周向收敛与人字槽组合型指尖密封结构与性能分析

摘要: 针对流体动压型指尖密封结构和工作特点,建立了具有周向收敛靴和轴上人字槽组合结构特征的指尖密封(简称组合型指尖密封)结构形式,采用流固耦合数值分析方法,分析了不同结构和工况条件下组合型指尖密封的泄漏率、气膜承载力及气膜流场特征,详细讨论了密封各结构参数变化对组合型指尖密封性能的影响。结果表明:在通常工况范围内,压力流对组合型指尖密封性能的影响占主导地位;楔形气膜膜厚比、楔形气膜径向最小厚度对组合型密封泄漏率影响最大;人字槽偏离高压片的距离、槽纵向间距和槽宽对组合型指尖密封的性能影响较为明显。与现有人字槽型指尖密封和周向收敛型指尖密封的性能相比,组合型指尖密封气膜承载力明显高于人字槽型指尖密封;其泄漏率与周向收敛型指尖密封相当而气膜承载力较大,具有较好的综合性能优势。
- 组合型指尖密封 /
- 流固耦合 /
- 泄漏率 /
- 气膜承载力
Abstract: For the structure and the serviceing condition of a fluid hydrophilic finger seals, a finger seal structure(referred to as combination finger seal)which has the combination of circumferential convergent boots and on a herringbone-Grooved rotor was established. Using the fluid-solid coupling numerical analysis method, the seal leakage rate, the gas film bearing capacity and gas film flow field characteristics of the combination finger seal under the different structure and the serviceing condition was analyzed. And the effects of seal structure parameters on the combination finger sealing performance are discussed in detail. The results show that under the normal operating range, the impact that pressure flow acting on the sealing performance of the combination finger seal has absolute predominance. The thickness ratio and radial minimum thickness of wedge gas film make the maximum influence on the seal leakage rate. The distance herringbone groove deviating from the high-pressure plate, longitudinal spacing and width of the groove have obvious impact on the performance of combination finger seal. Comparing with the performance of circumferential convergent hydrodynamic finger seal and finger seal on a herringbone-grooved rotor, the bearing capacity of gas film of the combination finger seal is apparently higher than it in the finger seal on a herringbone-grooved rotor. The leakage rate of the combination finger seal and the finger seal of circumferential convergent roots make no distinction of rank, but the film bearing capacity of combination finger seal is bigger. The further study shows that the combination finger seal has the comprehensive advantages.
- boundary conditions /
- computer software /
- design /
- flow fields

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参考文献(15)

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