化工学报 ›› 2024, Vol. 75 ›› Issue (2): 604-615.DOI: 10.11949/0438-1157.20231101
朱芝1(), 许恒杰1(), 陈维1,2, 毛文元1, 邓强国1, 孙雪剑1
收稿日期:
2023-10-26
修回日期:
2024-02-01
出版日期:
2024-02-25
发布日期:
2024-04-10
通讯作者:
许恒杰
作者简介:
朱芝(1999—),女,硕士研究生,3024659512@qq.com
基金资助:
Zhi ZHU1(), Hengjie XU1(), Wei CHEN1,2, Wenyuan MAO1, Qiangguo DENG1, Xuejian SUN1
Received:
2023-10-26
Revised:
2024-02-01
Online:
2024-02-25
Published:
2024-04-10
Contact:
Hengjie XU
摘要:
在密封稳定运行的前提下,促成密封端面出口形成阻塞流动以提升气膜开启力、降低端面泄漏不失为干气密封性能优化的有效途径。以超临界二氧化碳(CO2)螺旋槽干气密封为研究对象,综合考虑实际气体、离心惯性、湍流和阻塞流效应,采用有限差分法耦合求解压力和温度控制方程,定性研究了热流耦合润滑下的临界阻塞特性(临界阻塞进口压力po_cir、临界阻塞转速N_cir、临界阻塞膜厚h0_cir和阻塞临界失稳膜厚hsc)。结果表明:等温流动和绝热流动模型下超临界CO2干气密封端面间隙出口均存在阻塞发生工况区间,进口压力、膜厚、转速对应的阻塞发生区间分别为po>po_cir、h0_cir<h0<hsc和N<N_cir;转速升高可以对临界阻塞进口压力和临界阻塞膜厚产生持续增强作用,增大膜厚则会导致临界阻塞压力降低、临界阻塞转速上升,高压进口将使阻塞零刚度对应的膜厚(阻塞临界失稳膜厚hsc)下行;相较于等温流动假设,气膜热效应对超临界CO2干气密封临界阻塞特性参数的影响程度较为显著,且影响规律各有不同。
中图分类号:
朱芝, 许恒杰, 陈维, 毛文元, 邓强国, 孙雪剑. 超临界二氧化碳螺旋槽干气密封热流耦合润滑临界阻塞特性研究[J]. 化工学报, 2024, 75(2): 604-615.
Zhi ZHU, Hengjie XU, Wei CHEN, Wenyuan MAO, Qiangguo DENG, Xuejian SUN. Study on critical chocked characteristics of supercritical carbon dioxide spiral groove dry gas seal under thermal-fluid coupling lubrication[J]. CIESC Journal, 2024, 75(2): 604-615.
参数 | 数值 | 参数 | 数值 |
---|---|---|---|
内径ri/mm | 30 | 槽宽比δ | 1 |
槽根半径rg/mm | 33.6 | 密封腔温度To/K | 450 |
外径ro/mm | 42 | 环境压力pi/MPa | 1.4 |
槽数Ng | 12 | 进口压力po/MPa | 10 |
非槽区膜厚h0/μm | 5 | 转速N/(r·min-1) | 10380.8 |
槽深hg/μm | 5 | 热导率λo/(W·m-1·K-1) | 33.917 |
螺旋角β/(°) | 15 | Prandtl数Pr | 0.83973 |
表1 干气密封计算参数
Table 1 Calculation parameters of dry gas seal
参数 | 数值 | 参数 | 数值 |
---|---|---|---|
内径ri/mm | 30 | 槽宽比δ | 1 |
槽根半径rg/mm | 33.6 | 密封腔温度To/K | 450 |
外径ro/mm | 42 | 环境压力pi/MPa | 1.4 |
槽数Ng | 12 | 进口压力po/MPa | 10 |
非槽区膜厚h0/μm | 5 | 转速N/(r·min-1) | 10380.8 |
槽深hg/μm | 5 | 热导率λo/(W·m-1·K-1) | 33.917 |
螺旋角β/(°) | 15 | Prandtl数Pr | 0.83973 |
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