| Citation: | REN Guozhe, LI Yanpeng, SUN Dan, et al. Numerical study on leakage characteristics of dynamic pressure split floating ring seal with fluid-solid-thermal coupling[J]. Journal of Aerospace Power, 2025, 40（3）：20230261 doi: 10.13224/j.cnki.jasp.20230261
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The fluid-solid-thermal coupling theory of the split floating ring seal was analyzed, and a numerical solution model of fluid-solid-thermal coupling of split floating ring seals with/without grooves was established. On the basis of verifying the accuracy of the numerical method, the flow field characteristics, mechanical characteristics and leakage characteristics of the segmented floating ring seal without shallow groove, rectangular groove and triangular groove under the coupling effect of high temperature and high pressure with different inlet pressure, temperature and speed were studied. The results showed that the fluid-solid-thermal coupling numerical solution model of three kinds of shallow-groove structure floating ring seal can accurately solve the flow field characteristics, mechanical characteristics and leakage characteristics. The fluid moved along the circumferential direction under the action of high-speed shear force, and the local high-pressure zone was generated in the shallow groove structure due to extrusion, which formed the dynamic pressure effect. Under the same inlet pressure condition, the split floating ring seal with triangular groove structure had the largest opening force. When the inlet pressure was 600 kPa, it increased by 9.6% compared with the structure without shallow groove, and the leakage amount was kept relatively small. The temperature had little effect on the opening force of the floating ring, and the higher temperature indicated the smaller leakage amount, the maximum reduction was 6%. The rotating speed had a great influence on the opening force of the floating ring of rectangular groove and triangular groove structure, and the maximum increase was 3.2%, but had little influence on the closing force and leakage.
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