three-dimensional solid multi-stage brush seals was established, and the influences of operating parameters on flow and heat transfer characteristics of two different structures and the same multi-stage brush seals were studied by numerical and experimental comparison. The research showed that there were two different types of multi-stage brush seals, i.e.: raising the blackplate height and reducing the thickness of brush bundle; their interstage temperature increased with the increase of upstream and downstream pressure difference under high temperature static and dynamic working conditions, and decreased with the increase of upstream and downstream pressure difference under normal temperature dynamic working conditions. In high temperature dynamic working conditions, the interstate temperature was generally larger than that under high temperature static working conditions, and the leakage was generally smaller than that under high temperature static working conditions. The temperature between the second stage of the multi-stage brush seals of the three structures was higher than that between the first stage, the temperature between each stage of the same structure was the highest, the structure of reducing the thickness of the brush bundle was the lowest, the pressure difference between the upstream and downstream of the last stage of the brush bundle of the same structure was the largest, and the pressure drop distribution was the worst. The structure of raising the blacking plate height had the highest leakage, followed by the structure of reducing the thickness of brush bundle, and the structure of the same level had the lowest leakage.
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