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指尖密封性能的量化表达和计算效率一直是设计人员关心的问题。针对指尖密封的工作特点,对其泄漏机理和磨损特性进行了分析。基于有限元分析构建了指尖密封性能量化表达的准动态性能模型,解决了理论设计中磨损和泄漏特性难以计算和计算工作量较大的问题。采用该方法的研究结果表明环境温度升高到300℃时,泄漏率较之27oC条件下降低了65%,磨损率升高了约4%;指尖片厚度从0.1mm增加到0.5mm时,泄漏率降低了70%,磨损率升高了28%;同时指尖曲梁个数、转子转速和压差对指尖密封性能同样具有重要影响。分析初步表明,提出的计算方法能够较好地反映指尖密封实际动态特性,为指尖密封性能设计提供了快捷高效计算方法。
The quantitative expression and computational efficiency of fingertip sealing performance has always been a concern for designers. According to the working characteristics of the fingertip seal, the leakage mechanism and wear characteristics were analyzed. Based on the finite element analysis, the quasi-dynamic performance model of the fingertip seal performance is established, which solves the problem of wear and leakage characteristics in the theoretical design and computational workload. The results of this method show that when the ambient temperature is raised to 300 ℃, the leakage rate is reduced by 65% and the wear rate is increased by about 4% compared with that at 27oC. When the thickness of fingertip is increased from 0.1mm to 0.5mm, Leakage rate is reduced by 70% and wear rate is increased by 28%. Meanwhile, the number of fingertips, rotor speed and pressure difference also have an important influence on the fingertip sealing performance. The preliminary analysis shows that the proposed method can reflect the actual dynamic characteristics of fingertip seals and provides a fast and efficient method for the design of fingertip seal performance.