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| Influences of special structural parameters of spiral groove on vaporization characteristics and performance of sealing lubrication film |
| CHEN Huilong, CHEN Yingjian*, FU Yanxia, WEI Zepeng, CHENG Qian, SHI Dichao, LIU Ruirui |
| School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China |
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Abstract In order to understand the influence of helical groove shaped structural parameters on the vaporization characteristics and performance of sealing lubrication film, a sealing lubrication film vaporization calculation model involving the relationship between saturated steam pressure and temperature, viscosity temperature effect and fluid internal friction effect was established. The vaporization characteristics and sealing performance of lubrication film for spiral groove, Z-groove and goose groove seals were compared and investigated. The results show that liquid film vaporization mainly occurs in the channel weir area and the nearby dam area. The outer groove root circumferential groove of Z-groove and wild goose groove has the function of pressure storage, while the inner groove root circumferential groove of Z-groove has a cavitation inhibition effect in the groove area. The opening force of Z-groove seal is significantly higher than that of the goose groove seal and spiral groove seal, and the opening force of goose groove seal is slightly better than that of spiral groove seal. The lubrication film of Z-groove seal has the lowest degree of vaporization and smallest leakage. The opening force of the Z-groove seal reaches its maximum value when the radial deflection coefficient is 0.500-0.625 and the circumferential deflection coefficient is 0.375-0.500, but it decreases nearly linearly with the increase of helix angle. The average vapor volume fraction of lubricating film reaches its minimum value when the radial deflection coefficient is about 0.625, the circumferential deflection coefficient is about 0.375 and the helix angle is about 20°. The minimum value of leakage is obtained when the radial deflection coefficient is about 0.625 and the circumferential deflection coefficient is 0.500, but it increases nearly linearly with the increase of helix angle.
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Received: 30 March 2022
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